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diff --git a/Cargo.toml b/Cargo.toml
index c81d358..986a96f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,44 +1,38 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 # Cargo.toml
 #
-# Project metadata and dependencies for the Noctua document viewer.
+# Noctua COSMIC desktop application
 
 [package]
 name = "noctua"
 version = "0.1.0"
-edition = "2024"
-description = "A wise document and image viewer for the COSMIC™ desktop"
+edition = "2021"
+description = "Noctua – a document viewer for the COSMIC™ desktop"
 repository = "https://codeberg.org/wfx/noctua"
 authors = ["Wolfgang Morawetz <wfx@mailbox.org>"]
 license = "GPL-3.0-or-later"
-keywords = ["document", "image", "viewer", "pdf", "cosmic"]
-categories = ["gui", "multimedia::graphics", "multimedia::images"]
 
 [features]
 default = ["image", "vector", "portable"]
 image = ["dep:image", "dep:kamadak-exif"]
 vector = ["dep:resvg"]
-portable = ["dep:poppler", "dep:cairo-rs"]
+portable = ["dep:pdfium-render"]
 full = ["image", "vector", "portable"]
 
 [dependencies]
-# Error handling
-anyhow = "1"
+# Serialization
+serde = { version = "1", features = ["derive"] }
+ron = "0.8"
 
-# Feature-gated dependencies
-kamadak-exif = { version = "0.5.5", optional = true }
-image = { version = "0.25.9", optional = true }
-poppler = { version = "0.4", features = ["render"], optional = true }
-cairo-rs = { version = "0.18", features = ["png"], optional = true }
+# Feature-gated document backends
+image = { version = "0.25", optional = true }
+kamadak-exif = { version = "0.5", optional = true }
+pdfium-render = { version = "0.8", optional = true }
 resvg = { version = "0.45", optional = true }
 
-# Async / concurrency
-futures-util = "0.3.31"
-tokio = { version = "1.48.0", features = ["full"] }
-
 # Logging
-log = "0.4.20"
-simple_logger = "4.2.0"
+log = "0.4"
+env_logger = "0.11"
 
 # i18n / localization
 i18n-embed = { version = "0.16", features = [
@@ -47,41 +41,35 @@ i18n-embed = { version = "0.16", features = [
 ] }
 i18n-embed-fl = "0.10"
 
-# Misc utilities
-open = "5.3.2"
-rust-embed = "8.8.0"
-dirs = "5.0"
-sha2 = "0.10"
-clap = { version = "4.5.54", features = ["derive"] }
-env_logger = "0.11.8"
-wallpaper = "3.2"
+# Resource embedding
+rust-embed = "8"
 
-[dependencies.libcosmic]
-git = "https://github.com/pop-os/libcosmic.git"
-# See https://github.com/pop-os/libcosmic/blob/master/Cargo.toml for available features.
+# Open files/URLs with the system default application
+open = "5"
+
+# Thumbnail cache (freedesktop.org spec)
+dirs = "5.0"
+md5 = "0.7"
+png = "0.17"
+
+# CLI argument parsing
+clap = { version = "4", features = ["derive"] }
+
+# Async runtime (required by libcosmic)
+tokio = { version = "1", features = ["rt", "rt-multi-thread", "macros"] }
+
+[dependencies.cosmic]
+package = "libcosmic-yoda"
+path = "../libcosmic"
+default-features = false
 features = [
-    # Accessibility support
     "a11y",
-    # About widget for the app
     "about",
-    # Uses cosmic-settings-daemon to watch for config file changes
     "dbus-config",
-    # Support creating additional application windows.
     "multi-window",
-    # On app startup, focuses an existing instance if the app is already open
     "single-instance",
-    # Uses tokio as the executor for the runtime
     "tokio",
-    # Windowing support for X11, Windows, Mac, & Redox
     "winit",
-    # Add Wayland support to winit
     "wayland",
-    # GPU-accelerated rendering
     "wgpu",
 ]
-
-# Uncomment to test a locally-cloned libcosmic
-[patch.'https://github.com/pop-os/libcosmic']
-libcosmic-yoda = { path = "../libcosmic" }
-cosmic-config = { path = "../libcosmic/cosmic-config" }
-cosmic-theme = { path = "../libcosmic/cosmic-theme" }
diff --git a/README.md b/README.md
deleted file mode 100644
index b5f4c3e..0000000
--- a/README.md
+++ /dev/null
@@ -1,2 +0,0 @@
-# noctua
-
diff --git a/docs/features.md b/docs/features.md
deleted file mode 100644
index 5cd123e..0000000
--- a/docs/features.md
+++ /dev/null
@@ -1,202 +0,0 @@
-# Noctua Features
-
-This document describes the implemented and planned features of Noctua, a modern image viewer for the COSMIC desktop environment.
-
-## Current Features
-
-### Document Support
-
-#### Raster Images (Implemented)
-- **Formats**: PNG, JPEG, GIF, BMP, TIFF, WebP, and all formats supported by `image-rs`
-- **Capabilities**:
-  - Full pixel-perfect rendering at 100% zoom
-  - Lossless transformations (rotate, flip)
-  - Real-time transformation preview
-  - EXIF metadata extraction
-
-#### Vector Graphics (Implemented)
-- **Formats**: SVG
-- **Rendering**: High-quality rendering via `resvg` library
-- **Capabilities**:
-  - Scalable display at any zoom level without quality loss
-  - Transformations (rotate, flip)
-
-#### Portable Documents (Implemented)
-- **Formats**: PDF
-- **Rendering**: Full PDF rendering via poppler library
-- **Multi-page navigation**: Browse through all pages of a document
-- **Page thumbnails**: Left sidebar shows page previews (generated on demand)
-- **Transformations**: Rotate and flip on rendered pages
-
-### Navigation
-
-#### Folder Navigation (Implemented)
-- **Automatic folder scanning**: When opening an image, all supported images in the same folder are indexed
-- **Quick navigation**:
-  - Arrow keys (Left/Right) to navigate between images
-  - Footer displays current position (e.g., "3 / 42")
-  - Seamless transitions between images
-
-#### File Opening (Implemented)
-- **Command-line arguments**: Open images directly from terminal
-- **Default directory**: Configurable starting location (defaults to XDG Pictures)
-- File dialog not yet implemented
-
-### View Controls
-
-#### Zoom (Implemented)
-- **Mouse wheel**: Zoom in/out centered on cursor position
-- **Keyboard shortcuts**:
-  - `+` or `=` - Zoom in
-  - `-` - Zoom out
-  - `1` - Reset to 100% (Actual Size)
-  - `f` - Fit to window
-- **View modes**:
-  - **Fit**: Automatically scales image to fit window while preserving aspect ratio
-  - **Actual Size**: Displays image at 100% (1:1 pixel mapping)
-  - **Custom**: Any zoom level from 10% to 2000%
-- **Footer display**: Real-time zoom percentage or "Fit" indicator
-
-#### Pan (Implemented)
-- **Mouse drag**: Click and drag to pan around zoomed images
-- **Keyboard shortcuts**: `Ctrl + Arrow Keys` for precise panning
-- **Smart boundaries**: Pan is automatically limited to image boundaries
-- **Auto-center**: Images smaller than viewport are automatically centered
-
-#### Bidirectional State Sync (Implemented)
-- Mouse interactions update keyboard/button controls
-- Keyboard/button controls update mouse interaction state
-- No conflicts between input methods
-
-### Transformations
-
-#### Image Manipulation (Implemented)
-- **Rotate**:
-  - `r` - Rotate 90° clockwise
-  - `Shift + r` - Rotate 90° counter-clockwise
-  - Toolbar buttons available
-- **Flip**:
-  - `h` - Flip horizontally (mirror)
-  - `v` - Flip vertically
-  - Toolbar buttons available
-- **Lossless operations**: All transformations preserve original image quality
-- **Real-time preview**: Changes are immediately visible
-
-### User Interface
-
-#### COSMIC Integration (Implemented)
-- **Native COSMIC design**: Follows COSMIC desktop design language
-- **Theme support**: Automatically adapts to system light/dark theme
-- **Header toolbar**:
-  - Left: Navigation controls (Previous/Next) and panel toggle
-  - Center: Transformation buttons (Rotate, Flip) - horizontally centered
-  - Right: Information panel toggle
-- **Footer bar**:
-  - Zoom controls with buttons
-  - Current zoom level display
-  - Image dimensions
-  - Navigation position counter
-
-#### Panels (Implemented)
-- **Properties panel**:
-  - Image metadata display
-  - File information
-  - Action buttons:
-    - Set as Wallpaper (works with COSMIC, GNOME, KDE, XFCE, and tiling WMs)
-    - Open With… (planned)
-    - Show in Folder (planned)
-  - Toggle with `i` key or toolbar button
-- **Navigation panel** (Left sidebar):
-  - Toggle with `n` key or toolbar button
-  - For multi-page documents (PDF): Shows page thumbnails
-  - Click to navigate to specific page
-
-#### Keyboard Shortcuts (Implemented)
-Full keyboard-driven workflow:
-- Navigation: `←` `→`
-- Zoom: `+` `-` `1` `f`
-- Pan: `Ctrl + ←` `Ctrl + →` `Ctrl + ↑` `Ctrl + ↓`
-- Transform: `r` `Shift+r` `h` `v`
-- Panels: `i` `n`
-- Actions: `w` (Set as Wallpaper)
-
-### Desktop Integration
-
-#### Wallpaper Support (Implemented)
-- **Set as Wallpaper**: One-click wallpaper setting with cross-desktop compatibility
-- **Supported desktop environments**:
-  - COSMIC Desktop (direct config file integration)
-  - GNOME (via gsettings)
-  - KDE Plasma (via wallpaper crate)
-  - XFCE (via wallpaper crate)
-  - Tiling window managers (via feh)
-- **Multiple access methods**:
-  - Keyboard shortcut: `w`
-  - Icon button in Properties panel
-  - Tooltip support for discoverability
-- **Automatic fallback**: Tries multiple methods until one succeeds
-
-### Configuration
-
-#### Persistent Settings (Implemented)
-- **Panel states**: Remembers which panels were open
-- **Default directory**: Customizable starting location
-- **Settings location**: `~/.config/noctua/config.toml`
-
-### Technical Features
-
-#### Architecture (Implemented)
-- **Clean separation**: View layer agnostic to document format
-- **Polymorphic documents**: Single `DocumentContent` interface for all formats
-- **Efficient rendering**: Leverages COSMIC's iced renderer
-- **Type-safe transformations**: Compile-time guarantees for image operations
-
-#### Performance (Implemented)
-- **Lazy loading**: Images loaded on-demand
-- **Efficient folder scanning**: Fast directory traversal
-- **Minimal memory footprint**: Only active document kept in memory
-- **Smooth zooming**: Hardware-accelerated rendering
-
-## Planned Features
-
-### High Priority
-
-#### File Operations
-- File dialog integration (OpenPath message prepared)
-- Save transformed images
-- Copy/Move/Delete operations
-- Drag-and-drop support
-
-### Medium Priority
-
-#### Multi-format TIFF Support
-- Multi-page TIFF navigation (infrastructure ready)
-- Page thumbnails for TIFF (same as PDF)
-
-#### Metadata Editing
-- EXIF data modification
-- Comment annotations
-- Tag management
-
-### Low Priority
-
-#### Advanced Editing
-- Crop tool (message prepared)
-- Scale/Resize tool (message prepared)
-- Basic color adjustments (brightness, contrast)
-
-#### Enhanced Navigation
-- Grid view for folder contents
-- Quick jump to file
-
-#### Slideshow Mode
-- Auto-advance timer
-- Configurable intervals
-- Fullscreen support
-
-## Feature Status Legend
-
-- **Implemented**: Fully functional and tested
-- **Planned**: Design complete, implementation pending
-- **Partial**: Basic functionality exists, enhancements needed
-- **In Progress**: Currently being developed
diff --git a/docs/images/screenshot.png b/docs/images/screenshot.png
deleted file mode 100644
index 3a374f4..0000000
Binary files a/docs/images/screenshot.png and /dev/null differ
diff --git a/docs/usage.md b/docs/usage.md
deleted file mode 100644
index 72d032b..0000000
--- a/docs/usage.md
+++ /dev/null
@@ -1,193 +0,0 @@
-# Usage Guide
-
-Noctua is a modern image viewer for the COSMIC desktop environment with full keyboard support.
-
-## Opening Images
-
-### Command Line
-Open an image directly from the terminal:
-```bash
-noctua /path/to/image.png
-```
-
-When you open an image, Noctua automatically scans the folder and indexes all supported images for quick navigation.
-
-### Supported Formats
-- **Raster Images**: PNG, JPEG, GIF, BMP, TIFF, WebP, and all formats supported by `image-rs`
-- **Vector Graphics**: SVG (with scalable rendering)
-- **Portable Documents**: PDF (with multi-page navigation and thumbnails)
-
-## Keyboard Shortcuts
-
-All keyboard shortcuts are case-insensitive unless otherwise noted.
-
-### Navigation
-
-| Key   | Action            | Description                                    |
-|:------|:------------------|:-----------------------------------------------|
-| `←`   | Previous image    | Navigate to the previous image in the folder   |
-| `→`   | Next image        | Navigate to the next image in the folder       |
-
-The footer shows your current position (e.g., "3 / 42").
-
-For multi-page documents (PDF):
-- Click thumbnails in the left sidebar to jump to a specific page
-- Use `←` `→` to navigate between pages
-
-### Zoom and View
-
-| Key       | Action                     | Description                                           |
-|:----------|:---------------------------|:------------------------------------------------------|
-| `+` / `=` | Zoom in                    | Increase zoom by 10%                                  |
-| `-`       | Zoom out                   | Decrease zoom by ~9%                                  |
-| `1`       | Actual size (100%)         | Display image at pixel-perfect 1:1 scale              |
-| `f`       | Fit to window              | Scale image to fit the window while preserving ratio  |
-
-You can also zoom with the **mouse wheel** - the zoom centers on your cursor position.
-
-The current zoom level is displayed in the footer (e.g., "150%" or "Fit").
-
-### Pan
-
-Pan controls allow you to move around zoomed images:
-
-| Key        | Action             | Description                              |
-|:-----------|:-------------------|:-----------------------------------------|
-| `Ctrl + ←` | Pan left           | Move view to the left                    |
-| `Ctrl + →` | Pan right          | Move view to the right                   |
-| `Ctrl + ↑` | Pan up             | Move view upward                         |
-| `Ctrl + ↓` | Pan down           | Move view downward                       |
-| `0`        | Reset pan          | Center the image                         |
-
-You can also **click and drag** with the mouse to pan around zoomed images.
-
-### Transformations
-
-| Key         | Action                         | Description                               |
-|:------------|:-------------------------------|:------------------------------------------|
-| `h`         | Flip horizontal                | Mirror the image horizontally             |
-| `v`         | Flip vertical                  | Flip the image upside down                |
-| `r`         | Rotate clockwise               | Rotate 90° clockwise                      |
-| `Shift + r` | Rotate counter-clockwise       | Rotate 90° counter-clockwise              |
-
-All transformations are lossless and show in real-time.
-
-### Panels and UI
-
-| Key | Action                 | Description                              |
-|:----|:-----------------------|:-----------------------------------------|
-| `i` | Toggle properties      | Show/hide the properties panel (metadata)|
-| `n` | Toggle navigation      | Show/hide the navigation sidebar         |
-
-For multi-page documents (PDF), the navigation sidebar displays page thumbnails.
-Click on a thumbnail to jump to that page.
-
-### Actions
-
-| Key | Action                 | Description                              |
-|:----|:-----------------------|:-----------------------------------------|
-| `w` | Set as wallpaper       | Set the current image as desktop wallpaper|
-
-## Mouse Controls
-
-### Zoom
-- **Mouse wheel up/down**: Zoom in/out centered on cursor
-- **Footer buttons**: Click zoom in/out buttons for step-by-step control
-
-### Pan
-- **Click and drag**: Pan around zoomed images
-- Hold and drag anywhere on the image to move the view
-
-### Navigation
-- **Footer navigation**: Use Previous/Next buttons to browse images
-
-## Toolbar
-
-The header toolbar provides quick access to common operations:
-
-### Left Side
-- **Navigation toggle**: Show/hide the sidebar
-- **Previous/Next buttons**: Navigate between images in the folder
-
-### Center (Horizontally Centered)
-- **Rotate buttons**: Rotate clockwise or counter-clockwise
-- **Flip buttons**: Flip horizontally or vertically
-
-### Right Side
-- **Properties toggle**: Show/hide the metadata panel
-
-## Properties Panel
-
-The properties panel (toggle with `i`) displays image metadata and provides quick actions:
-
-### Action Buttons
-Located at the top-right of the properties panel:
-
-- **Set as Wallpaper** (`w` key): Set the current image as your desktop wallpaper
-  - Works with COSMIC, GNOME, KDE, XFCE, and tiling window managers
-  - Automatically detects your desktop environment
-  - Falls back to alternative methods if the primary method fails
-  
-- **Open With** (planned): Open the image with another application
-
-- **Show in Folder** (planned): Open the containing folder in your file manager
-
-### Metadata Display
-- **File Information**: Name, format, dimensions, file size, color type
-- **Camera Information** (if available): Camera model, date taken, exposure settings, GPS location
-
-## Footer Information
-
-The footer displays useful information:
-- **Zoom controls**: Zoom out, current zoom level, zoom in, fit buttons
-- **Image dimensions**: Width × Height in pixels
-- **Navigation position**: Current image / Total images in folder
-
-For PDFs, it also shows the current page number.
-
-## Tips and Tricks
-
-### Keyboard-Driven Workflow
-Noctua is designed for efficient keyboard use:
-1. Open an image from terminal
-2. Use `←` `→` to browse through the folder
-3. Press `r` to rotate, `h` or `v` to flip
-4. Use `+` `-` to zoom, `Ctrl + arrows` to pan
-5. Press `i` to check metadata
-
-### Zoom and Pan Together
-- Zoom with mouse wheel while hovering over the area you want to examine
-- The zoom centers on your cursor, making it easy to focus on details
-- Once zoomed, drag with mouse or use `Ctrl + arrows` to navigate
-
-### Bidirectional Controls
-Mouse and keyboard work together seamlessly:
-- Zoom with keyboard, pan with mouse
-- Zoom with mouse wheel, the footer updates automatically
-- Pan with keyboard, continue with mouse drag
-
-## Configuration
-
-Settings are stored in `~/.config/cosmic/org.codeberg.wfx.Noctua/v1/`.
-
-### Configurable Options
-- **Default directory**: Set your preferred starting location
-- **Panel states**: Your panel preferences are remembered between sessions
-
-## Planned Features
-
-The following features are prepared in code but not yet implemented:
-
-### File Operations
-- File open dialog
-- Save transformed images
-- (Copy/Move/)Delete operations
-
-### Document Support
-- SVG rendering (implemented)
-
-### Advanced Editing
-- Crop mode (`c` key prepared)
-- Scale/Resize mode (`s` key prepared)
-
-See [features.md](features.md) for a complete list of planned features.
diff --git a/i18n/cs/noctua.ftl b/i18n/cs/noctua.ftl
deleted file mode 100644
index 7ab4e97..0000000
--- a/i18n/cs/noctua.ftl
+++ /dev/null
@@ -1,121 +0,0 @@
-# SPDX-License-Identifier: GPL-3.0-or-later
-# i18n/en/noctua.ftl
-#
-# Localization strings for Noctua (English).
-# Usage: fl!("message-id", arg1, arg2, ...)
-#
-# Positional arguments ($1, $2, ...) are used for variable content.
-
-
-## Application
-noctua-app-name = Noctua
-noctua-app-description = Prohlížeč dokumentů a obrázků pro prostředí COSMIC
-
-
-## Main window
-window-title = { $filename ->
-    [none] Noctua
-   *[some] { $filename } — Noctua
-}
-
-
-## Menu entries
-menu-file-open = Otevřít…
-menu-file-quit = Ukončit
-menu-view-zoom-in = Přiblížit
-menu-view-zoom-out = Oddálit
-menu-view-zoom-reset = Obnovit přiblížení
-menu-view-zoom-fit = Přizpůsobit oknu
-menu-view-flip-horizontal = Překlopit vodorovně
-menu-view-flip-vertical = Překlopit svisle
-menu-view-rotate-cw = Otočit po směru hodinových ručiček
-menu-view-rotate-ccw = Otočit proti směru hodinových ručiček
-
-
-## Tooltips (for buttons and icons)
-tooltip-nav-previous = Předchozí dokument
-tooltip-nav-next = Další dokument
-tooltip-nav-toggle = Přepnout navigační panel
-tooltip-zoom-in = Přiblížit
-tooltip-zoom-out = Oddálit
-tooltip-zoom-fit = Přizpůsobit oknu
-tooltip-rotate-ccw = Otočit proti směru hodinových ručiček
-tooltip-rotate-cw = Otočit po směru hodinových ručiček
-tooltip-flip-horizontal = Překlopit vodorovně
-tooltip-flip-vertical = Překlopit svisle
-tooltip-info-panel = Přepnout informační panel
-
-
-## Footer / Status bar
-status-zoom-fit = Přizpůsobit
-status-zoom-percent = { $percent }%
-status-doc-dimensions = { $width } × { $height }
-status-nav-position = { $current } / { $total }
-status-separator =  | 
-
-
-## Placeholders / Empty states
-no-document = Není načten žádný dokument
-
-
-## Labels
-label-zoom = Přiblížení
-label-tools = Nástroje
-label-crop = Oříznout
-label-scale = Měřítko
-label-page = Stránka
-label-pages = Stránky
-
-
-## Loading states
-loading-metadata = Načítání metadat…
-loading-thumbnails = Načítání { $current } / { $total }…
-
-
-## Error messages
-error-failed-to-open = Nepodařilo se otevřít „{ $path }“
-error-unsupported-format = Nepodporovaný formát souboru
-error-no-image-loaded = Není načten žádný obrázek
-
-
-## Properties panel
-panel-properties = Vlastnosti
-panel-actions = Akce
-
-meta-section-file = Informace o souboru
-meta-section-exif = Informace o kameře
-meta-section-image = Informace o obrázku
-
-## File metadata
-meta-filename = Název
-meta-format = Formát
-meta-dimensions = Rozměry
-meta-filesize = Velikost
-meta-colortype = Typ barev
-meta-path = Cesta
-meta-pages = Stránky
-meta-current-page = Aktuální stránka
-
-## Image metadata
-meta-width = Šířka
-meta-height = Výška
-meta-depth = Bitová hloubka
-
-## EXIF metadata
-meta-camera = Kamera
-meta-datetime = Datum pořízení
-meta-exposure = Expozice
-meta-aperture = Clona
-meta-iso = ISO { $iso }
-meta-focal = Ohnisková vzdálenost
-meta-gps = Poloha GPS
-
-## Action buttons
-action-set-wallpaper = Nastavit jako tapetu
-action-open-with = Otevřít pomocí…
-action-show-in-folder = Zobrazit ve složce
-
-
-## Navigation panel (thumbnails)
-nav-panel-title = Stránky
-nav-panel-loading = Načítání { $current } / { $total }…
diff --git a/i18n/en/noctua.ftl b/i18n/en/noctua.ftl
index 3b51c8b..fb33b6a 100644
--- a/i18n/en/noctua.ftl
+++ b/i18n/en/noctua.ftl
@@ -33,20 +33,6 @@ menu-view-rotate-cw = Rotate Clockwise
 menu-view-rotate-ccw = Rotate Counter-Clockwise
 
 
-## Tooltips (for buttons and icons)
-tooltip-nav-previous = Previous document
-tooltip-nav-next = Next document
-tooltip-nav-toggle = Toggle navigation panel
-tooltip-zoom-in = Zoom in
-tooltip-zoom-out = Zoom out
-tooltip-zoom-fit = Fit to window
-tooltip-rotate-ccw = Rotate counter-clockwise
-tooltip-rotate-cw = Rotate clockwise
-tooltip-flip-horizontal = Flip horizontally
-tooltip-flip-vertical = Flip vertically
-tooltip-info-panel = Toggle info panel
-
-
 ## Footer / Status bar
 status-zoom-fit = Fit
 status-zoom-percent = { $percent }%
@@ -57,6 +43,11 @@ status-separator =  |
 
 ## Placeholders / Empty states
 no-document = No document loaded
+no-document-hint = Open a document to view
+
+## Status / Info
+status-file-position = File { $current } / { $total }
+status-page-position = Page { $current } / { $total }
 
 
 ## Labels
diff --git a/i18n/sv/noctua.ftl b/i18n/sv/noctua.ftl
deleted file mode 100644
index 07fe962..0000000
--- a/i18n/sv/noctua.ftl
+++ /dev/null
@@ -1,127 +0,0 @@
-# SPDX-License-Identifier: GPL-3.0-or-later
-# i18n/sv/noctua.ftl
-#
-# Localization strings for Noctua (Swedish).
-# Usage: fl!("message-id", arg1, arg2, ...)
-#
-# Positional arguments ($1, $2, ...) are used for variable content.
-
-
-## Program
-noctua-app-name = Noctua
-noctua-app-description = En dokument och bildvisare för COSMIC skrivbordet
-
-## Main window
-window-title = { $filename ->
-    [none] Noctua
-   *[some] { $filename } — Noctua
-}
-
-
-## Menyposter
-menu-main = Meny
-menu-file-open = Öppna…
-menu-file-quit = Avsluta
-menu-view-zoom-in = Zooma in
-menu-view-zoom-out = Zooma ut
-menu-view-zoom-reset = Återställ zoom
-menu-view-zoom-fit = Anpassa till fönster
-menu-view-flip-horizontal = Vänd horisontellt
-menu-view-flip-vertical = Vänd vertikalt
-menu-view-rotate-cw = Rotera medurs
-menu-view-rotate-ccw = Rotera moturs
-
-
-## Verktygstips (för knappar och ikoner)
-tooltip-nav-previous = Föregående dokument
-tooltip-nav-next = Nästa dokument
-tooltip-nav-toggle = Växla navigeringspanel
-tooltip-zoom-in = Zooma in
-tooltip-zoom-out = Zooma ut
-tooltip-zoom-fit = Anpassa till fönster
-tooltip-rotate-ccw = Rotera moturs
-tooltip-rotate-cw = Rotera medurs
-tooltip-flip-horizontal = Vänd horisontellt
-tooltip-flip-vertical = Vänd vertikalt
-tooltip-info-panel = Växla informationspanel
-
-
-## Sidfot / Statusfält
-status-zoom-fit = Passa
-status-zoom-percent = { $percent }%
-status-doc-dimensions = { $width } × { $height }
-status-nav-position = { $current } / { $total }
-status-separator =  |
-
-
-## Platshållare / Tomma tillstånd
-no-document = Inget dokument laddat
-
-
-## Etiketter
-label-zoom = Zoom
-label-tools = Verktyg
-label-crop = Beskära
-label-scale = Skala
-label-page = Sida
-label-pages = Sidor
-
-
-## Laddningstillstånd
-loading-metadata = Laddar metadata…
-loading-thumbnails = Laddar { $current } / { $total }…
-
-
-## Felmeddelanden
-error-failed-to-open = Misslyckades att öppna "{ $path }"
-error-unsupported-format = Filformat som inte stöds
-error-no-image-loaded = Ingen bild laddad
-
-
-## Egenskapspanel
-panel-properties = Egenskaper
-panel-actions = Åtgärder
-
-meta-section-file = Fil information
-meta-section-exif = Kamera information
-meta-section-image = Bild information
-
-## Fil metadata
-meta-filename = Namn
-meta-format = Format
-meta-dimensions = Dimensioner
-meta-filesize = Storlek
-meta-colortype = Färg-typ
-meta-path = Sökväg
-meta-pages = Sidor
-meta-current-page = Nuvarande sida
-
-## Bildmetadata
-meta-width = Bredd
-meta-height = Höjd
-meta-depth = Bitdjup
-
-## EXIF metadata
-meta-camera = Kamera
-meta-datetime = Datum taget
-meta-exposure = Exponering
-meta-aperture = Bländare
-meta-iso = ISO { $iso }
-meta-focal = Brännvidd
-meta-gps = GPS plats
-
-## Åtgärdsknappar
-action-set-wallpaper = Använd som bakgrundsbild
-action-open-with = Öppna med…
-action-show-in-folder = Visa i mapp
-
-
-## Navigeringspanel (tumnaglar)
-nav-panel-title = Sidor
-nav-panel-loading = Laddar { $current } / { $total }…
-
-
-## Formatpanel
-format-section-title = Pappersformat
-format-section-subtitle = Välj pappersstorlek för export
-orientation-section-title = Orientering
diff --git a/justfile b/justfile
index c45e1e1..65263c9 100644
--- a/justfile
+++ b/justfile
@@ -1,4 +1,4 @@
-# Name of the application's binary.
+# Name of the application binary (produced by the ui crate).
 name := 'noctua'
 # The unique ID of the application.
 appid := 'org.codeberg.wfx.Noctua'
@@ -25,7 +25,7 @@ desktop-dst := base-dir / 'share' / 'applications' / desktop
 icons-dst := base-dir / 'share' / 'icons' / 'hicolor'
 icon-svg-dst := icons-dst / 'scalable' / 'apps' / icon-svg
 
-# Default recipe which runs `just build-release`
+# Default recipe
 default: build-release
 
 # Runs `cargo clean`
@@ -39,9 +39,9 @@ clean-vendor:
 # `cargo clean` and removes vendored dependencies
 clean-dist: clean clean-vendor
 
-# Compiles with debug profile
+# Compiles the entire workspace with debug profile
 build-debug *args:
-    cargo build {{args}}
+    cargo build --workspace {{args}}
 
 # Compiles with release profile
 build-release *args: (build-debug '--release' args)
@@ -49,14 +49,18 @@ build-release *args: (build-debug '--release' args)
 # Compiles release profile with vendored dependencies
 build-vendored *args: vendor-extract (build-release '--frozen --offline' args)
 
-# Runs a clippy check
+# Runs clippy on the entire workspace
 check *args:
-    cargo clippy --all-features {{args}} -- -W clippy::pedantic
+    cargo clippy --workspace --all-features {{args}} -- -W clippy::pedantic
 
-# Runs a clippy check with JSON message format
+# Runs clippy with JSON message format
 check-json: (check '--message-format=json')
 
-# Run the application for testing purposes
+# Runs tests on the entire workspace
+test *args:
+    cargo test --workspace {{args}}
+
+# Runs the application (no args = COSMIC UI, with args = CLI mode)
 run *args:
     env RUST_BACKTRACE=full cargo run --release {{args}}
 
@@ -91,10 +95,10 @@ vendor-extract:
     rm -rf vendor
     tar pxf vendor.tar
 
-# Bump cargo version, create git commit, and create tag
+# Bump version in all crates, commit and tag
 tag version:
     find -type f -name Cargo.toml -exec sed -i '0,/^version/s/^version.*/version = "{{version}}"/' '{}' \; -exec git add '{}' \;
-    cargo check
+    cargo check --workspace
     cargo clean
     git add Cargo.lock
     git commit -m 'release: {{version}}'
diff --git a/resources/org.codeberg.wfx.Noctua.desktop b/resources/org.codeberg.wfx.Noctua.desktop
index 35d5bd9..9bb2d0a 100644
--- a/resources/org.codeberg.wfx.Noctua.desktop
+++ b/resources/org.codeberg.wfx.Noctua.desktop
@@ -1,14 +1,12 @@
 [Desktop Entry]
 Name=Noctua
 Comment=A wise document and image viewer for the COSMIC™ desktop
-Comment[cs]=Chytrý prohlížeč dokumentů a obrázku pro prostředí COSMIC™
 Type=Application
 Icon=org.codeberg.wfx.Noctua
-Exec=noctua %F
+Exec=/usr/bin/noctua %F
 Terminal=false
 StartupNotify=true
 Categories=Graphics;Viewer;Utility;
 StartupWMClass=org.codeberg.wfx.Noctua
 Keywords=image;document;pdf;viewer;cosmic;
-Keywords[cs]=obrázek;dokument;pdf;prohlížeč;fotka;
-MimeType=image/png;image/jpeg;image/gif;image/webp;image/bmp;image/tiff;image/svg+xml;application/pdf;
+MimeType=image/png;image/x-png;image/jpeg;image/jpg;image/pjpeg;image/gif;image/webp;image/bmp;image/x-bmp;image/tiff;image/svg+xml;application/pdf;
diff --git a/resources/org.codeberg.wfx.Noctua.metainfo.xml b/resources/org.codeberg.wfx.Noctua.metainfo.xml
index 95b1479..ae24682 100644
--- a/resources/org.codeberg.wfx.Noctua.metainfo.xml
+++ b/resources/org.codeberg.wfx.Noctua.metainfo.xml
@@ -8,17 +8,12 @@
   <project_license>GPL-3.0-or-later</project_license>
   <name>Noctua</name>
   <summary>A wise document and image viewer for the COSMIC™ desktop</summary>
-  <summary xml:lang="cs">Chytrý prohlížeč dokumentů a obrázků pro prostředí COSMIC™</summary>
 
   <description>
     <p>
       Noctua is a lightweight, keyboard-driven viewer for images, PDFs, and vector graphics.
       Built with Rust and libcosmic, it integrates seamlessly with COSMIC™ and GTK-based desktops.
     </p>
-    <p xml:lang="cs">
-      Noctua je nenáročný prohlížeč obrázků, PDF a vektorové grafiky, snadno ovladatelný pomocí klávesnice.
-      Je napsaný v jazyce Rust a postavený na libcosmic, díky čemuž se plynule integruje s prostředím COSMIC™ a prostředími založenými na GTK.
-    </p>
   </description>
 
   <launchable type="desktop-id">org.codeberg.wfx.Noctua.desktop</launchable>
@@ -30,10 +25,14 @@
   <provides>
     <binary>noctua</binary>
     <mediatype>image/png</mediatype>
+    <mediatype>image/x-png</mediatype>
     <mediatype>image/jpeg</mediatype>
+    <mediatype>image/jpg</mediatype>
+    <mediatype>image/pjpeg</mediatype>
     <mediatype>image/gif</mediatype>
     <mediatype>image/webp</mediatype>
     <mediatype>image/bmp</mediatype>
+    <mediatype>image/x-bmp</mediatype>
     <mediatype>image/tiff</mediatype>
     <mediatype>image/svg+xml</mediatype>
     <mediatype>application/pdf</mediatype>
diff --git a/rustfmt.toml b/rustfmt.toml
deleted file mode 100644
index 51a7648..0000000
--- a/rustfmt.toml
+++ /dev/null
@@ -1,5 +0,0 @@
-# rustfmt.toml
-reorder_imports = false
-reorder_modules = false
-imports_granularity = "Preserve"
-group_imports = "Preserve"
diff --git a/src/active_state.rs b/src/active_state.rs
new file mode 100644
index 0000000..6525747
--- /dev/null
+++ b/src/active_state.rs
@@ -0,0 +1,165 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// src/active_state.rs
+//
+// Pure navigation state: tracks which session and item are currently active.
+
+use anyhow::{Context, Result};
+use uuid::Uuid;
+
+use crate::workspace::model::{Item, Session, Workspace};
+
+/// Tracks the active session and item selection.
+///
+/// `ActiveState` does not own or store a `Workspace`. All methods that need
+/// workspace data receive it as a parameter. This keeps navigation state
+/// cleanly separated from domain data.
+#[derive(Debug, Clone)]
+pub struct ActiveState {
+    active_session: Option<Uuid>,
+    active_item: Option<usize>,
+}
+
+impl Default for ActiveState {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl ActiveState {
+    #[must_use]
+    pub fn new() -> Self {
+        Self {
+            active_session: None,
+            active_item: None,
+        }
+    }
+
+    /// Clear all navigation state.
+    pub fn reset(&mut self) {
+        self.active_session = None;
+        self.active_item = None;
+    }
+
+    pub fn select_session(&mut self, workspace: &Workspace, name: &str) -> Result<()> {
+        let session = workspace.session_by_name(name)?;
+        if self.active_session == Some(session.id) {
+            return Ok(());
+        }
+        self.active_session = Some(session.id);
+        self.active_item = if session.items.is_empty() {
+            None
+        } else {
+            Some(0)
+        };
+        Ok(())
+    }
+
+    pub fn select_session_by_id(&mut self, workspace: &Workspace, id: Uuid) -> Result<()> {
+        if self.active_session == Some(id) {
+            return Ok(());
+        }
+        let session = workspace.session(id)?;
+        self.active_session = Some(session.id);
+        self.active_item = if session.items.is_empty() {
+            None
+        } else {
+            Some(0)
+        };
+        Ok(())
+    }
+
+    pub fn clear_session(&mut self) {
+        self.active_session = None;
+        self.active_item = None;
+    }
+
+    pub fn select_item(&mut self, workspace: &Workspace, index: usize) -> Result<()> {
+        let session = self.require_active_session(workspace)?;
+        if index >= session.items.len() {
+            anyhow::bail!(
+                "Item index {index} out of range (session {:?} has {} items)",
+                session.name,
+                session.items.len()
+            );
+        }
+        self.active_item = Some(index);
+        Ok(())
+    }
+
+    pub fn next_item(&mut self, workspace: &Workspace) {
+        let count = self.item_count(workspace);
+        if let Some(idx) = self.active_item {
+            if idx + 1 < count {
+                self.active_item = Some(idx + 1);
+            }
+        }
+    }
+
+    pub fn previous_item(&mut self) {
+        if let Some(idx) = self.active_item {
+            if idx > 0 {
+                self.active_item = Some(idx - 1);
+            }
+        }
+    }
+
+    /// Adjust the item cursor after an item was removed from the active session.
+    pub fn adjust_after_remove(&mut self, workspace: &Workspace) {
+        let count = self.item_count(workspace);
+        self.active_item = if count == 0 {
+            None
+        } else {
+            Some(self.active_item.unwrap_or(0).min(count - 1))
+        };
+    }
+
+    /// Point the item cursor to the last item in the active session.
+    pub fn select_last_item(&mut self, workspace: &Workspace) {
+        let count = self.item_count(workspace);
+        self.active_item = if count == 0 { None } else { Some(count - 1) };
+    }
+
+    // -- Read-only accessors --
+
+    #[must_use]
+    pub fn active_session_id(&self) -> Option<Uuid> {
+        self.active_session
+    }
+
+    #[must_use]
+    pub fn active_item_index(&self) -> Option<usize> {
+        self.active_item
+    }
+
+    /// Returns the active session from the workspace.
+    #[must_use]
+    pub fn active_session<'a>(&self, workspace: &'a Workspace) -> Option<&'a Session> {
+        let id = self.active_session?;
+        workspace.session(id).ok()
+    }
+
+    /// Returns the active item from the active session.
+    #[must_use]
+    pub fn active_item<'a>(&self, workspace: &'a Workspace) -> Option<&'a Item> {
+        let session = self.active_session(workspace)?;
+        let idx = self.active_item?;
+        session.items.get(idx)
+    }
+
+    /// Returns the UUID of the active item.
+    #[must_use]
+    pub fn active_item_id(&self, workspace: &Workspace) -> Option<Uuid> {
+        self.active_item(workspace).map(|i| i.id)
+    }
+
+    // Private helpers
+
+    fn require_active_session<'a>(&self, workspace: &'a Workspace) -> Result<&'a Session> {
+        let id = self.active_session.context("No active session")?;
+        workspace.session(id)
+    }
+
+    fn item_count(&self, workspace: &Workspace) -> usize {
+        self.active_session(workspace).map_or(0, |s| s.items.len())
+    }
+}
diff --git a/src/application/commands/crop_document.rs b/src/application/commands/crop_document.rs
deleted file mode 100644
index 2d2f408..0000000
--- a/src/application/commands/crop_document.rs
+++ /dev/null
@@ -1,228 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/application/commands/crop_document.rs
-//
-// Crop document command: crop the current document to a specified region.
-
-use cosmic::iced::{ContentFit, Size, Vector};
-
-use crate::application::DocumentManager;
-use crate::domain::document::core::content::DocumentKind;
-use crate::domain::document::core::document::DocResult;
-use crate::domain::document::operations::CropRegion;
-
-/// Crop document command.
-///
-/// Crops the current document to the specified rectangular region.
-/// The coordinates are in image pixels (not canvas/screen coordinates).
-pub struct CropDocumentCommand {
-    /// X coordinate of the crop region (top-left corner).
-    pub x: u32,
-    /// Y coordinate of the crop region (top-left corner).
-    pub y: u32,
-    /// Width of the crop region in pixels.
-    pub width: u32,
-    /// Height of the crop region in pixels.
-    pub height: u32,
-}
-
-impl CropDocumentCommand {
-    /// Create a new crop document command.
-    #[must_use]
-    pub fn new(x: u32, y: u32, width: u32, height: u32) -> Self {
-        Self {
-            x,
-            y,
-            width,
-            height,
-        }
-    }
-
-    /// Create a crop command from canvas coordinates.
-    ///
-    /// Converts canvas-space coordinates to image-space pixels based on
-    /// the current view state (scale, pan, content fit).
-    ///
-    /// # Errors
-    ///
-    /// Returns an error if the crop region is invalid or outside image bounds.
-    pub fn from_canvas_selection(
-        crop_region: &CropRegion,
-        canvas_size: Size,
-        image_size: Size,
-        scale: f32,
-        pan_offset: Vector,
-    ) -> Result<Self, String> {
-        let (x, y, w, h) = crop_region.as_tuple();
-        let canvas_rect = (x as f32, y as f32, w as f32, h as f32);
-
-        // Convert canvas coordinates to image pixel coordinates
-        let image_rect = Self::canvas_rect_to_image_rect(
-            canvas_rect,
-            canvas_size,
-            image_size,
-            scale,
-            pan_offset,
-            ContentFit::Contain,
-        )
-        .ok_or_else(|| "Invalid crop region".to_string())?;
-
-        Ok(Self {
-            x: image_rect.0,
-            y: image_rect.1,
-            width: image_rect.2,
-            height: image_rect.3,
-        })
-    }
-
-    /// Convert canvas rectangle to image pixel rectangle.
-    ///
-    /// This is the core coordinate transformation logic that maps from
-    /// canvas/screen coordinates to actual image pixel coordinates.
-    fn canvas_rect_to_image_rect(
-        canvas_rect: (f32, f32, f32, f32),
-        canvas_size: Size,
-        image_size: Size,
-        scale: f32,
-        offset: Vector,
-        content_fit: ContentFit,
-    ) -> Option<(u32, u32, u32, u32)> {
-        let (cx, cy, cw, ch) = canvas_rect;
-
-        if cw <= 1.0 || ch <= 1.0 {
-            return None;
-        }
-
-        // Transform top-left and bottom-right corners
-        let (x1, y1) = Self::canvas_to_image_coords(
-            cx,
-            cy,
-            canvas_size,
-            image_size,
-            scale,
-            offset,
-            content_fit,
-        );
-        let (x2, y2) = Self::canvas_to_image_coords(
-            cx + cw,
-            cy + ch,
-            canvas_size,
-            image_size,
-            scale,
-            offset,
-            content_fit,
-        );
-
-        // Clamp to image boundaries
-        let img_x = x1.max(0.0).min(image_size.width);
-        let img_y = y1.max(0.0).min(image_size.height);
-        let img_w = (x2 - x1).max(1.0).min(image_size.width - img_x);
-        let img_h = (y2 - y1).max(1.0).min(image_size.height - img_y);
-
-        #[allow(clippy::cast_possible_truncation, clippy::cast_sign_loss)]
-        Some((
-            img_x.round() as u32,
-            img_y.round() as u32,
-            img_w.round() as u32,
-            img_h.round() as u32,
-        ))
-    }
-
-    /// Convert a single point from canvas coordinates to image coordinates.
-    fn canvas_to_image_coords(
-        cx: f32,
-        cy: f32,
-        canvas_size: Size,
-        image_size: Size,
-        scale: f32,
-        offset: Vector,
-        content_fit: ContentFit,
-    ) -> (f32, f32) {
-        // Calculate displayed image dimensions based on ContentFit
-        let (display_w, display_h) = match content_fit {
-            ContentFit::Contain => {
-                let aspect = image_size.width / image_size.height;
-                let canvas_aspect = canvas_size.width / canvas_size.height;
-
-                if aspect > canvas_aspect {
-                    // Limited by width
-                    (canvas_size.width, canvas_size.width / aspect)
-                } else {
-                    // Limited by height
-                    (canvas_size.height * aspect, canvas_size.height)
-                }
-            }
-            _ => (image_size.width, image_size.height),
-        };
-
-        // Apply scale
-        let scaled_w = display_w * scale;
-        let scaled_h = display_h * scale;
-
-        // Center in canvas
-        let center_x = (canvas_size.width - scaled_w) / 2.0;
-        let center_y = (canvas_size.height - scaled_h) / 2.0;
-
-        // Convert canvas coords to scaled image coords
-        let img_x = (cx - center_x - offset.x) / scale;
-        let img_y = (cy - center_y - offset.y) / scale;
-
-        // Scale from display space to actual image pixel space
-        let pixel_x = (img_x / display_w) * image_size.width;
-        let pixel_y = (img_y / display_h) * image_size.height;
-
-        (pixel_x, pixel_y)
-    }
-
-    /// Execute the crop command on the document manager.
-    ///
-    /// # Errors
-    ///
-    /// Returns an error if:
-    /// - No document is currently open
-    /// - The document type doesn't support cropping
-    /// - The crop region is invalid
-    /// - The crop operation fails
-    pub fn execute(&self, manager: &mut DocumentManager) -> DocResult<()> {
-        let doc = manager
-            .current_document_mut()
-            .ok_or_else(|| anyhow::anyhow!("No document open"))?;
-
-        // Only raster images support cropping
-        if doc.kind() != DocumentKind::Raster {
-            return Err(anyhow::anyhow!(
-                "Crop operation is only supported for raster images"
-            ));
-        }
-
-        // Get the raster document and apply crop
-        if let crate::domain::document::core::content::DocumentContent::Raster(raster) = doc {
-            raster
-                .crop(self.x, self.y, self.width, self.height)
-                .map_err(|e| anyhow::anyhow!("Crop failed: {}", e))?;
-        }
-
-        Ok(())
-    }
-
-    /// Check if the command can be executed.
-    #[must_use]
-    pub fn can_execute(&self, manager: &DocumentManager) -> bool {
-        manager
-            .current_document()
-            .map_or(false, |doc| doc.kind() == DocumentKind::Raster)
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_command_creation() {
-        let cmd = CropDocumentCommand::new(10, 20, 100, 150);
-        assert_eq!(cmd.x, 10);
-        assert_eq!(cmd.y, 20);
-        assert_eq!(cmd.width, 100);
-        assert_eq!(cmd.height, 150);
-    }
-}
diff --git a/src/application/commands/mod.rs b/src/application/commands/mod.rs
deleted file mode 100644
index c6ab7bd..0000000
--- a/src/application/commands/mod.rs
+++ /dev/null
@@ -1,10 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/application/commands/mod.rs
-//
-// Application commands: document operations and navigation.
-
-pub mod crop_document;
-pub mod navigate;
-pub mod open_document;
-pub mod save_document;
-pub mod transform_document;
diff --git a/src/application/commands/navigate.rs b/src/application/commands/navigate.rs
deleted file mode 100644
index c46cac3..0000000
--- a/src/application/commands/navigate.rs
+++ /dev/null
@@ -1,67 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/application/commands/navigate.rs
-//
-// Navigation command: next/previous document.
-// Reserved for future CQRS pattern - currently using direct DocumentManager methods.
-
-#![allow(dead_code)]
-
-use std::path::PathBuf;
-
-use crate::application::document_manager::DocumentManager;
-use crate::domain::document::core::document::DocResult;
-
-/// Navigation direction.
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub enum NavigationDirection {
-    /// Navigate to next document.
-    Next,
-    /// Navigate to previous document.
-    Previous,
-}
-
-/// Navigate command.
-pub struct NavigateCommand {
-    direction: NavigationDirection,
-}
-
-impl NavigateCommand {
-    /// Create a new navigate command.
-    #[must_use]
-    pub fn new(direction: NavigationDirection) -> Self {
-        Self { direction }
-    }
-
-    /// Execute the navigate command.
-    pub fn execute(&self, manager: &mut DocumentManager) -> DocResult<Option<PathBuf>> {
-        let path = match self.direction {
-            NavigationDirection::Next => manager.next_document(),
-            NavigationDirection::Previous => manager.previous_document(),
-        };
-
-        Ok(path)
-    }
-
-    /// Check if navigation is possible.
-    #[must_use]
-    pub fn can_execute(&self, manager: &DocumentManager) -> bool {
-        match self.direction {
-            NavigationDirection::Next => manager.has_next(),
-            NavigationDirection::Previous => manager.has_previous(),
-        }
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_navigate_command_creation() {
-        let cmd = NavigateCommand::new(NavigationDirection::Next);
-        assert_eq!(cmd.direction, NavigationDirection::Next);
-
-        let cmd = NavigateCommand::new(NavigationDirection::Previous);
-        assert_eq!(cmd.direction, NavigationDirection::Previous);
-    }
-}
diff --git a/src/application/commands/open_document.rs b/src/application/commands/open_document.rs
deleted file mode 100644
index 35fab80..0000000
--- a/src/application/commands/open_document.rs
+++ /dev/null
@@ -1,34 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/application/commands/open_document.rs
-//
-// Open document command: load a document from a file path.
-// Reserved for future CQRS pattern - currently using direct DocumentManager methods.
-
-#![allow(dead_code)]
-
-use std::path::Path;
-
-use crate::application::document_manager::DocumentManager;
-use crate::domain::document::core::document::DocResult;
-
-/// Open document command.
-pub struct OpenDocumentCommand;
-
-impl OpenDocumentCommand {
-    /// Create a new open document command.
-    #[must_use]
-    pub fn new() -> Self {
-        Self
-    }
-
-    /// Execute the open document command.
-    pub fn execute(&self, manager: &mut DocumentManager, path: &Path) -> DocResult<()> {
-        manager.open_document(path)
-    }
-}
-
-impl Default for OpenDocumentCommand {
-    fn default() -> Self {
-        Self::new()
-    }
-}
diff --git a/src/application/commands/save_document.rs b/src/application/commands/save_document.rs
deleted file mode 100644
index 9761ab1..0000000
--- a/src/application/commands/save_document.rs
+++ /dev/null
@@ -1,64 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/application/commands/save_document.rs
-//
-// Save document command: export document to a file.
-// Reserved for future implementation - not yet used.
-
-#![allow(dead_code)]
-
-use std::path::Path;
-
-use crate::application::document_manager::DocumentManager;
-use crate::domain::document::core::document::DocResult;
-use crate::domain::document::operations::export::ExportFormat;
-
-/// Save document command.
-pub struct SaveDocumentCommand {
-    /// Target format for export.
-    format: Option<ExportFormat>,
-}
-
-impl SaveDocumentCommand {
-    /// Create a new save document command with automatic format detection.
-    #[must_use]
-    pub fn new() -> Self {
-        Self { format: None }
-    }
-
-    /// Create a save document command with a specific format.
-    #[must_use]
-    pub fn with_format(format: ExportFormat) -> Self {
-        Self {
-            format: Some(format),
-        }
-    }
-
-    /// Execute the save document command.
-    pub fn execute(&self, manager: &DocumentManager, path: &Path) -> DocResult<()> {
-        let _document = manager
-            .current_document()
-            .ok_or_else(|| anyhow::anyhow!("No document loaded"))?;
-
-        // Detect format from path or use specified format
-        let format = self
-            .format
-            .or_else(|| ExportFormat::from_path(path))
-            .ok_or_else(|| anyhow::anyhow!("Could not determine export format"))?;
-
-        // TODO: Implement actual save logic
-        // This would involve:
-        // 1. Getting the rendered image from the document
-        // 2. Applying any necessary transformations
-        // 3. Exporting to the target format
-
-        log::info!("Save to {} as {:?}", path.display(), format);
-
-        Err(anyhow::anyhow!("Save operation not yet implemented"))
-    }
-}
-
-impl Default for SaveDocumentCommand {
-    fn default() -> Self {
-        Self::new()
-    }
-}
diff --git a/src/application/commands/transform_document.rs b/src/application/commands/transform_document.rs
deleted file mode 100644
index d2f5bc4..0000000
--- a/src/application/commands/transform_document.rs
+++ /dev/null
@@ -1,81 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/application/commands/transform_document.rs
-//
-// Transform document command: rotate, flip, and other transformations.
-
-use crate::application::document_manager::DocumentManager;
-use crate::domain::document::core::document::{DocResult, Rotation};
-use crate::domain::document::operations::transform;
-
-/// Transformation operation.
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-#[allow(dead_code)]
-pub enum TransformOperation {
-    /// Rotate clockwise by 90 degrees.
-    RotateCw,
-    /// Rotate counter-clockwise by 90 degrees.
-    RotateCcw,
-    /// Flip horizontally.
-    FlipHorizontal,
-    /// Flip vertically.
-    FlipVertical,
-    /// Rotate to a specific angle.
-    RotateTo(Rotation),
-}
-
-/// Transform document command.
-pub struct TransformDocumentCommand {
-    operation: TransformOperation,
-}
-
-impl TransformDocumentCommand {
-    /// Create a new transform document command.
-    #[must_use]
-    pub fn new(operation: TransformOperation) -> Self {
-        Self { operation }
-    }
-
-    /// Execute the transform command.
-    ///
-    /// Uses high-level transform operations that work across all document types
-    /// (Raster, Vector, Portable).
-    pub fn execute(&self, manager: &mut DocumentManager) -> DocResult<()> {
-        let document = manager
-            .current_document_mut()
-            .ok_or_else(|| anyhow::anyhow!("No document loaded"))?;
-
-        match self.operation {
-            TransformOperation::RotateCw => {
-                transform::rotate_document_cw(document)?;
-            }
-            TransformOperation::RotateCcw => {
-                transform::rotate_document_ccw(document)?;
-            }
-            TransformOperation::FlipHorizontal => {
-                transform::flip_document_horizontal(document)?;
-            }
-            TransformOperation::FlipVertical => {
-                transform::flip_document_vertical(document)?;
-            }
-            TransformOperation::RotateTo(rotation) => {
-                transform::rotate_document_to(document, rotation)?;
-            }
-        }
-
-        Ok(())
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_transform_command_creation() {
-        let cmd = TransformDocumentCommand::new(TransformOperation::RotateCw);
-        assert_eq!(cmd.operation, TransformOperation::RotateCw);
-
-        let cmd = TransformDocumentCommand::new(TransformOperation::FlipHorizontal);
-        assert_eq!(cmd.operation, TransformOperation::FlipHorizontal);
-    }
-}
diff --git a/src/application/document_manager.rs b/src/application/document_manager.rs
deleted file mode 100644
index 29f9f8b..0000000
--- a/src/application/document_manager.rs
+++ /dev/null
@@ -1,216 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/application/document_manager.rs
-//
-// Document manager: orchestrates document lifecycle and navigation.
-
-use std::path::{Path, PathBuf};
-
-use crate::domain::document::collection::DocumentCollection;
-use crate::domain::document::core::content::DocumentContent;
-use crate::domain::document::core::document::DocResult;
-use crate::domain::document::core::metadata::DocumentMeta;
-use crate::infrastructure::filesystem::file_ops;
-use crate::infrastructure::loaders::DocumentLoaderFactory;
-
-/// Central document manager.
-///
-/// Orchestrates document loading, metadata extraction, and folder navigation.
-/// Uses DocumentCollection (Domain Layer) for navigation logic.
-pub struct DocumentManager {
-    /// Document collection for navigation (Domain Layer abstraction).
-    collection: DocumentCollection,
-    /// Current document metadata.
-    current_metadata: Option<DocumentMeta>,
-    /// Document loader factory.
-    loader: DocumentLoaderFactory,
-}
-
-impl DocumentManager {
-    /// Create a new document manager.
-    #[must_use]
-    pub fn new() -> Self {
-        Self {
-            collection: DocumentCollection::new(),
-            current_metadata: None,
-            loader: DocumentLoaderFactory::new(),
-        }
-    }
-
-    /// Open a document from a file path or directory.
-    ///
-    /// If a directory is provided, opens the first supported file found.
-    /// Also scans the parent folder for navigation.
-    pub fn open_document(&mut self, path: &Path) -> DocResult<()> {
-        // Determine the actual file to open
-        let file_path = if path.is_dir() {
-            // Scan directory and find first supported file
-            let paths = file_ops::collect_supported_files(path);
-            self.collection = DocumentCollection::from_paths(paths);
-
-            self.collection
-                .current_path()
-                .ok_or_else(|| anyhow::anyhow!("No supported files found in directory"))?
-                .clone()
-        } else {
-            path.to_path_buf()
-        };
-
-        // Load the document
-        let document = self.loader.load(&file_path)?;
-
-        // Extract metadata
-        let metadata = self.extract_metadata(&file_path, &document);
-
-        // Scan folder for navigation if not already done
-        if !path.is_dir() {
-            if let Some(parent) = file_path.parent() {
-                let paths = file_ops::collect_supported_files(parent);
-                self.collection = DocumentCollection::from_paths(paths);
-                // Find and set current document index
-                if let Some(idx) = self.collection.paths().iter().position(|p| p == &file_path) {
-                    self.collection.goto(idx);
-                }
-            }
-        }
-
-        // Generate thumbnails for multi-page documents (PDF)
-        let mut document = document;
-        if document.is_multi_page() {
-            log::info!("Generating thumbnails for multi-page document...");
-            if let Err(e) = document.generate_thumbnails() {
-                log::warn!("Failed to generate thumbnails: {e}");
-            }
-        }
-
-        // Store document in collection
-        self.collection.set_current_document(document);
-        self.current_metadata = Some(metadata);
-
-        Ok(())
-    }
-
-    /// Get the current document.
-    #[must_use]
-    pub fn current_document(&self) -> Option<&DocumentContent> {
-        self.collection.current_document()
-    }
-
-    /// Get a mutable reference to the current document.
-    #[must_use]
-    pub fn current_document_mut(&mut self) -> Option<&mut DocumentContent> {
-        self.collection.current_document_mut()
-    }
-
-    /// Get thumbnail handle for a specific page (read-only access).
-    /// Returns None if the thumbnail hasn't been generated yet.
-    #[must_use]
-    pub fn get_thumbnail_handle(&self, page: usize) -> Option<cosmic::widget::image::Handle> {
-        self.collection
-            .current_document()?
-            .get_thumbnail_handle(page)
-    }
-
-    /// Get the current document path.
-    #[must_use]
-    pub fn current_path(&self) -> Option<&Path> {
-        self.collection.current_path().map(|p| p.as_path())
-    }
-
-    /// Get the current document metadata.
-    #[must_use]
-    pub fn current_metadata(&self) -> Option<&DocumentMeta> {
-        self.current_metadata.as_ref()
-    }
-
-    /// Get all folder entries for navigation.
-    #[must_use]
-    pub fn folder_entries(&self) -> &[PathBuf] {
-        self.collection.paths()
-    }
-
-    /// Get current index in folder.
-    #[must_use]
-    pub fn current_index(&self) -> Option<usize> {
-        self.collection.current_index()
-    }
-
-    /// Navigate to the next document in the folder.
-    ///
-    /// Wraps around to the first document when at the end.
-    pub fn next_document(&mut self) -> Option<PathBuf> {
-        // Use DocumentCollection navigation
-        if self.collection.has_next() {
-            self.collection.next();
-        } else if !self.collection.is_empty() {
-            // Wrap around to first
-            self.collection.goto(0);
-        } else {
-            return None;
-        }
-
-        let next_path = self.collection.current_path()?.clone();
-        if self.open_document(&next_path).is_ok() {
-            Some(next_path)
-        } else {
-            None
-        }
-    }
-
-    /// Navigate to the previous document in the folder.
-    ///
-    /// Wraps around to the last document when at the beginning.
-    pub fn previous_document(&mut self) -> Option<PathBuf> {
-        // Use DocumentCollection navigation
-        if self.collection.has_previous() {
-            self.collection.previous();
-        } else if !self.collection.is_empty() {
-            // Wrap around to last
-            let last_idx = self.collection.len() - 1;
-            self.collection.goto(last_idx);
-        } else {
-            return None;
-        }
-
-        let prev_path = self.collection.current_path()?.clone();
-        if self.open_document(&prev_path).is_ok() {
-            Some(prev_path)
-        } else {
-            None
-        }
-    }
-
-    /// Close the current document.
-    #[allow(dead_code)]
-    pub fn close_document(&mut self) {
-        self.collection.clear_current_document();
-        self.current_metadata = None;
-    }
-
-    /// Extract metadata from a document.
-    fn extract_metadata(&self, path: &Path, document: &DocumentContent) -> DocumentMeta {
-        // Use the document's own extract_meta() method
-        // This properly delegates to the type-specific implementation
-        // (RasterDocument, VectorDocument, or PortableDocument)
-        document.extract_meta(path)
-    }
-
-    /// Check if there is a next document available.
-    #[must_use]
-    #[allow(dead_code)]
-    pub fn has_next(&self) -> bool {
-        self.collection.has_next()
-    }
-
-    /// Check if there is a previous document available.
-    #[must_use]
-    #[allow(dead_code)]
-    pub fn has_previous(&self) -> bool {
-        self.collection.has_previous()
-    }
-}
-
-impl Default for DocumentManager {
-    fn default() -> Self {
-        Self::new()
-    }
-}
diff --git a/src/application/mod.rs b/src/application/mod.rs
deleted file mode 100644
index 00e19f2..0000000
--- a/src/application/mod.rs
+++ /dev/null
@@ -1,11 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/application/mod.rs
-//
-// Application layer: use cases, commands, queries, and services.
-
-pub mod commands;
-pub mod document_manager;
-pub mod services;
-
-// Re-export document manager
-pub use document_manager::DocumentManager;
diff --git a/src/application/services/cache_service.rs b/src/application/services/cache_service.rs
deleted file mode 100644
index 2fda4bc..0000000
--- a/src/application/services/cache_service.rs
+++ /dev/null
@@ -1,81 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/application/services/cache_service.rs
-//
-// Cache service: manages document and thumbnail caching.
-// Reserved for future caching layer implementation.
-
-#![allow(dead_code)]
-
-use std::path::Path;
-
-use cosmic::widget::image::Handle as ImageHandle;
-use image::DynamicImage;
-
-use crate::infrastructure::cache::ThumbnailCache;
-
-/// Cache service for managing document caches.
-///
-/// Provides high-level caching operations for the application layer.
-pub struct CacheService;
-
-impl CacheService {
-    /// Create a new cache service.
-    #[must_use]
-    pub fn new() -> Self {
-        Self
-    }
-
-    /// Load a thumbnail from cache.
-    ///
-    /// Returns None if the thumbnail is not cached or the cache is invalid.
-    #[must_use]
-    pub fn get_thumbnail(&self, path: &Path, page: usize) -> Option<ImageHandle> {
-        ThumbnailCache::load(path, page)
-    }
-
-    /// Save a thumbnail to cache.
-    ///
-    /// Returns true if the thumbnail was successfully cached.
-    pub fn put_thumbnail(&self, path: &Path, page: usize, image: &DynamicImage) -> bool {
-        ThumbnailCache::save(path, page, image).is_some()
-    }
-
-    /// Clear all cached thumbnails.
-    ///
-    /// This operation is not yet implemented.
-    pub fn clear_cache(&self) -> Result<(), String> {
-        ThumbnailCache::clear_cache().map_err(|e| e.to_string())
-    }
-
-    /// Get the size of the cache directory.
-    ///
-    /// Returns the total size in bytes, or None if it cannot be determined.
-    #[must_use]
-    pub fn cache_size(&self) -> Option<u64> {
-        // TODO: Implement cache size calculation
-        None
-    }
-}
-
-impl Default for CacheService {
-    fn default() -> Self {
-        Self::new()
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_cache_service_creation() {
-        let service = CacheService::new();
-        assert!(std::ptr::eq(&service, &service)); // Dummy test
-    }
-
-    #[test]
-    fn test_cache_service_default() {
-        let service = CacheService::default();
-        assert!(std::ptr::eq(&service, &service)); // Dummy test
-    }
-}
diff --git a/src/application/services/mod.rs b/src/application/services/mod.rs
deleted file mode 100644
index 8efbbe9..0000000
--- a/src/application/services/mod.rs
+++ /dev/null
@@ -1,7 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/application/services/mod.rs
-//
-// Application services: cache management and preview generation.
-
-pub mod cache_service;
-pub mod preview_service;
diff --git a/src/application/services/preview_service.rs b/src/application/services/preview_service.rs
deleted file mode 100644
index ab23906..0000000
--- a/src/application/services/preview_service.rs
+++ /dev/null
@@ -1,119 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/application/services/preview_service.rs
-//
-// Preview service: generates thumbnails and previews for documents.
-// Reserved for future async thumbnail generation implementation.
-
-#![allow(dead_code)]
-
-use cosmic::widget::image::Handle as ImageHandle;
-
-use crate::domain::document::core::content::DocumentContent;
-use crate::domain::document::core::document::DocResult;
-
-/// Preview service for generating document thumbnails and previews.
-///
-/// Provides high-level preview generation operations for the application layer.
-pub struct PreviewService {
-    /// Target thumbnail size (width in pixels).
-    thumbnail_size: u32,
-}
-
-impl PreviewService {
-    /// Create a new preview service with default thumbnail size.
-    #[must_use]
-    pub fn new() -> Self {
-        Self {
-            thumbnail_size: 256,
-        }
-    }
-
-    /// Create a preview service with a specific thumbnail size.
-    #[must_use]
-    pub fn with_thumbnail_size(size: u32) -> Self {
-        Self {
-            thumbnail_size: size,
-        }
-    }
-
-    /// Set the thumbnail size.
-    pub fn set_thumbnail_size(&mut self, size: u32) {
-        self.thumbnail_size = size;
-    }
-
-    /// Get the current thumbnail size.
-    #[must_use]
-    pub fn thumbnail_size(&self) -> u32 {
-        self.thumbnail_size
-    }
-
-    /// Generate a thumbnail for a document page.
-    ///
-    /// For single-page documents, the page parameter is ignored.
-    pub fn generate_thumbnail(
-        &self,
-        document: &mut DocumentContent,
-        page: usize,
-    ) -> DocResult<Option<ImageHandle>> {
-        if document.is_multi_page() {
-            document.get_thumbnail(page)
-        } else {
-            // For single-page documents, return the current handle
-            Ok(document.handle())
-        }
-    }
-
-    /// Generate all thumbnails for a multi-page document.
-    ///
-    /// Returns the number of thumbnails generated.
-    pub fn generate_all_thumbnails(&self, document: &mut DocumentContent) -> DocResult<usize> {
-        if !document.is_multi_page() {
-            return Ok(0);
-        }
-
-        document.generate_thumbnails()?;
-        Ok(document.thumbnails_loaded())
-    }
-
-    /// Check if all thumbnails are ready for a document.
-    #[must_use]
-    pub fn thumbnails_ready(&self, document: &DocumentContent) -> bool {
-        document.thumbnails_ready()
-    }
-
-    /// Get the number of thumbnails loaded for a document.
-    #[must_use]
-    pub fn thumbnails_loaded(&self, document: &DocumentContent) -> usize {
-        document.thumbnails_loaded()
-    }
-}
-
-impl Default for PreviewService {
-    fn default() -> Self {
-        Self::new()
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_preview_service_creation() {
-        let service = PreviewService::new();
-        assert_eq!(service.thumbnail_size(), 256);
-    }
-
-    #[test]
-    fn test_preview_service_with_size() {
-        let service = PreviewService::with_thumbnail_size(512);
-        assert_eq!(service.thumbnail_size(), 512);
-    }
-
-    #[test]
-    fn test_set_thumbnail_size() {
-        let mut service = PreviewService::new();
-        service.set_thumbnail_size(128);
-        assert_eq!(service.thumbnail_size(), 128);
-    }
-}
diff --git a/src/config.rs b/src/config.rs
deleted file mode 100644
index adcf9eb..0000000
--- a/src/config.rs
+++ /dev/null
@@ -1,44 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/config.rs
-//
-// Global configuration for the application with cosmic-config support.
-
-use cosmic::cosmic_config::{self, CosmicConfigEntry, cosmic_config_derive::CosmicConfigEntry};
-use std::path::PathBuf;
-
-/// Global configuration for the application.
-#[derive(Debug, Clone, CosmicConfigEntry, PartialEq)]
-#[version = 1]
-pub struct AppConfig {
-    /// Default directory to open when browsing for documents.
-    pub default_image_dir: Option<PathBuf>,
-    /// Show page navigation panel (left sidebar for multi-page documents).
-    pub nav_bar_visible: bool,
-    /// Show properties panel (right sidebar with metadata).
-    pub context_drawer_visible: bool,
-    /// Zoom step multiplier for keyboard shortcuts (1.1 = 10% increase per step).
-    pub scale_step: f32,
-    /// Pan distance in pixels per arrow key press.
-    pub pan_step: f32,
-    /// Minimum zoom level (0.1 = 10% of original size).
-    pub min_scale: f32,
-    /// Maximum zoom level (8.0 = 800% of original size).
-    pub max_scale: f32,
-    /// Show 3x3 grid during crop selection.
-    pub crop_show_grid: bool,
-}
-
-impl Default for AppConfig {
-    fn default() -> Self {
-        Self {
-            default_image_dir: dirs::picture_dir().or_else(dirs::home_dir),
-            nav_bar_visible: false,
-            context_drawer_visible: false,
-            scale_step: 1.1,
-            pan_step: 50.0,
-            min_scale: 0.1,
-            max_scale: 8.0,
-            crop_show_grid: true,
-        }
-    }
-}
diff --git a/src/document/command.rs b/src/document/command.rs
new file mode 100644
index 0000000..7fe0ee1
--- /dev/null
+++ b/src/document/command.rs
@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// src/document/command.rs
+//
+// Commands that operate on the active document itself.
+
+/// Commands operating on the active document (zoom, export, annotate, …).
+///
+/// The `DocumentManager` dispatches these after resolving which document is
+/// active – the UI never needs to know the underlying format.
+#[derive(Debug, Clone)]
+pub enum DocumentCommand {
+    // Reserved for future use: Rotate, Flip, Zoom, Export, Annotate, …
+}
diff --git a/src/document/loader.rs b/src/document/loader.rs
new file mode 100644
index 0000000..f361d0b
--- /dev/null
+++ b/src/document/loader.rs
@@ -0,0 +1,101 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// src/document/loader.rs
+//
+// Document loading: format detection, format dispatch, and directory scanning.
+
+use crate::document::model::{PortableModel, RasterModel, VectorModel};
+use crate::document::session::data::{SessionData, SessionItem};
+use crate::document::types::PageLayout;
+use crate::document::DocumentContent;
+use crate::error::{Error, Result};
+use std::path::Path;
+
+/// The three document formats Noctua understands.
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub(crate) enum DocumentFormat {
+    /// Raster images – anything the image crate can decode.
+    Raster,
+    /// Vector graphics (SVG).
+    Vector,
+    /// Portable documents (PDF).
+    Portable,
+}
+
+/// Detects the document format from the file extension.
+///
+/// Returns `None` for unknown extensions so directory scans can skip
+/// unsupported files early. At load time the underlying library
+/// (`ImageReader`, `usvg`, `pdfium`) is the final authority.
+fn detect_format(path: &Path) -> Option<DocumentFormat> {
+    match path
+        .extension()
+        .and_then(|e| e.to_str())
+        .map(str::to_lowercase)
+        .as_deref()
+    {
+        Some("pdf") => Some(DocumentFormat::Portable),
+        Some("svg") => Some(DocumentFormat::Vector),
+        Some("png" | "jpg" | "jpeg" | "webp" | "gif" | "bmp" | "tiff" | "tif") => {
+            Some(DocumentFormat::Raster)
+        }
+        _ => None,
+    }
+}
+
+/// Loads a document from a path and returns its content.
+///
+/// # Errors
+///
+/// Returns [`Error::NotFound`] if the path does not exist.
+/// Returns [`Error::Unsupported`] if the file extension is not recognised.
+pub(crate) fn load_document(path: &Path) -> Result<DocumentContent> {
+    if !path.exists() {
+        return Err(Error::NotFound(format!("{}", path.display())));
+    }
+
+    match detect_format(path) {
+        Some(DocumentFormat::Portable) => {
+            // TODO: Replace with actual pdfium-render loading.
+            Ok(DocumentContent::Portable(PortableModel {
+                path: path.to_path_buf(),
+                page_count: 3,
+                layout: PageLayout::new(vec![(595.0, 842.0); 3], 10.0),
+            }))
+        }
+        Some(DocumentFormat::Vector) => {
+            // TODO: Replace with actual usvg parsing.
+            Ok(DocumentContent::Vector(VectorModel {
+                path: path.to_path_buf(),
+                view_box: None,
+            }))
+        }
+        Some(DocumentFormat::Raster) => {
+            // TODO: Replace with actual image-crate loading.
+            Ok(DocumentContent::Raster(RasterModel {
+                path: path.to_path_buf(),
+                dimensions: (1920, 1080),
+            }))
+        }
+        None => Err(Error::Unsupported(format!(
+            "extension: {}",
+            path.extension()
+                .and_then(|e| e.to_str())
+                .unwrap_or("(none)")
+        ))),
+    }
+}
+
+/// Scans a directory for supported files and populates the session.
+pub(crate) fn scan_directory_into(session: &mut SessionData, dir: &Path) {
+    if let Ok(entries) = std::fs::read_dir(dir) {
+        let mut paths: Vec<_> = entries
+            .filter_map(std::result::Result::ok)
+            .map(|e| e.path())
+            .filter(|p| p.is_file() && detect_format(p).is_some())
+            .collect();
+
+        paths.sort();
+
+        session.items = paths.into_iter().map(|p| SessionItem::new(p, 0)).collect();
+    }
+}
diff --git a/src/document/manager.rs b/src/document/manager.rs
new file mode 100644
index 0000000..19de638
--- /dev/null
+++ b/src/document/manager.rs
@@ -0,0 +1,418 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// src/document/manager.rs
+//
+// Document manager: session state, cursors, clipboard, and command dispatch.
+
+use crate::document::loader::{load_document, scan_directory_into};
+use crate::document::session::command::SessionCommand;
+use crate::document::session::data::{CollectionKind, SessionData, SessionItem};
+use crate::document::session::store;
+use crate::document::DocumentContent;
+use crate::error::Error;
+use std::path::{Path, PathBuf};
+
+/// The load state of the currently viewed document.
+#[derive(Debug)]
+pub enum DocumentState {
+    Empty,
+    Loading,
+    Loaded(DocumentContent),
+    Error(Error),
+}
+
+/// Central state for all sessions, cursors, and the document clipboard.
+///
+/// Two cursors are maintained:
+/// - `active_session_index` – the currently active session
+/// - `active_document_index` – the currently active document within that session
+///
+/// All `SessionCommand` variants that do not carry an explicit target operate
+/// on the active cursor. `SelectSession` and `SelectDocument` set them.
+pub struct DocumentManager {
+    sessions: Vec<SessionData>,
+    active_session_index: Option<usize>,
+    active_document_index: Option<usize>,
+    clipboard: Option<SessionItem>,
+    session_file_path: Option<PathBuf>,
+    pub state: DocumentState,
+}
+
+impl Default for DocumentManager {
+    fn default() -> Self {
+        Self {
+            sessions: Vec::new(),
+            active_session_index: None,
+            active_document_index: None,
+            clipboard: None,
+            session_file_path: None,
+            state: DocumentState::Empty,
+        }
+    }
+}
+
+impl DocumentManager {
+    #[must_use]
+    pub fn new() -> Self {
+        Self::default()
+    }
+
+    /// The single public entry point for all session and document state changes.
+    pub fn handle(&mut self, command: SessionCommand) {
+        match command {
+            // Session lifecycle
+            SessionCommand::NewSession { name } => self.new_session(&name),
+            SessionCommand::OpenSession { path } => self.open_session_file(&path),
+            SessionCommand::DeleteSession => self.delete_session(),
+            SessionCommand::SaveSession => self.save_session(),
+            SessionCommand::SelectSession { name } => self.select_session(&name),
+            SessionCommand::DuplicateSession { new_name } => self.duplicate_session(&new_name),
+            SessionCommand::RenameSession { name } => self.rename_session(&name),
+
+            // Collection management
+            SessionCommand::AddDirectoryToSession { dir } => {
+                if let Some(session) = self.active_session_mut() {
+                    scan_directory_into(session, &dir);
+                }
+                self.reset_document_cursor();
+            }
+            SessionCommand::AddDocumentToSession { path } => self.add_document(&path),
+
+            // Document management
+            SessionCommand::SelectDocument { index } => self.select_document(index),
+            SessionCommand::CopyDocument => self.copy_document(),
+            SessionCommand::PasteDocument => self.paste_document(),
+            SessionCommand::RemoveDocument => self.remove_document(),
+            SessionCommand::NextDocument => self.navigate_next(),
+            SessionCommand::PreviousDocument => self.navigate_previous(),
+            SessionCommand::MoveDocumentUp => self.move_document_up(),
+            SessionCommand::MoveDocumentDown => self.move_document_down(),
+            SessionCommand::MoveDocumentTo { index } => self.move_document_to(index),
+        }
+    }
+
+    /// Read-only access to the active session.
+    #[must_use]
+    pub fn active_session(&self) -> Option<&SessionData> {
+        self.active_session_index.map(|i| &self.sessions[i])
+    }
+
+    /// The index of the currently active document within the active session.
+    #[must_use]
+    pub fn active_document_index(&self) -> Option<usize> {
+        self.active_document_index
+    }
+
+    /// Read-only access to all sessions.
+    #[must_use]
+    pub fn sessions(&self) -> &[SessionData] {
+        &self.sessions
+    }
+
+    /// Read-only access to a session by name.
+    #[must_use]
+    pub fn session_by_name(&self, name: &str) -> Option<&SessionData> {
+        self.sessions.iter().find(|s| s.name == name)
+    }
+
+    // -- Private helpers --
+
+    fn active_session_mut(&mut self) -> Option<&mut SessionData> {
+        self.active_session_index.map(|i| &mut self.sessions[i])
+    }
+
+    fn index_by_name(&self, name: &str) -> Option<usize> {
+        self.sessions.iter().position(|s| s.name == name)
+    }
+
+    /// Sets `active_document_index` to `Some(0)` if the active session has items, else `None`.
+    fn reset_document_cursor(&mut self) {
+        self.active_document_index = match self.active_session() {
+            Some(s) if !s.items.is_empty() => Some(0),
+            _ => None,
+        };
+    }
+
+    fn new_session(&mut self, name: &str) {
+        if self.index_by_name(name).is_some() {
+            return;
+        }
+        self.sessions.push(SessionData::new(
+            name,
+            CollectionKind::DocumentCollection,
+            None,
+            Vec::new(),
+        ));
+    }
+
+    fn open_session_file(&mut self, path: &Path) {
+        match store::load_sessions(path) {
+            Ok(mut loaded) => {
+                for session in &mut loaded {
+                    session.items.retain(|item| {
+                        if item.path.exists() {
+                            true
+                        } else {
+                            log::error!(
+                                "Session '{}': {}",
+                                session.name,
+                                Error::NotFound(item.path.display().to_string())
+                            );
+                            false
+                        }
+                    });
+                }
+
+                let browser_index = loaded
+                    .iter()
+                    .position(|s| s.kind == CollectionKind::DirectoryBrowser);
+
+                self.sessions = loaded;
+                self.active_session_index = browser_index;
+                self.session_file_path = Some(path.to_path_buf());
+                self.state = DocumentState::Empty;
+                self.reset_document_cursor();
+            }
+            Err(e) => {
+                self.state = DocumentState::Error(e);
+            }
+        }
+    }
+
+    // We have no 'Close session' it wouldbe only removes it from runtime, keeps it in .ron file
+    // For actual deletion, use delete_session()
+    // So 'close_session' from ui view is save_session and close session view.
+
+    fn delete_session(&mut self) {
+        let Some(idx) = self.active_session_index else {
+            return;
+        };
+
+        // The DirectoryBrowser session is managed by the UI and cannot be deleted.
+        if self.sessions[idx].kind == CollectionKind::DirectoryBrowser {
+            return;
+        }
+
+        self.sessions.remove(idx);
+        self.active_document_index = None;
+
+        self.active_session_index = if self.sessions.is_empty() {
+            None
+        } else {
+            Some(idx.saturating_sub(1))
+        };
+    }
+
+    fn save_session(&mut self) {
+        let Some(ref path) = self.session_file_path else {
+            return;
+        };
+        if let Err(e) = store::save_sessions(&path, &self.sessions) {
+            self.state = DocumentState::Error(e);
+        }
+    }
+
+    fn select_session(&mut self, name: &str) {
+        if let Some(idx) = self.index_by_name(name) {
+            self.active_session_index = Some(idx);
+            self.reset_document_cursor();
+        }
+    }
+
+    fn duplicate_session(&mut self, new_name: &str) {
+        if self.index_by_name(new_name).is_some() {
+            return;
+        }
+        let Some(idx) = self.active_session_index else {
+            return;
+        };
+        let items = self.sessions[idx].items.clone();
+        self.sessions.push(SessionData::new(
+            new_name,
+            CollectionKind::DocumentCollection,
+            None,
+            items,
+        ));
+    }
+
+    fn rename_session(&mut self, name: &str) {
+        let Some(idx) = self.active_session_index else {
+            return;
+        };
+
+        // The DirectoryBrowser session cannot be renamed.
+        if self.sessions[idx].kind == CollectionKind::DirectoryBrowser {
+            return;
+        }
+
+        if self.index_by_name(name).is_some() {
+            return;
+        }
+
+        self.sessions[idx].name = name.to_string();
+    }
+
+    fn add_document(&mut self, path: &Path) {
+        self.state = DocumentState::Loading;
+        match load_document(path) {
+            Ok(content) => {
+                if let Some(session) = self.active_session_mut() {
+                    if session.kind == CollectionKind::DocumentCollection
+                        && !session.items.iter().any(|i| i.path == path)
+                    {
+                        session.items.push(SessionItem::new(path.to_path_buf(), 0));
+                    }
+                }
+                self.active_document_index = self
+                    .active_session()
+                    .and_then(|s| s.items.iter().position(|i| i.path == path));
+                self.state = DocumentState::Loaded(content);
+            }
+            Err(e) => {
+                self.state = DocumentState::Error(e);
+            }
+        }
+    }
+
+    fn select_document(&mut self, index: usize) {
+        if let Some(session) = self.active_session() {
+            if index < session.items.len() {
+                self.active_document_index = Some(index);
+            }
+        }
+    }
+
+    fn copy_document(&mut self) {
+        let Some(idx) = self.active_document_index else {
+            return;
+        };
+        self.clipboard = self
+            .active_session()
+            .and_then(|s| s.items.get(idx))
+            .cloned();
+    }
+
+    fn paste_document(&mut self) {
+        let Some(item) = self.clipboard.clone() else {
+            return;
+        };
+
+        if !matches!(
+            self.active_session().map(|s| &s.kind),
+            Some(CollectionKind::DocumentCollection)
+        ) {
+            return;
+        }
+
+        let new_index = {
+            let Some(session) = self.active_session_mut() else {
+                return;
+            };
+
+            if session
+                .items
+                .iter()
+                .any(|i| i.path == item.path && i.page_index == item.page_index)
+            {
+                return;
+            }
+
+            session.items.push(item);
+            session.items.len() - 1
+        };
+
+        self.active_document_index = Some(new_index);
+    }
+
+    fn remove_document(&mut self) {
+        if !matches!(
+            self.active_session().map(|s| &s.kind),
+            Some(CollectionKind::DocumentCollection)
+        ) {
+            return;
+        }
+
+        let Some(idx) = self.active_document_index else {
+            return;
+        };
+
+        let new_index = {
+            let Some(session) = self.active_session_mut() else {
+                return;
+            };
+
+            if idx >= session.items.len() {
+                return;
+            }
+
+            session.items.remove(idx);
+            let new_len = session.items.len();
+            if new_len == 0 {
+                None
+            } else {
+                Some(idx.min(new_len - 1))
+            }
+        };
+
+        self.active_document_index = new_index;
+    }
+
+    fn navigate_next(&mut self) {
+        let len = self.active_session().map_or(0, |s| s.items.len());
+        if let Some(idx) = self.active_document_index {
+            if idx + 1 < len {
+                self.active_document_index = Some(idx + 1);
+            }
+        }
+    }
+
+    fn navigate_previous(&mut self) {
+        if let Some(idx) = self.active_document_index {
+            if idx > 0 {
+                self.active_document_index = Some(idx - 1);
+            }
+        }
+    }
+
+    fn move_document_up(&mut self) {
+        let Some(idx) = self.active_document_index else {
+            return;
+        };
+        if idx == 0 {
+            return;
+        }
+        let Some(session) = self.active_session_mut() else {
+            return;
+        };
+        session.items.swap(idx, idx - 1);
+        self.active_document_index = Some(idx - 1);
+    }
+
+    fn move_document_down(&mut self) {
+        let Some(idx) = self.active_document_index else {
+            return;
+        };
+        let Some(session) = self.active_session_mut() else {
+            return;
+        };
+        if idx + 1 >= session.items.len() {
+            return;
+        }
+        session.items.swap(idx, idx + 1);
+        self.active_document_index = Some(idx + 1);
+    }
+
+    fn move_document_to(&mut self, target: usize) {
+        let Some(idx) = self.active_document_index else {
+            return;
+        };
+        let Some(session) = self.active_session_mut() else {
+            return;
+        };
+        if idx == target || target >= session.items.len() {
+            return;
+        }
+        let item = session.items.remove(idx);
+        session.items.insert(target, item);
+        self.active_document_index = Some(target);
+    }
+}
diff --git a/src/document/mod.rs b/src/document/mod.rs
new file mode 100644
index 0000000..f620821
--- /dev/null
+++ b/src/document/mod.rs
@@ -0,0 +1,24 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// src/document/mod.rs
+//
+// Document abstraction – the public surface of the document subsystem.
+
+pub mod command;
+pub mod loader;
+pub mod manager;
+pub mod model;
+pub mod session;
+pub mod types;
+
+use self::model::{PortableModel, RasterModel, VectorModel};
+
+/// The decoded content of a loaded document.
+///
+/// This enum is internal to Noctua. The UI only ever sees a `RawImage`
+/// produced by the render subsystem – it never matches on this type.
+#[derive(Debug)]
+pub enum DocumentContent {
+    Raster(RasterModel),
+    Vector(VectorModel),
+    Portable(PortableModel),
+}
diff --git a/src/document/model/mod.rs b/src/document/model/mod.rs
new file mode 100644
index 0000000..7ede092
--- /dev/null
+++ b/src/document/model/mod.rs
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// src/document/model/mod.rs
+//
+// The three concrete document models Noctua understands.
+
+pub mod portable;
+pub mod raster;
+pub mod vector;
+
+pub use portable::PortableModel;
+pub use raster::RasterModel;
+pub use vector::VectorModel;
diff --git a/src/document/model/portable.rs b/src/document/model/portable.rs
new file mode 100644
index 0000000..cdcdc43
--- /dev/null
+++ b/src/document/model/portable.rs
@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// src/document/model/portable.rs
+//
+// Portable document format model (PDF).
+
+use crate::document::types::PageLayout;
+use std::path::PathBuf;
+
+#[derive(Clone, Debug)]
+pub struct PortableModel {
+    pub path: PathBuf,
+    pub page_count: usize,
+    pub layout: PageLayout,
+}
diff --git a/src/document/model/raster.rs b/src/document/model/raster.rs
new file mode 100644
index 0000000..83228bc
--- /dev/null
+++ b/src/document/model/raster.rs
@@ -0,0 +1,12 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// src/document/model/raster.rs
+//
+// Raster image document model (JPEG, PNG, etc.).
+
+use std::path::PathBuf;
+
+#[derive(Clone, Debug)]
+pub struct RasterModel {
+    pub path: PathBuf,
+    pub dimensions: (u32, u32),
+}
diff --git a/src/document/model/vector.rs b/src/document/model/vector.rs
new file mode 100644
index 0000000..15e9bf9
--- /dev/null
+++ b/src/document/model/vector.rs
@@ -0,0 +1,13 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// src/document/model/vector.rs
+//
+// Vector image document model (SVG).
+
+use crate::document::types::ViewBox;
+use std::path::PathBuf;
+
+#[derive(Clone, Debug)]
+pub struct VectorModel {
+    pub path: PathBuf,
+    pub view_box: Option<ViewBox>,
+}
diff --git a/src/document/session/command.rs b/src/document/session/command.rs
new file mode 100644
index 0000000..4b74877
--- /dev/null
+++ b/src/document/session/command.rs
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// src/document/session/command.rs
+//
+// Commands that operate on sessions and their document collections.
+
+use std::path::PathBuf;
+
+/// Commands operating on sessions and their document collections.
+///
+/// Two implicit cursors exist in the manager:
+/// - `active_session_index` – the currently active session
+/// - `active_document_index` – the currently active document within that session
+///
+/// `SelectSession` and `SelectDocument` set these cursors. All commands that
+/// do not carry an explicit target operate on the active cursor.
+///
+/// Only `DocumentCollection` sessions are user-managed. The single
+/// `DirectoryBrowser` session is created by the UI and cannot be closed,
+/// renamed, or removed.
+#[derive(Debug, Clone)]
+pub enum SessionCommand {
+    // Session lifecycle
+    /// Create a new empty `DocumentCollection` session.
+    NewSession { name: String },
+    /// Load sessions from an existing .ron file.
+    OpenSession { path: PathBuf },
+    /// Persist all sessions to the .ron file.
+    SaveSession,
+    /// Set the active session cursor by name.
+    SelectSession { name: String },
+    /// Duplicate the active session as a new `DocumentCollection`.
+    ///
+    /// When the source is a `DirectoryBrowser` this produces a snapshot:
+    /// the current items are copied into a new `DocumentCollection`.
+    DuplicateSession { new_name: String },
+    /// Delete the active `DocumentCollection` session permanently (removed from .ron on save).
+    DeleteSession,
+    /// Rename the active `DocumentCollection` session.
+    RenameSession { name: String },
+
+    // Collection management within the active session
+    /// Scan a directory and populate the active `DirectoryBrowser` session.
+    AddDirectoryToSession { dir: PathBuf },
+    /// Add a single document to the active `DocumentCollection` session.
+    AddDocumentToSession { path: PathBuf },
+
+    // Document management within the active session
+    /// Set the active document cursor by index.
+    SelectDocument { index: usize },
+    /// Copy the active document into the clipboard.
+    CopyDocument,
+    /// Paste the clipboard item at the end of the active session.
+    PasteDocument,
+    /// Remove the active document from the active session.
+    RemoveDocument,
+    /// Move the active document cursor to the next item.
+    NextDocument,
+    /// Move the active document cursor to the previous item.
+    PreviousDocument,
+    /// Move the active document one position towards the front.
+    MoveDocumentUp,
+    /// Move the active document one position towards the back.
+    MoveDocumentDown,
+    /// Move the active document to an explicit position.
+    MoveDocumentTo { index: usize },
+}
diff --git a/src/document/session/data.rs b/src/document/session/data.rs
new file mode 100644
index 0000000..9697fdd
--- /dev/null
+++ b/src/document/session/data.rs
@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// src/document/session/data.rs
+//
+// Pure data structures for sessions and their document items.
+//
+// Operational state (active session cursor, active document cursor, clipboard)
+// lives in the manager, not here. This module contains only what is persisted.
+
+use serde::{Deserialize, Serialize};
+use std::path::PathBuf;
+
+/// Determines how a session's items are managed.
+///
+/// A `DirectoryBrowser` session is created once by the UI and cannot be closed
+/// or removed by the user. It can be duplicated via `DuplicateSession`, which
+/// produces a new `DocumentCollection` containing a snapshot of the current items.
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub enum CollectionKind {
+    /// Items are derived from a directory scan; `path` holds the source directory.
+    DirectoryBrowser,
+    /// Items are a curated list of documents or pages; `path` is None.
+    DocumentCollection,
+}
+
+/// A single entry in a session – a file path and an optional page within that file.
+///
+/// `page_index` is 0 for single-page formats (raster, SVG) and non-zero for
+/// multi-page documents (PDF, multi-frame TIFF) where each page is its own item.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SessionItem {
+    pub path: PathBuf,
+    pub page_index: usize,
+}
+
+impl SessionItem {
+    #[must_use]
+    pub fn new(path: PathBuf, page_index: usize) -> Self {
+        Self { path, page_index }
+    }
+}
+
+/// The persistable state of a single session.
+///
+/// Operational state (active document index, clipboard) lives in the manager.
+/// This struct is serialized as-is to the RON session file.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct SessionData {
+    pub name: String,
+    pub kind: CollectionKind,
+    /// For `DirectoryBrowser`: the source directory to scan.
+    /// For `DocumentCollection`: `None` (items are managed individually).
+    #[serde(default)]
+    pub path: Option<PathBuf>,
+    pub items: Vec<SessionItem>,
+}
+
+impl SessionData {
+    #[must_use]
+    pub fn new(
+        name: &str,
+        kind: CollectionKind,
+        path: Option<PathBuf>,
+        items: Vec<SessionItem>,
+    ) -> Self {
+        Self {
+            name: name.to_string(),
+            kind,
+            path,
+            items,
+        }
+    }
+}
diff --git a/src/document/session/mod.rs b/src/document/session/mod.rs
new file mode 100644
index 0000000..5d25ca6
--- /dev/null
+++ b/src/document/session/mod.rs
@@ -0,0 +1,8 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// src/document/session/mod.rs
+//
+// Session subsystem: data model, commands, and persistence.
+
+pub mod command;
+pub mod data;
+pub mod store;
diff --git a/src/document/session/store.rs b/src/document/session/store.rs
new file mode 100644
index 0000000..9d00c3c
--- /dev/null
+++ b/src/document/session/store.rs
@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// src/document/session/store.rs
+//
+// RON-based persistence for session data: load and save session lists.
+//
+// For the session concept and the meaning of each field see `session.rs`.
+//
+// On disk a session file contains a RON list of SessionData records:
+//
+// [
+//     (
+//         name: "Pictures",
+//         kind: DirectoryBrowser,
+//         path: Some("/home/user/Pictures"),
+//         items: [],
+//         current_index: None,
+//     ),
+//     (
+//         name: "Project Docs",
+//         kind: DocumentCollection,
+//         path: None,
+//         items: [
+//             (path: "/home/user/docs/spec.pdf",  page_index: 0),
+//             (path: "/home/user/docs/notes.pdf", page_index: 2),
+//         ],
+//         current_index: Some(0),
+//     ),
+// ]
+
+use crate::document::session::data::SessionData;
+use crate::error::{Error, Result};
+use std::path::Path;
+
+/// Loads all sessions from a RON file.
+///
+/// # Errors
+///
+/// Returns [`Error::Io`] if the file cannot be read.
+/// Returns [`Error::Session`] if the file cannot be parsed.
+pub fn load_sessions(path: &Path) -> Result<Vec<SessionData>> {
+    let content = std::fs::read_to_string(path).map_err(Error::Io)?;
+
+    ron::from_str(&content).map_err(|e| {
+        Error::Session(format!(
+            "Failed to parse session file {}: {e}",
+            path.display()
+        ))
+    })
+}
+
+/// Saves all sessions to a RON file.
+///
+/// # Errors
+///
+/// Returns [`Error::Session`] if the sessions cannot be serialized.
+/// Returns [`Error::Io`] if the file cannot be written.
+pub fn save_sessions(path: &Path, sessions: &[SessionData]) -> Result<()> {
+    let content = ron::ser::to_string_pretty(sessions, ron::ser::PrettyConfig::default())
+        .map_err(|e| Error::Session(format!("Failed to serialize sessions: {e}")))?;
+
+    std::fs::write(path, content).map_err(Error::Io)
+}
diff --git a/src/document/types/image.rs b/src/document/types/image.rs
new file mode 100644
index 0000000..3791631
--- /dev/null
+++ b/src/document/types/image.rs
@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// src/document/types/image.rs
+//
+// Raw pixel buffer passed from the render subsystem to the UI.
+
+use std::sync::Arc;
+
+/// A decoded, format-independent pixel buffer ready for display.
+///
+/// The UI receives this type from the `DocumentManager` and never needs to
+/// know which document format (PDF, SVG, raster) produced it.
+#[derive(Clone, Debug)]
+pub struct RawImage {
+    pub data: Arc<Vec<u8>>,
+    pub width: u32,
+    pub height: u32,
+}
diff --git a/src/document/types/layout.rs b/src/document/types/layout.rs
new file mode 100644
index 0000000..e86628d
--- /dev/null
+++ b/src/document/types/layout.rs
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// src/document/types/layout.rs
+//
+// PageLayout – describes the vertical arrangement of pages in a document.
+
+/// The computed layout of all pages in a multi-page document.
+///
+/// Stores absolute y-offsets for each page so the render subsystem can
+/// determine which pages are visible at a given scroll position without
+/// iterating the full list on every frame.
+#[derive(Clone, Debug)]
+pub struct PageLayout {
+    pub page_starts: Vec<f64>,
+    pub page_sizes: Vec<(f64, f64)>,
+    pub gap: f64,
+    pub total_height: f64,
+    pub max_width: f64,
+}
+
+impl PageLayout {
+    #[must_use]
+    pub fn new(page_sizes: Vec<(f64, f64)>, gap: f64) -> Self {
+        let mut page_starts = Vec::with_capacity(page_sizes.len());
+        let mut y = 0.0_f64;
+        let mut max_width = 0.0_f64;
+
+        for &(w, h) in &page_sizes {
+            page_starts.push(y);
+            y += h + gap;
+            if w > max_width {
+                max_width = w;
+            }
+        }
+
+        let total_height = if page_sizes.is_empty() { 0.0 } else { y - gap };
+
+        Self {
+            page_starts,
+            page_sizes,
+            gap,
+            total_height,
+            max_width,
+        }
+    }
+}
diff --git a/src/document/types/mod.rs b/src/document/types/mod.rs
new file mode 100644
index 0000000..7a5f836
--- /dev/null
+++ b/src/document/types/mod.rs
@@ -0,0 +1,11 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// src/document/types/mod.rs
+//
+// Shared domain primitives used across the document and render subsystems.
+
+pub mod image;
+pub mod layout;
+pub mod viewbox;
+
+pub use layout::PageLayout;
+pub use viewbox::ViewBox;
diff --git a/src/document/types/viewbox.rs b/src/document/types/viewbox.rs
new file mode 100644
index 0000000..45715c6
--- /dev/null
+++ b/src/document/types/viewbox.rs
@@ -0,0 +1,16 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// src/document/types/viewbox.rs
+//
+// ViewBox – describes the visible coordinate space of a vector document.
+
+/// The coordinate space declared by an SVG `viewBox` attribute.
+///
+/// Used by the render subsystem to map document coordinates to screen pixels
+/// without exposing SVG internals to the UI.
+#[derive(Clone, Debug)]
+pub struct ViewBox {
+    pub x: f64,
+    pub y: f64,
+    pub width: f64,
+    pub height: f64,
+}
diff --git a/src/domain/document/collection.rs b/src/domain/document/collection.rs
deleted file mode 100644
index 43c4c09..0000000
--- a/src/domain/document/collection.rs
+++ /dev/null
@@ -1,277 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/domain/document/collection.rs
-//
-// Document collection for managing multiple documents.
-
-use std::path::PathBuf;
-
-use crate::domain::document::core::content::DocumentContent;
-
-/// A collection of documents with navigation support.
-///
-/// This abstraction is useful for:
-/// - Browsing through folders of images
-/// - Batch operations on multiple documents
-/// - Comparison views (showing multiple documents side-by-side)
-#[derive(Debug)]
-pub struct DocumentCollection {
-    /// List of document paths in the collection.
-    paths: Vec<PathBuf>,
-    /// Currently active document index.
-    current_index: Option<usize>,
-    /// Currently loaded document (lazy-loaded).
-    current_document: Option<DocumentContent>,
-}
-
-impl DocumentCollection {
-    /// Create an empty collection.
-    #[must_use]
-    pub fn new() -> Self {
-        Self {
-            paths: Vec::new(),
-            current_index: None,
-            current_document: None,
-        }
-    }
-
-    /// Create a collection from a list of paths.
-    #[must_use]
-    pub fn from_paths(paths: Vec<PathBuf>) -> Self {
-        let current_index = if paths.is_empty() { None } else { Some(0) };
-
-        Self {
-            paths,
-            current_index,
-            current_document: None,
-        }
-    }
-
-    /// Get the number of documents in the collection.
-    #[must_use]
-    pub fn len(&self) -> usize {
-        self.paths.len()
-    }
-
-    /// Check if the collection is empty.
-    #[must_use]
-    pub fn is_empty(&self) -> bool {
-        self.paths.is_empty()
-    }
-
-    /// Get the current document index (0-based).
-    #[must_use]
-    pub fn current_index(&self) -> Option<usize> {
-        self.current_index
-    }
-
-    /// Get the current document path.
-    #[must_use]
-    pub fn current_path(&self) -> Option<&PathBuf> {
-        self.current_index.and_then(|idx| self.paths.get(idx))
-    }
-
-    /// Get all paths in the collection.
-    #[must_use]
-    pub fn paths(&self) -> &[PathBuf] {
-        &self.paths
-    }
-
-    /// Get a reference to the currently loaded document.
-    #[must_use]
-    pub fn current_document(&self) -> Option<&DocumentContent> {
-        self.current_document.as_ref()
-    }
-
-    /// Get a mutable reference to the currently loaded document.
-    #[must_use]
-    pub fn current_document_mut(&mut self) -> Option<&mut DocumentContent> {
-        self.current_document.as_mut()
-    }
-
-    /// Set the currently loaded document.
-    pub fn set_current_document(&mut self, document: DocumentContent) {
-        self.current_document = Some(document);
-    }
-
-    /// Clear the currently loaded document.
-    pub fn clear_current_document(&mut self) {
-        self.current_document = None;
-    }
-
-    /// Navigate to the next document in the collection.
-    ///
-    /// Returns the new index if successful, None if already at the end.
-    pub fn next(&mut self) -> Option<usize> {
-        if let Some(current) = self.current_index
-            && current + 1 < self.paths.len()
-        {
-            self.current_index = Some(current + 1);
-            self.current_document = None; // Clear document (needs reload)
-            return self.current_index;
-        }
-        None
-    }
-
-    /// Navigate to the previous document in the collection.
-    ///
-    /// Returns the new index if successful, None if already at the start.
-    pub fn previous(&mut self) -> Option<usize> {
-        if let Some(current) = self.current_index
-            && current > 0
-        {
-            self.current_index = Some(current - 1);
-            self.current_document = None; // Clear document (needs reload)
-            return self.current_index;
-        }
-        None
-    }
-
-    /// Navigate to a specific index.
-    ///
-    /// Returns true if the index is valid and navigation succeeded.
-    pub fn goto(&mut self, index: usize) -> bool {
-        if index < self.paths.len() {
-            self.current_index = Some(index);
-            self.current_document = None; // Clear document (needs reload)
-            true
-        } else {
-            false
-        }
-    }
-
-    /// Add a document path to the collection.
-    pub fn add_path(&mut self, path: PathBuf) {
-        self.paths.push(path);
-        if self.current_index.is_none() {
-            self.current_index = Some(0);
-        }
-    }
-
-    /// Remove a document path at the given index.
-    ///
-    /// Returns the removed path if successful.
-    pub fn remove_at(&mut self, index: usize) -> Option<PathBuf> {
-        if index < self.paths.len() {
-            let removed = self.paths.remove(index);
-
-            // Update current index if needed
-            if let Some(current) = self.current_index {
-                if current == index {
-                    // Removed current document
-                    self.current_document = None;
-                    if self.paths.is_empty() {
-                        self.current_index = None;
-                    } else if current >= self.paths.len() {
-                        self.current_index = Some(self.paths.len() - 1);
-                    }
-                } else if current > index {
-                    // Adjust index after removal
-                    self.current_index = Some(current - 1);
-                }
-            }
-
-            Some(removed)
-        } else {
-            None
-        }
-    }
-
-    /// Clear the entire collection.
-    pub fn clear(&mut self) {
-        self.paths.clear();
-        self.current_index = None;
-        self.current_document = None;
-    }
-
-    /// Check if there is a next document available.
-    #[must_use]
-    pub fn has_next(&self) -> bool {
-        if let Some(current) = self.current_index {
-            current + 1 < self.paths.len()
-        } else {
-            false
-        }
-    }
-
-    /// Check if there is a previous document available.
-    #[must_use]
-    pub fn has_previous(&self) -> bool {
-        if let Some(current) = self.current_index {
-            current > 0
-        } else {
-            false
-        }
-    }
-
-    /// Get the path at a specific index.
-    #[must_use]
-    pub fn path_at(&self, index: usize) -> Option<&PathBuf> {
-        self.paths.get(index)
-    }
-}
-
-impl Default for DocumentCollection {
-    fn default() -> Self {
-        Self::new()
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_empty_collection() {
-        let collection = DocumentCollection::new();
-        assert!(collection.is_empty());
-        assert_eq!(collection.len(), 0);
-        assert_eq!(collection.current_index(), None);
-    }
-
-    #[test]
-    fn test_navigation() {
-        let paths = vec![
-            PathBuf::from("a.png"),
-            PathBuf::from("b.png"),
-            PathBuf::from("c.png"),
-        ];
-        let mut collection = DocumentCollection::from_paths(paths);
-
-        assert_eq!(collection.current_index(), Some(0));
-        assert_eq!(collection.next(), Some(1));
-        assert_eq!(collection.next(), Some(2));
-        assert_eq!(collection.next(), None); // At end
-        assert_eq!(collection.previous(), Some(1));
-        assert_eq!(collection.previous(), Some(0));
-        assert_eq!(collection.previous(), None); // At start
-    }
-
-    #[test]
-    fn test_goto() {
-        let paths = vec![
-            PathBuf::from("a.png"),
-            PathBuf::from("b.png"),
-            PathBuf::from("c.png"),
-        ];
-        let mut collection = DocumentCollection::from_paths(paths);
-
-        assert!(collection.goto(2));
-        assert_eq!(collection.current_index(), Some(2));
-        assert!(!collection.goto(10)); // Invalid index
-    }
-
-    #[test]
-    fn test_remove() {
-        let paths = vec![
-            PathBuf::from("a.png"),
-            PathBuf::from("b.png"),
-            PathBuf::from("c.png"),
-        ];
-        let mut collection = DocumentCollection::from_paths(paths);
-
-        collection.goto(1);
-        assert_eq!(collection.remove_at(1), Some(PathBuf::from("b.png")));
-        assert_eq!(collection.len(), 2);
-        assert_eq!(collection.current_index(), Some(1)); // Now points to c.png
-    }
-}
diff --git a/src/domain/document/core/content.rs b/src/domain/document/core/content.rs
deleted file mode 100644
index 3cdf26c..0000000
--- a/src/domain/document/core/content.rs
+++ /dev/null
@@ -1,403 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/domain/document/core/content.rs
-//
-// Type-erased document content enum.
-
-use std::fmt;
-use std::path::Path;
-
-use cosmic::iced_renderer::graphics::image::image_rs::ImageFormat as CosmicImageFormat;
-use cosmic::widget::image::Handle as ImageHandle;
-
-use super::document::{
-    DocResult, DocumentInfo, FlipDirection, InterpolationQuality, MultiPage, MultiPageThumbnails,
-    RenderOutput, Renderable, Rotation, RotationMode, Transformable, TransformState,
-};
-
-use crate::domain::document::types::raster::RasterDocument;
-#[cfg(feature = "vector")]
-use crate::domain::document::types::vector::VectorDocument;
-#[cfg(feature = "portable")]
-use crate::domain::document::types::portable::PortableDocument;
-
-// ============================================================================
-// Document Kind
-// ============================================================================
-
-/// Supported document kinds (for format detection).
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub enum DocumentKind {
-    Raster,
-    Vector,
-    Portable,
-}
-
-impl DocumentKind {
-    /// Detect document kind from file path.
-    #[must_use]
-    pub fn from_path(path: &Path) -> Option<Self> {
-        let ext = path.extension()?.to_str()?.to_lowercase();
-
-        // SVG
-        #[cfg(feature = "vector")]
-        if ext == "svg" || ext == "svgz" {
-            return Some(Self::Vector);
-        }
-
-        // PDF
-        #[cfg(feature = "portable")]
-        if ext == "pdf" {
-            return Some(Self::Portable);
-        }
-
-        // Raster: Check via cosmic/image-rs
-        if CosmicImageFormat::from_path(path).is_ok() {
-            return Some(Self::Raster);
-        }
-
-        None
-    }
-}
-
-impl fmt::Display for DocumentKind {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            Self::Raster => write!(f, "Raster"),
-            Self::Vector => write!(f, "Vector"),
-            Self::Portable => write!(f, "Portable"),
-        }
-    }
-}
-
-// ============================================================================
-// Document Content Enum
-// ============================================================================
-
-/// Type-erased document content.
-///
-/// The application only holds one document at a time, so the size difference
-/// between variants is acceptable. Boxing would add unnecessary indirection.
-#[allow(clippy::large_enum_variant)]
-pub enum DocumentContent {
-    Raster(RasterDocument),
-    #[cfg(feature = "vector")]
-    Vector(VectorDocument),
-    #[cfg(feature = "portable")]
-    Portable(PortableDocument),
-}
-
-impl fmt::Debug for DocumentContent {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        match self {
-            Self::Raster(_) => write!(f, "DocumentContent::Raster(...)"),
-            #[cfg(feature = "vector")]
-            Self::Vector(_) => write!(f, "DocumentContent::Vector(...)"),
-            #[cfg(feature = "portable")]
-            Self::Portable(_) => write!(f, "DocumentContent::Portable(...)"),
-        }
-    }
-}
-
-// ============================================================================
-// Trait Implementations
-// ============================================================================
-
-impl Renderable for DocumentContent {
-    fn render(&mut self, scale: f64) -> DocResult<RenderOutput> {
-        match self {
-            Self::Raster(doc) => doc.render(scale),
-            #[cfg(feature = "vector")]
-            Self::Vector(doc) => doc.render(scale),
-            #[cfg(feature = "portable")]
-            Self::Portable(doc) => doc.render(scale),
-        }
-    }
-
-    fn info(&self) -> DocumentInfo {
-        match self {
-            Self::Raster(doc) => doc.info(),
-            #[cfg(feature = "vector")]
-            Self::Vector(doc) => doc.info(),
-            #[cfg(feature = "portable")]
-            Self::Portable(doc) => doc.info(),
-        }
-    }
-}
-
-impl Transformable for DocumentContent {
-    fn rotate(&mut self, rotation: Rotation) {
-        match self {
-            Self::Raster(doc) => doc.rotate(rotation),
-            #[cfg(feature = "vector")]
-            Self::Vector(doc) => doc.rotate(rotation),
-            #[cfg(feature = "portable")]
-            Self::Portable(doc) => doc.rotate(rotation),
-        }
-    }
-
-    fn flip(&mut self, direction: FlipDirection) {
-        match self {
-            Self::Raster(doc) => doc.flip(direction),
-            #[cfg(feature = "vector")]
-            Self::Vector(doc) => doc.flip(direction),
-            #[cfg(feature = "portable")]
-            Self::Portable(doc) => doc.flip(direction),
-        }
-    }
-
-    fn transform_state(&self) -> TransformState {
-        match self {
-            Self::Raster(doc) => doc.transform_state(),
-            #[cfg(feature = "vector")]
-            Self::Vector(doc) => doc.transform_state(),
-            #[cfg(feature = "portable")]
-            Self::Portable(doc) => doc.transform_state(),
-        }
-    }
-
-    fn rotate_fine(&mut self, angle_degrees: f32) {
-        match self {
-            Self::Raster(doc) => doc.rotate_fine(angle_degrees),
-            #[cfg(feature = "vector")]
-            Self::Vector(doc) => doc.rotate_fine(angle_degrees),
-            #[cfg(feature = "portable")]
-            Self::Portable(doc) => doc.rotate_fine(angle_degrees),
-        }
-    }
-
-    fn reset_fine_rotation(&mut self) {
-        match self {
-            Self::Raster(doc) => doc.reset_fine_rotation(),
-            #[cfg(feature = "vector")]
-            Self::Vector(doc) => doc.reset_fine_rotation(),
-            #[cfg(feature = "portable")]
-            Self::Portable(doc) => doc.reset_fine_rotation(),
-        }
-    }
-
-    fn set_interpolation_quality(&mut self, quality: InterpolationQuality) {
-        match self {
-            Self::Raster(doc) => doc.set_interpolation_quality(quality),
-            #[cfg(feature = "vector")]
-            Self::Vector(doc) => doc.set_interpolation_quality(quality),
-            #[cfg(feature = "portable")]
-            Self::Portable(doc) => doc.set_interpolation_quality(quality),
-        }
-    }
-}
-
-// ============================================================================
-// Convenience Methods
-// ============================================================================
-
-impl DocumentContent {
-    /// Rotate document 90 degrees clockwise.
-    pub fn rotate_cw(&mut self) {
-        let new_rotation_mode = self.transform_state().rotation.rotate_cw();
-        match new_rotation_mode {
-            RotationMode::Standard(rot) => self.rotate(rot),
-            RotationMode::Fine(deg) => {
-                let normalized = ((deg / 90.0).round() as i16 * 90) % 360;
-                let rot = match normalized {
-                    0 => Rotation::None,
-                    90 => Rotation::Cw90,
-                    180 => Rotation::Cw180,
-                    270 => Rotation::Cw270,
-                    _ => Rotation::None,
-                };
-                self.rotate(rot);
-            }
-        }
-    }
-
-    /// Rotate document 90 degrees counter-clockwise.
-    pub fn rotate_ccw(&mut self) {
-        let new_rotation_mode = self.transform_state().rotation.rotate_ccw();
-        match new_rotation_mode {
-            RotationMode::Standard(rot) => self.rotate(rot),
-            RotationMode::Fine(deg) => {
-                let normalized = ((deg / 90.0).round() as i16 * 90 + 360) % 360;
-                let rot = match normalized {
-                    0 => Rotation::None,
-                    90 => Rotation::Cw90,
-                    180 => Rotation::Cw180,
-                    270 => Rotation::Cw270,
-                    _ => Rotation::None,
-                };
-                self.rotate(rot);
-            }
-        }
-    }
-
-    /// Flip document horizontally.
-    pub fn flip_horizontal(&mut self) {
-        self.flip(FlipDirection::Horizontal);
-    }
-
-    /// Flip document vertically.
-    pub fn flip_vertical(&mut self) {
-        self.flip(FlipDirection::Vertical);
-    }
-
-    /// Get the document kind.
-    #[must_use]
-    pub fn kind(&self) -> DocumentKind {
-        match self {
-            Self::Raster(_) => DocumentKind::Raster,
-            #[cfg(feature = "vector")]
-            Self::Vector(_) => DocumentKind::Vector,
-            #[cfg(feature = "portable")]
-            Self::Portable(_) => DocumentKind::Portable,
-        }
-    }
-
-    /// Check if document supports multiple pages.
-    #[must_use]
-    pub fn is_multi_page(&self) -> bool {
-        matches!(self, Self::Portable(_))
-    }
-
-    /// Get total page count (returns 1 for single-page documents).
-    #[must_use]
-    pub fn page_count(&self) -> usize {
-        match self {
-            #[cfg(feature = "portable")]
-            Self::Portable(doc) => doc.page_count(),
-            _ => 1,
-        }
-    }
-
-    /// Get current page index (0 for single-page documents).
-    #[must_use]
-    pub fn current_page(&self) -> usize {
-        match self {
-            #[cfg(feature = "portable")]
-            Self::Portable(doc) => doc.current_page(),
-            _ => 0,
-        }
-    }
-
-    /// Navigate to a specific page (no-op for single-page documents).
-    pub fn go_to_page(&mut self, page: usize) -> DocResult<()> {
-        match self {
-            #[cfg(feature = "portable")]
-            Self::Portable(doc) => doc.go_to_page(page),
-            _ => Ok(()),
-        }
-    }
-
-    /// Get thumbnail for a specific page (mutable access for trait compatibility).
-    pub fn get_thumbnail(&mut self, page: usize) -> DocResult<Option<ImageHandle>> {
-        match self {
-            #[cfg(feature = "portable")]
-            Self::Portable(doc) => doc.get_thumbnail(page),
-            _ => Ok(None),
-        }
-    }
-
-    /// Get thumbnail handle for a specific page (read-only access).
-    /// Returns None if the thumbnail hasn't been generated yet.
-    #[must_use]
-    pub fn get_thumbnail_handle(&self, page: usize) -> Option<ImageHandle> {
-        match self {
-            #[cfg(feature = "portable")]
-            Self::Portable(doc) => doc.get_thumbnail_handle(page),
-            _ => None,
-        }
-    }
-
-    /// Check if thumbnails are ready to be generated.
-    #[must_use]
-    pub fn thumbnails_ready(&self) -> bool {
-        match self {
-            #[cfg(feature = "portable")]
-            Self::Portable(doc) => doc.thumbnails_ready(),
-            _ => false,
-        }
-    }
-
-    /// Get count of thumbnails currently loaded.
-    #[must_use]
-    pub fn thumbnails_loaded(&self) -> usize {
-        match self {
-            #[cfg(feature = "portable")]
-            Self::Portable(doc) => PortableDocument::thumbnails_loaded(doc),
-            _ => 0,
-        }
-    }
-
-    /// Check if all thumbnails have been loaded (trait-compliant).
-    #[must_use]
-    pub fn all_thumbnails_loaded(&self) -> bool {
-        match self {
-            #[cfg(feature = "portable")]
-            Self::Portable(doc) => MultiPageThumbnails::thumbnails_loaded(doc),
-            _ => false,
-        }
-    }
-
-    /// Generate thumbnail for a specific page.
-    pub fn generate_thumbnail_page(&mut self, page: usize) -> DocResult<()> {
-        match self {
-            #[cfg(feature = "portable")]
-            Self::Portable(doc) => MultiPageThumbnails::generate_thumbnail_page(doc, page),
-            _ => Ok(()),
-        }
-    }
-
-    /// Generate all thumbnails.
-    pub fn generate_thumbnails(&mut self) -> DocResult<()> {
-        match self {
-            #[cfg(feature = "portable")]
-            Self::Portable(doc) => MultiPageThumbnails::generate_all_thumbnails(doc),
-            _ => Ok(()),
-        }
-    }
-
-    /// Get the current rendered image handle.
-    #[must_use]
-    pub fn handle(&self) -> Option<ImageHandle> {
-        match self {
-            Self::Raster(doc) => Some(doc.handle()),
-            #[cfg(feature = "vector")]
-            Self::Vector(doc) => Some(doc.handle()),
-            #[cfg(feature = "portable")]
-            Self::Portable(doc) => Some(doc.handle()),
-        }
-    }
-
-    /// Get current dimensions after transformations.
-    #[must_use]
-    pub fn dimensions(&self) -> (u32, u32) {
-        match self {
-            Self::Raster(doc) => doc.dimensions(),
-            #[cfg(feature = "vector")]
-            Self::Vector(doc) => doc.dimensions(),
-            #[cfg(feature = "portable")]
-            Self::Portable(doc) => doc.dimensions(),
-        }
-    }
-
-    /// Crop the document (supported for all types - works on rendered output).
-    pub fn crop(&mut self, x: u32, y: u32, width: u32, height: u32) -> DocResult<()> {
-        match self {
-            Self::Raster(doc) => doc.crop(x, y, width, height).map_err(|e| anyhow::anyhow!(e)),
-            #[cfg(feature = "vector")]
-            Self::Vector(doc) => doc.crop(x, y, width, height).map_err(|e| anyhow::anyhow!(e)),
-            #[cfg(feature = "portable")]
-            Self::Portable(doc) => doc.crop(x, y, width, height).map_err(|e| anyhow::anyhow!(e)),
-        }
-    }
-
-    /// Extract document metadata (basic info and EXIF if available).
-    #[must_use]
-    pub fn extract_meta(&self, path: &Path) -> crate::domain::document::core::metadata::DocumentMeta {
-        match self {
-            Self::Raster(doc) => doc.extract_meta(path),
-            #[cfg(feature = "vector")]
-            Self::Vector(doc) => doc.extract_meta(path),
-            #[cfg(feature = "portable")]
-            Self::Portable(doc) => doc.extract_meta(path),
-        }
-    }
-}
diff --git a/src/domain/document/core/document.rs b/src/domain/document/core/document.rs
deleted file mode 100644
index 3e1fdd7..0000000
--- a/src/domain/document/core/document.rs
+++ /dev/null
@@ -1,250 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/domain/document/core/document.rs
-//
-// Core document traits and abstractions.
-
-use cosmic::widget::image::Handle as ImageHandle;
-
-// ============================================================================
-// Type Definitions
-// ============================================================================
-
-/// Result type alias for document operations.
-pub type DocResult<T> = anyhow::Result<T>;
-
-/// Rotation state for documents.
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
-pub enum Rotation {
-    /// No rotation (0 degrees).
-    #[default]
-    None,
-    /// 90 degrees clockwise.
-    Cw90,
-    /// 180 degrees.
-    Cw180,
-    /// 270 degrees clockwise (90 counter-clockwise).
-    Cw270,
-}
-
-impl Rotation {
-    /// Rotate clockwise by 90 degrees.
-    #[must_use]
-    pub fn rotate_cw(self) -> Self {
-        match self {
-            Self::None => Self::Cw90,
-            Self::Cw90 => Self::Cw180,
-            Self::Cw180 => Self::Cw270,
-            Self::Cw270 => Self::None,
-        }
-    }
-
-    /// Rotate counter-clockwise by 90 degrees.
-    #[must_use]
-    pub fn rotate_ccw(self) -> Self {
-        match self {
-            Self::None => Self::Cw270,
-            Self::Cw270 => Self::Cw180,
-            Self::Cw180 => Self::Cw90,
-            Self::Cw90 => Self::None,
-        }
-    }
-
-    /// Convert to degrees (0, 90, 180, 270).
-    #[must_use]
-    pub fn to_degrees(self) -> i16 {
-        match self {
-            Self::None => 0,
-            Self::Cw90 => 90,
-            Self::Cw180 => 180,
-            Self::Cw270 => 270,
-        }
-    }
-}
-
-/// Rotation mode: standard 90° steps or fine-grained rotation.
-#[derive(Debug, Clone, Copy, PartialEq)]
-pub enum RotationMode {
-    /// Standard 90° rotation (lossless for most formats).
-    Standard(Rotation),
-    /// Fine-grained rotation in degrees (0.0 - 360.0) with interpolation.
-    Fine(f32),
-}
-
-impl Default for RotationMode {
-    fn default() -> Self {
-        Self::Standard(Rotation::None)
-    }
-}
-
-impl RotationMode {
-    /// Convert rotation to degrees (0.0 - 360.0).
-    #[must_use]
-    pub fn to_degrees(self) -> f32 {
-        match self {
-            Self::Standard(r) => f32::from(r.to_degrees()),
-            Self::Fine(deg) => deg,
-        }
-    }
-
-    /// Check if rotation is a multiple of 90 degrees.
-    #[must_use]
-    pub fn is_multiple_of_90(self) -> bool {
-        match self {
-            Self::Standard(_) => true,
-            Self::Fine(deg) => (deg % 90.0).abs() < 0.01,
-        }
-    }
-
-    /// Check if no rotation is applied.
-    #[must_use]
-    pub fn is_none(self) -> bool {
-        match self {
-            Self::Standard(Rotation::None) => true,
-            Self::Standard(_) => false,
-            Self::Fine(deg) => deg.abs() < 0.01,
-        }
-    }
-
-    /// Rotate clockwise by 90 degrees.
-    #[must_use]
-    pub fn rotate_cw(self) -> Self {
-        match self {
-            Self::Standard(r) => Self::Standard(r.rotate_cw()),
-            Self::Fine(deg) => Self::Fine((deg + 90.0) % 360.0),
-        }
-    }
-
-    /// Rotate counter-clockwise by 90 degrees.
-    #[must_use]
-    pub fn rotate_ccw(self) -> Self {
-        match self {
-            Self::Standard(r) => Self::Standard(r.rotate_ccw()),
-            Self::Fine(deg) => Self::Fine((deg - 90.0 + 360.0) % 360.0),
-        }
-    }
-}
-
-/// Interpolation quality for fine rotation and resizing operations.
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
-#[allow(dead_code)]
-pub enum InterpolationQuality {
-    /// Fast, nearest neighbor interpolation.
-    Fast,
-    /// Balanced bilinear interpolation (default).
-    #[default]
-    Balanced,
-    /// Best quality, bicubic interpolation.
-    Best,
-}
-
-/// Flip direction for documents.
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub enum FlipDirection {
-    /// Flip along the vertical axis (mirror left-right).
-    Horizontal,
-    /// Flip along the horizontal axis (mirror top-bottom).
-    Vertical,
-}
-
-/// Current transformation state of a document.
-#[derive(Debug, Clone, Copy, Default, PartialEq)]
-pub struct TransformState {
-    /// Current rotation mode (standard 90° or fine rotation).
-    pub rotation: RotationMode,
-    /// Whether flipped horizontally.
-    pub flip_h: bool,
-    /// Whether flipped vertically.
-    pub flip_v: bool,
-}
-
-/// Output of a render operation.
-#[derive(Debug, Clone)]
-pub struct RenderOutput {
-    /// Image handle for display.
-    pub handle: ImageHandle,
-    /// Rendered width in pixels.
-    pub width: u32,
-    /// Rendered height in pixels.
-    pub height: u32,
-}
-
-/// Document metadata/information.
-#[derive(Debug, Clone)]
-pub struct DocumentInfo {
-    /// Native width in pixels (before transforms).
-    pub width: u32,
-    /// Native height in pixels (before transforms).
-    pub height: u32,
-    /// Document format description.
-    pub format: String,
-}
-
-// ============================================================================
-// Traits
-// ============================================================================
-
-/// Trait for documents that can be rendered to an image.
-pub trait Renderable {
-    /// Render the document at the given scale factor.
-    fn render(&mut self, scale: f64) -> DocResult<RenderOutput>;
-
-    /// Get document information (dimensions, format).
-    fn info(&self) -> DocumentInfo;
-}
-
-/// Trait for documents that support geometric transformations.
-pub trait Transformable {
-    /// Apply a standard 90° rotation.
-    fn rotate(&mut self, rotation: Rotation);
-
-    /// Flip in the given direction.
-    fn flip(&mut self, direction: FlipDirection);
-
-    /// Get the current transformation state.
-    fn transform_state(&self) -> TransformState;
-
-    /// Apply fine-grained rotation in degrees (0.0 - 360.0).
-    fn rotate_fine(&mut self, _angle_degrees: f32) {
-        // Default: no-op (not all formats support fine rotation)
-    }
-
-    /// Reset any accumulated fine rotation.
-    fn reset_fine_rotation(&mut self) {
-        // Default: no-op
-    }
-
-    /// Set interpolation quality for transformations.
-    fn set_interpolation_quality(&mut self, _quality: InterpolationQuality) {
-        // Default: no-op
-    }
-}
-
-/// Trait for documents with multiple pages.
-pub trait MultiPage {
-    /// Get total number of pages.
-    fn page_count(&self) -> usize;
-
-    /// Get current page index (0-based).
-    fn current_page(&self) -> usize;
-
-    /// Navigate to a specific page.
-    fn go_to_page(&mut self, page: usize) -> DocResult<()>;
-}
-
-/// Trait for multi-page documents that support thumbnail generation.
-pub trait MultiPageThumbnails: MultiPage {
-    /// Get thumbnail for a specific page.
-    fn get_thumbnail(&mut self, page: usize) -> DocResult<Option<ImageHandle>>;
-
-    /// Check if thumbnails are ready to be generated.
-    fn thumbnails_ready(&self) -> bool;
-
-    /// Check if all thumbnails have been loaded.
-    fn thumbnails_loaded(&self) -> bool;
-
-    /// Generate thumbnail for a specific page.
-    fn generate_thumbnail_page(&mut self, page: usize) -> DocResult<()>;
-
-    /// Generate all thumbnails.
-    fn generate_all_thumbnails(&mut self) -> DocResult<()>;
-}
diff --git a/src/domain/document/core/metadata.rs b/src/domain/document/core/metadata.rs
deleted file mode 100644
index b62db25..0000000
--- a/src/domain/document/core/metadata.rs
+++ /dev/null
@@ -1,197 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/domain/document/core/metadata.rs
-//
-// Document metadata structures and EXIF parsing.
-
-use std::io::Cursor;
-
-/// Minutes per degree for GPS coordinate conversion (DMS to decimal degrees).
-const MINUTES_PER_DEGREE: f64 = 60.0;
-
-/// Seconds per degree for GPS coordinate conversion (DMS to decimal degrees).
-const SECONDS_PER_DEGREE: f64 = 3600.0;
-
-/// Basic document metadata (always available).
-#[derive(Debug, Clone)]
-pub struct BasicMeta {
-    /// File name (without path).
-    pub file_name: String,
-    /// Full file path.
-    pub file_path: String,
-    /// Image format as string (e.g., "PNG", "JPEG", "PDF").
-    pub format: String,
-    /// Width in pixels.
-    pub width: u32,
-    /// Height in pixels.
-    pub height: u32,
-    /// File size in bytes.
-    pub file_size: u64,
-    /// Color type description (e.g., "RGBA8", "RGB8", "Grayscale").
-    pub color_type: String,
-}
-
-impl BasicMeta {
-    /// Format file size as human-readable string.
-    pub fn file_size_display(&self) -> String {
-        const KB: u64 = 1024;
-        const MB: u64 = KB * 1024;
-        const GB: u64 = MB * 1024;
-
-        #[allow(clippy::cast_precision_loss)]
-        if self.file_size >= GB {
-            let size_gb = self.file_size as f64 / GB as f64;
-            format!("{size_gb:.2} GB")
-        } else if self.file_size >= MB {
-            let size_mb = self.file_size as f64 / MB as f64;
-            format!("{size_mb:.2} MB")
-        } else if self.file_size >= KB {
-            let size_kb = self.file_size as f64 / KB as f64;
-            format!("{size_kb:.1} KB")
-        } else {
-            let size = self.file_size;
-            format!("{size} B")
-        }
-    }
-
-    /// Format resolution as "W × H".
-    pub fn resolution_display(&self) -> String {
-        format!("{} × {}", self.width, self.height)
-    }
-}
-
-/// EXIF metadata (optional, mainly for JPEG/TIFF).
-#[derive(Debug, Clone, Default)]
-pub struct ExifMeta {
-    pub camera_make: Option<String>,
-    pub camera_model: Option<String>,
-    pub date_time: Option<String>,
-    pub exposure_time: Option<String>,
-    pub f_number: Option<String>,
-    pub iso: Option<u32>,
-    pub focal_length: Option<String>,
-    pub gps_latitude: Option<f64>,
-    pub gps_longitude: Option<f64>,
-}
-
-impl ExifMeta {
-    /// Parse EXIF data from raw image bytes.
-    ///
-    /// Extracts camera information, exposure settings, and GPS coordinates
-    /// from JPEG/TIFF EXIF metadata using the kamadak-exif crate.
-    pub fn from_bytes(bytes: &[u8]) -> Option<Self> {
-        use exif::{In, Reader, Tag};
-
-        let cursor = Cursor::new(bytes);
-        let exif_reader = Reader::new();
-        let exif = exif_reader.read_from_container(&mut cursor.clone()).ok()?;
-
-        let mut meta = Self::default();
-
-        // Camera make and model
-        if let Some(field) = exif.get_field(Tag::Make, In::PRIMARY) {
-            meta.camera_make = Some(field.display_value().to_string().trim().to_string());
-        }
-        if let Some(field) = exif.get_field(Tag::Model, In::PRIMARY) {
-            meta.camera_model = Some(field.display_value().to_string().trim().to_string());
-        }
-
-        // Date and time
-        if let Some(field) = exif.get_field(Tag::DateTime, In::PRIMARY) {
-            meta.date_time = Some(field.display_value().to_string());
-        }
-
-        // Exposure time
-        if let Some(field) = exif.get_field(Tag::ExposureTime, In::PRIMARY) {
-            meta.exposure_time = Some(field.display_value().to_string());
-        }
-
-        // F-number (aperture)
-        if let Some(field) = exif.get_field(Tag::FNumber, In::PRIMARY) {
-            meta.f_number = Some(field.display_value().to_string());
-        }
-
-        // ISO speed
-        if let Some(field) = exif.get_field(Tag::PhotographicSensitivity, In::PRIMARY) {
-            if let exif::Value::Short(ref vec) = field.value {
-                if let Some(&iso) = vec.first() {
-                    meta.iso = Some(u32::from(iso));
-                }
-            }
-        }
-
-        // Focal length
-        if let Some(field) = exif.get_field(Tag::FocalLength, In::PRIMARY) {
-            meta.focal_length = Some(field.display_value().to_string());
-        }
-
-        // GPS coordinates
-        meta.gps_latitude = Self::parse_gps_coord(&exif, Tag::GPSLatitude, Tag::GPSLatitudeRef);
-        meta.gps_longitude = Self::parse_gps_coord(&exif, Tag::GPSLongitude, Tag::GPSLongitudeRef);
-
-        Some(meta)
-    }
-
-    /// Parse GPS coordinate from EXIF data (converts DMS to decimal degrees).
-    fn parse_gps_coord(exif: &exif::Exif, coord_tag: exif::Tag, ref_tag: exif::Tag) -> Option<f64> {
-        use exif::{In, Value};
-
-        let coord_field = exif.get_field(coord_tag, In::PRIMARY)?;
-        let ref_field = exif.get_field(ref_tag, In::PRIMARY)?;
-
-        // Get reference (N/S for latitude, E/W for longitude)
-        let reference = ref_field.display_value().to_string();
-
-        // Parse DMS (Degrees, Minutes, Seconds) values
-        if let Value::Rational(ref rationals) = coord_field.value {
-            if rationals.len() >= 3 {
-                let degrees = rationals[0].to_f64();
-                let minutes = rationals[1].to_f64();
-                let seconds = rationals[2].to_f64();
-
-                // Convert to decimal degrees
-                let mut decimal =
-                    degrees + (minutes / MINUTES_PER_DEGREE) + (seconds / SECONDS_PER_DEGREE);
-
-                // Apply sign based on hemisphere
-                if reference == "S" || reference == "W" {
-                    decimal = -decimal;
-                }
-
-                return Some(decimal);
-            }
-        }
-
-        None
-    }
-
-    /// Combined camera make and model for display.
-    pub fn camera_display(&self) -> Option<String> {
-        match (&self.camera_make, &self.camera_model) {
-            (Some(make), Some(model)) => {
-                if model.starts_with(make) {
-                    Some(model.clone())
-                } else {
-                    Some(format!("{make} {model}"))
-                }
-            }
-            (Some(make), None) => Some(make.clone()),
-            (None, Some(model)) => Some(model.clone()),
-            (None, None) => None,
-        }
-    }
-
-    /// Format GPS coordinates for display.
-    pub fn gps_display(&self) -> Option<String> {
-        match (self.gps_latitude, self.gps_longitude) {
-            (Some(lat), Some(lon)) => Some(format!("{lat:.5}, {lon:.5}")),
-            _ => None,
-        }
-    }
-}
-
-/// Complete document metadata container.
-#[derive(Debug, Clone)]
-pub struct DocumentMeta {
-    pub basic: BasicMeta,
-    pub exif: Option<ExifMeta>,
-}
diff --git a/src/domain/document/core/mod.rs b/src/domain/document/core/mod.rs
deleted file mode 100644
index cb37441..0000000
--- a/src/domain/document/core/mod.rs
+++ /dev/null
@@ -1,13 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/domain/document/core/mod.rs
-//
-// Core document abstractions: traits, types, and metadata.
-
-pub mod content;
-pub mod document;
-pub mod metadata;
-pub mod page;
-
-// Re-export commonly used types
-pub use content::DocumentContent;
-pub use metadata::DocumentMeta;
diff --git a/src/domain/document/core/page.rs b/src/domain/document/core/page.rs
deleted file mode 100644
index 98929e6..0000000
--- a/src/domain/document/core/page.rs
+++ /dev/null
@@ -1,74 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/domain/document/core/page.rs
-//
-// Page abstraction for multi-page documents.
-
-use cosmic::widget::image::Handle as ImageHandle;
-
-/// Represents a single page in a multi-page document.
-#[derive(Debug, Clone)]
-#[allow(dead_code)]
-pub struct Page {
-    /// Page index (0-based).
-    pub index: usize,
-    /// Page width in pixels.
-    pub width: u32,
-    /// Page height in pixels.
-    pub height: u32,
-    /// Optional thumbnail handle.
-    pub thumbnail: Option<ImageHandle>,
-}
-
-impl Page {
-    /// Create a new page.
-    #[must_use]
-    pub fn new(index: usize, width: u32, height: u32) -> Self {
-        Self {
-            index,
-            width,
-            height,
-            thumbnail: None,
-        }
-    }
-
-    /// Create a page with a thumbnail.
-    #[must_use]
-    pub fn with_thumbnail(index: usize, width: u32, height: u32, thumbnail: ImageHandle) -> Self {
-        Self {
-            index,
-            width,
-            height,
-            thumbnail: Some(thumbnail),
-        }
-    }
-
-    /// Set the thumbnail for this page.
-    pub fn set_thumbnail(&mut self, thumbnail: ImageHandle) {
-        self.thumbnail = Some(thumbnail);
-    }
-
-    /// Check if this page has a thumbnail.
-    #[must_use]
-    pub fn has_thumbnail(&self) -> bool {
-        self.thumbnail.is_some()
-    }
-
-    /// Get the aspect ratio of the page.
-    #[must_use]
-    pub fn aspect_ratio(&self) -> f32 {
-        if self.height == 0 {
-            1.0
-        } else {
-            #[allow(clippy::cast_precision_loss)]
-            {
-                self.width as f32 / self.height as f32
-            }
-        }
-    }
-
-    /// Get page dimensions as a tuple.
-    #[must_use]
-    pub fn dimensions(&self) -> (u32, u32) {
-        (self.width, self.height)
-    }
-}
diff --git a/src/domain/document/mod.rs b/src/domain/document/mod.rs
deleted file mode 100644
index d4211e9..0000000
--- a/src/domain/document/mod.rs
+++ /dev/null
@@ -1,17 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/domain/document/mod.rs
-//
-// Document domain: core abstractions, types, and operations.
-
-pub mod collection;
-pub mod core;
-pub mod operations;
-pub mod types;
-
-// Re-export core abstractions (only used ones)
-#[allow(unused_imports)]
-pub use core::{DocumentContent, DocumentMeta};
-
-// Note: Low-level pixel operations (apply_rotation, apply_flip, crop_image)
-// are internal helpers used only by document type implementations.
-// Use high-level operations above for all application and UI code.
diff --git a/src/domain/document/operations/README.md b/src/domain/document/operations/README.md
deleted file mode 100644
index 2dfb964..0000000
--- a/src/domain/document/operations/README.md
+++ /dev/null
@@ -1,281 +0,0 @@
-# Document Operations
-
-This module provides transformation, rendering, and export operations for documents.
-
-## Architecture: Two-Level Operations
-
-The operations module is designed with **two distinct levels** of abstraction:
-
-### 1. Low-Level Operations (Internal/Private)
-
-**Purpose:** Direct manipulation of pixel data for raster images.
-
-**Visibility:** `pub(crate)` - Internal to the crate only.
-
-**Location:** `transform.rs` (internal helpers)
-
-**Functions:**
-- `apply_rotation(img, rotation)` - Rotate raster pixels
-- `apply_flip(img, direction)` - Flip raster pixels
-- `crop_to_image(img, x, y, w, h)` - Crop raster to image
-
-**When to use:**
-- ONLY in document type implementations (RasterDocument, VectorDocument, PortableDocument)
-- NOT accessible outside the crate
-- NOT for application or UI code
-
-**Example:**
-```rust
-// INTERNAL USE ONLY - in document type implementations
-impl Transformable for RasterDocument {
-    fn rotate(&mut self, rotation: Rotation) {
-        // Low-level operation used internally
-        self.image = apply_rotation(self.image, rotation);
-    }
-}
-```
-
-### 2. High-Level Operations (Type-Agnostic)
-
-**Purpose:** Document transformations that work across **all** document types (Raster, Vector, Portable).
-
-**Location:** `transform.rs` (high-level section)
-
-**Functions:**
-- `rotate_document_cw(document)` - Rotate any document 90° CW
-- `rotate_document_ccw(document)` - Rotate any document 90° CCW
-- `flip_document_horizontal(document)` - Flip any document horizontally
-- `flip_document_vertical(document)` - Flip any document vertically
-- `rotate_document_to(document, rotation)` - Rotate to specific angle
-- `reset_document_transforms(document)` - Reset all transformations
-
-**When to use:**
-- In application commands (`TransformDocumentCommand`)
-- In UI message handlers
-- Anywhere you work with `DocumentContent` (type-erased document)
-
-**Example:**
-```rust
-use crate::domain::document::operations::transform;
-
-// RECOMMENDED: Use high-level operations
-let mut document = DocumentContent::Raster(raster_doc);
-transform::rotate_document_cw(&mut document)?;
-transform::flip_document_horizontal(&mut document)?;
-
-// Works with Vector and Portable too!
-let mut svg = DocumentContent::Vector(vector_doc);
-transform::rotate_document_cw(&mut svg)?; // Lossless viewport transform
-
-// Works with PDF!
-let mut pdf = DocumentContent::Portable(portable_doc);
-transform::rotate_document_cw(&mut pdf)?; // Backend handles rendering
-```
-
-## Why This Separation?
-
-### Why Low-Level Operations Are Internal
-
-**Problem:** Exposing low-level operations creates confusion:
-- Developers don't know whether to use `apply_rotation()` or `rotate_document_cw()`
-- Low-level operations only work on `DynamicImage`, not `DocumentContent`
-- Creates two ways to do the same thing (violates DRY)
-
-**Solution:** Make them `pub(crate)`:
-```rust
-// NOT POSSIBLE - apply_rotation is internal
-transform::apply_rotation(img, Rotation::Cw90);  // Compile error!
-
-// USE THIS - high-level operation
-transform::rotate_document_cw(&mut document)?;  // Works!
-```
-
-### Why High-Level Operations Exist
-
-**Problem without them:**
-```rust
-// Coupled to implementation details
-match document {
-    DocumentContent::Raster(ref mut doc) => doc.rotate(Rotation::Cw90),
-    DocumentContent::Vector(ref mut doc) => doc.rotate(Rotation::Cw90),
-    DocumentContent::Portable(ref mut doc) => doc.rotate(Rotation::Cw90),
-}
-```
-
-**Solution:**
-```rust
-// Single API for all types
-transform::rotate_document_cw(&mut document)?;
-```
-
-### Benefits
-
-1. **Single Source of Truth**
-   - Rotation logic (handling RotationMode::Fine, etc.) is in ONE place
-   - No duplication across UI handlers, commands, and tests
-
-2. **Type Safety**
-   - Works through `DocumentContent` abstraction
-   - Compiler ensures all document types implement required traits
-
-3. **Future-Proof**
-   - Adding new document types (DJVU, EPUB) doesn't require updating call sites
-   - Operations automatically work with new types
-
-4. **Testable**
-   - High-level operations can be tested independently
-   - No UI dependencies
-
-## Implementation Details
-
-### How It Works
-
-High-level operations use the `Transformable` trait:
-
-```rust
-pub fn rotate_document_cw(document: &mut DocumentContent) -> DocResult<()> {
-    let new_rotation_mode = document.transform_state().rotation.rotate_cw();
-    
-    match new_rotation_mode {
-        RotationMode::Standard(rot) => document.rotate(rot),
-        RotationMode::Fine(deg) => {
-            // Convert fine rotation to nearest 90° standard rotation
-            // ...
-        }
-    }
-    
-    Ok(())
-}
-```
-
-This delegates to the document type's implementation:
-
-- **Raster:** Actual pixel rotation via `imageops::rotate90()`
-- **Vector:** Viewport matrix transformation (lossless!)
-- **Portable:** View rotation, rendered by backend (Poppler)
-
-### Each Type Transforms Differently
-
-```rust
-// Raster: Pixel manipulation (lossy for fine rotations)
-impl Transformable for RasterDocument {
-    fn rotate(&mut self, rotation: Rotation) {
-        self.image = apply_rotation(self.image, rotation);
-    }
-}
-
-// Vector: Viewport transform (always lossless!)
-impl Transformable for VectorDocument {
-    fn rotate(&mut self, rotation: Rotation) {
-        self.transform_matrix = self.transform_matrix.rotate(rotation.to_degrees());
-        // No rasterization needed
-    }
-}
-
-// Portable: View rotation (backend handles rendering)
-impl Transformable for PortableDocument {
-    fn rotate(&mut self, rotation: Rotation) {
-        self.view_rotation = (self.view_rotation + rotation.to_degrees()) % 360;
-    }
-}
-```
-
-## Usage Guidelines
-
-### Prefer High-Level Operations
-
-```rust
-// In application commands
-pub fn execute(&self, manager: &mut DocumentManager) -> DocResult<()> {
-    let document = manager.current_document_mut()?;
-    transform::rotate_document_cw(document)?;
-    Ok(())
-}
-
-// In UI message handlers
-AppMessage::RotateCW => {
-    if let Some(doc) = &mut self.model.document {
-        transform::rotate_document_cw(doc)?;
-    }
-}
-```
-
-### Don't Use Low-Level Operations in Application/UI Code
-
-```rust
-// COMPILE ERROR - Low-level operations are pub(crate)
-let pixels = transform::apply_rotation(img, Rotation::Cw90);  // Won't compile!
-
-// CORRECT - Use high-level operations
-transform::rotate_document_cw(&mut document)?;
-```
-
-### ℹ️ Low-Level Operations in Document Implementations
-
-Low-level operations are only accessible within document type implementations:
-
-```rust
-// INTERNAL ONLY - in domain/document/types/raster.rs
-impl Transformable for RasterDocument {
-    fn rotate(&mut self, rotation: Rotation) {
-        // This works because we're inside the crate
-        self.image = apply_rotation(self.image, rotation);
-    }
-}
-```
-
-## Module Structure
-
-```
-operations/
-├── mod.rs              # Public API exports
-├── transform.rs        # Low-level + High-level transforms
-├── render.rs           # Rendering utilities (scale, fit, etc.)
-├── export.rs           # Export to various formats
-└── README.md           # This file
-```
-
-## Adding New Operations
-
-When adding a new operation:
-
-1. **Add low-level function** (if pixel manipulation is needed) - mark as `pub(crate)`
-2. **Add high-level function** that works on `DocumentContent` - mark as `pub`
-3. **Export high-level function only** from `mod.rs`
-4. **Update domain exports** in `domain/document/mod.rs`
-5. **Create command** in `application/commands/`
-
-Example:
-
-```rust
-// 1. Low-level (internal only) - in transform.rs
-pub(crate) fn apply_grayscale(img: DynamicImage) -> DynamicImage { ... }
-
-// 2. High-level (public API) - in transform.rs
-pub fn grayscale_document(document: &mut DocumentContent) -> DocResult<()> {
-    // Delegates to Transformable trait or uses low-level helper
-    ...
-}
-
-// 3. Export high-level only - in operations/mod.rs
-pub use transform::{grayscale_document};  // NOT apply_grayscale!
-
-// 4. Export from domain - in document/mod.rs
-pub use operations::{grayscale_document};
-
-// 5. Command - in application/commands/
-pub struct GrayscaleCommand;
-impl GrayscaleCommand {
-    pub fn execute(&self, manager: &mut DocumentManager) -> DocResult<()> {
-        let doc = manager.current_document_mut()?;
-        transform::grayscale_document(doc)  // High-level operation
-    }
-}
-```
-
-## Related Concepts
-
-- **Traits:** `Renderable`, `Transformable`, `MultiPage` (in `domain/document/core/document.rs`)
-- **Type Erasure:** `DocumentContent` enum (in `domain/document/core/content.rs`)
-- **Commands:** Application layer operations (in `application/commands/`)
-- **Domain Layer:** Pure business logic, no UI dependencies
diff --git a/src/domain/document/operations/crop.rs b/src/domain/document/operations/crop.rs
deleted file mode 100644
index 8bc0035..0000000
--- a/src/domain/document/operations/crop.rs
+++ /dev/null
@@ -1,31 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/domain/document/operations/crop.rs
-//
-// Crop operation domain model.
-
-/// Crop region in pixel coordinates.
-/// 
-/// Pure domain model - represents a rectangular region to crop.
-/// No UI concerns, just data.
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub struct CropRegion {
-    pub x: u32,
-    pub y: u32,
-    pub width: u32,
-    pub height: u32,
-}
-
-impl CropRegion {
-    pub fn new(x: u32, y: u32, width: u32, height: u32) -> Self {
-        Self { x, y, width, height }
-    }
-
-    pub fn as_tuple(&self) -> (u32, u32, u32, u32) {
-        (self.x, self.y, self.width, self.height)
-    }
-
-    /// Check if region has valid dimensions.
-    pub fn is_valid(&self) -> bool {
-        self.width > 0 && self.height > 0
-    }
-}
diff --git a/src/domain/document/operations/export.rs b/src/domain/document/operations/export.rs
deleted file mode 100644
index aa78ffa..0000000
--- a/src/domain/document/operations/export.rs
+++ /dev/null
@@ -1,161 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/domain/document/operations/export.rs
-//
-// Document export operations to various formats.
-
-use std::path::Path;
-
-use image::DynamicImage;
-
-use crate::domain::document::core::document::DocResult;
-
-/// Supported export formats.
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub enum ExportFormat {
-    /// PNG format (lossless).
-    Png,
-    /// JPEG format (lossy).
-    Jpeg,
-    /// WebP format.
-    WebP,
-    /// PDF format.
-    Pdf,
-    /// SVG format (for vector documents).
-    Svg,
-}
-
-impl ExportFormat {
-    /// Get file extension for this format.
-    #[must_use]
-    pub fn extension(&self) -> &str {
-        match self {
-            Self::Png => "png",
-            Self::Jpeg => "jpg",
-            Self::WebP => "webp",
-            Self::Pdf => "pdf",
-            Self::Svg => "svg",
-        }
-    }
-
-    /// Get MIME type for this format.
-    #[must_use]
-    pub fn mime_type(&self) -> &str {
-        match self {
-            Self::Png => "image/png",
-            Self::Jpeg => "image/jpeg",
-            Self::WebP => "image/webp",
-            Self::Pdf => "application/pdf",
-            Self::Svg => "image/svg+xml",
-        }
-    }
-
-    /// Detect format from file extension.
-    #[must_use]
-    pub fn from_path(path: &Path) -> Option<Self> {
-        let ext = path.extension()?.to_str()?.to_lowercase();
-        match ext.as_str() {
-            "png" => Some(Self::Png),
-            "jpg" | "jpeg" => Some(Self::Jpeg),
-            "webp" => Some(Self::WebP),
-            "pdf" => Some(Self::Pdf),
-            "svg" => Some(Self::Svg),
-            _ => None,
-        }
-    }
-}
-
-/// Export options for image formats.
-#[derive(Debug, Clone)]
-#[allow(dead_code)]
-pub struct ImageExportOptions {
-    /// Quality setting (0-100) for lossy formats.
-    pub quality: u8,
-    /// Whether to preserve metadata (EXIF, etc.).
-    pub preserve_metadata: bool,
-}
-
-impl Default for ImageExportOptions {
-    fn default() -> Self {
-        Self {
-            quality: 90,
-            preserve_metadata: true,
-        }
-    }
-}
-
-/// Export a raster image to a file.
-///
-/// This function handles format-specific encoding and options.
-pub fn export_image(
-    img: &DynamicImage,
-    path: &Path,
-    format: ExportFormat,
-    _options: &ImageExportOptions,
-) -> DocResult<()> {
-    match format {
-        ExportFormat::Png => {
-            img.save_with_format(path, image::ImageFormat::Png)?;
-        }
-        ExportFormat::Jpeg => {
-            // TODO: Apply quality settings
-            img.save_with_format(path, image::ImageFormat::Jpeg)?;
-        }
-        ExportFormat::WebP => {
-            img.save_with_format(path, image::ImageFormat::WebP)?;
-        }
-        ExportFormat::Pdf | ExportFormat::Svg => {
-            return Err(anyhow::anyhow!(
-                "Export to {} not yet implemented",
-                format.extension()
-            ));
-        }
-    }
-
-    Ok(())
-}
-
-/// Export a document to a standard paper format (A4, Letter, etc.).
-///
-/// This function resizes the document to fit the target format while maintaining
-/// aspect ratio, then exports it.
-pub fn export_to_paper_format(
-    img: &DynamicImage,
-    path: &Path,
-    target_width: u32,
-    target_height: u32,
-    format: ExportFormat,
-) -> DocResult<()> {
-    use image::imageops::FilterType;
-
-    // Resize to fit target dimensions
-    let resized = img.resize(target_width, target_height, FilterType::Lanczos3);
-
-    // Export with default options
-    let options = ImageExportOptions::default();
-    export_image(&resized, path, format, &options)
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_format_extension() {
-        assert_eq!(ExportFormat::Png.extension(), "png");
-        assert_eq!(ExportFormat::Jpeg.extension(), "jpg");
-        assert_eq!(ExportFormat::Pdf.extension(), "pdf");
-    }
-
-    #[test]
-    fn test_format_from_path() {
-        assert_eq!(
-            ExportFormat::from_path(Path::new("test.png")),
-            Some(ExportFormat::Png)
-        );
-        assert_eq!(
-            ExportFormat::from_path(Path::new("test.JPG")),
-            Some(ExportFormat::Jpeg)
-        );
-        assert_eq!(ExportFormat::from_path(Path::new("test.txt")), None);
-    }
-}
diff --git a/src/domain/document/operations/mod.rs b/src/domain/document/operations/mod.rs
deleted file mode 100644
index 72f7c23..0000000
--- a/src/domain/document/operations/mod.rs
+++ /dev/null
@@ -1,16 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/domain/document/operations/mod.rs
-//
-// Document operations: transformations, rendering, and export.
-
-pub mod crop;
-pub mod export;
-pub mod render;
-pub mod transform;
-
-// Re-export CropRegion for convenience
-pub use crop::CropRegion;
-
-// Note: Low-level pixel operations (apply_rotation, apply_flip, crop_image)
-// are internal helpers (pub(crate)) used only by document type implementations.
-// Use high-level operations above for application and UI code.
diff --git a/src/domain/document/operations/render.rs b/src/domain/document/operations/render.rs
deleted file mode 100644
index ce7c0ac..0000000
--- a/src/domain/document/operations/render.rs
+++ /dev/null
@@ -1,108 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/domain/document/operations/render.rs
-//
-// Rendering operations for documents.
-
-use cosmic::widget::image::Handle as ImageHandle;
-use image::{DynamicImage, GenericImageView};
-
-/// Create an image handle from RGBA pixel data.
-///
-/// This is the primary way to create image handles for display in the UI.
-#[must_use]
-pub fn create_image_handle(pixels: Vec<u8>, width: u32, height: u32) -> ImageHandle {
-    ImageHandle::from_rgba(width, height, pixels)
-}
-
-/// Create an image handle from a `DynamicImage`.
-///
-/// Converts the image to RGBA8 format and creates a handle.
-#[must_use]
-pub fn create_image_handle_from_image(img: &DynamicImage) -> ImageHandle {
-    let (width, height) = img.dimensions();
-    let pixels = img.to_rgba8().into_raw();
-    create_image_handle(pixels, width, height)
-}
-
-/// Refresh image handle from a `DynamicImage`.
-///
-/// Alias for `create_image_handle_from_image` for compatibility.
-#[must_use]
-pub fn refresh_handle_from_image(img: &DynamicImage) -> ImageHandle {
-    create_image_handle_from_image(img)
-}
-
-/// Calculate scaled dimensions maintaining aspect ratio.
-///
-/// Returns (width, height) scaled by the given factor.
-#[must_use]
-pub fn scale_dimensions(width: u32, height: u32, scale: f64) -> (u32, u32) {
-    #[allow(clippy::cast_possible_truncation, clippy::cast_sign_loss)]
-    let scaled_width = (f64::from(width) * scale).round() as u32;
-    #[allow(clippy::cast_possible_truncation, clippy::cast_sign_loss)]
-    let scaled_height = (f64::from(height) * scale).round() as u32;
-
-    (scaled_width.max(1), scaled_height.max(1))
-}
-
-/// Calculate scale factor to fit dimensions into a target size.
-///
-/// Returns a scale factor that will make the image fit within the target
-/// dimensions while maintaining aspect ratio.
-#[must_use]
-pub fn calculate_fit_scale(width: u32, height: u32, target_width: u32, target_height: u32) -> f64 {
-    if width == 0 || height == 0 {
-        return 1.0;
-    }
-
-    let width_scale = f64::from(target_width) / f64::from(width);
-    let height_scale = f64::from(target_height) / f64::from(height);
-
-    width_scale.min(height_scale)
-}
-
-/// Calculate scale factor to fill dimensions.
-///
-/// Returns a scale factor that will make the image fill the target dimensions
-/// while maintaining aspect ratio (may crop).
-#[must_use]
-pub fn calculate_fill_scale(width: u32, height: u32, target_width: u32, target_height: u32) -> f64 {
-    if width == 0 || height == 0 {
-        return 1.0;
-    }
-
-    let width_scale = f64::from(target_width) / f64::from(width);
-    let height_scale = f64::from(target_height) / f64::from(height);
-
-    width_scale.max(height_scale)
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_scale_dimensions() {
-        assert_eq!(scale_dimensions(100, 200, 2.0), (200, 400));
-        assert_eq!(scale_dimensions(100, 200, 0.5), (50, 100));
-        assert_eq!(scale_dimensions(100, 200, 0.0), (1, 1)); // Minimum 1x1
-    }
-
-    #[test]
-    fn test_calculate_fit_scale() {
-        // Landscape image fitting into square
-        assert_eq!(calculate_fit_scale(200, 100, 100, 100), 0.5);
-        // Portrait image fitting into square
-        assert_eq!(calculate_fit_scale(100, 200, 100, 100), 0.5);
-        // Square into square
-        assert_eq!(calculate_fit_scale(100, 100, 100, 100), 1.0);
-    }
-
-    #[test]
-    fn test_calculate_fill_scale() {
-        // Landscape image filling square
-        assert_eq!(calculate_fill_scale(200, 100, 100, 100), 1.0);
-        // Portrait image filling square
-        assert_eq!(calculate_fill_scale(100, 200, 100, 100), 1.0);
-    }
-}
diff --git a/src/domain/document/operations/transform.rs b/src/domain/document/operations/transform.rs
deleted file mode 100644
index 86a0e0c..0000000
--- a/src/domain/document/operations/transform.rs
+++ /dev/null
@@ -1,323 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/domain/document/operations/transform.rs
-//
-// Document transformation operations.
-//
-// This module provides two levels of transformation operations:
-//
-// 1. **Low-level operations** (internal) for direct pixel manipulation on raster images:
-//    - `apply_rotation()` - Rotate pixels by 90°, 180°, or 270° [pub(crate)]
-//    - `apply_flip()` - Flip pixels horizontally or vertically [pub(crate)]
-//    - `crop_image()` - Crop to a specific region [pub(crate)]
-//    These are used internally by document type implementations only.
-//
-// 2. **High-level operations** that work on any document type (raster, vector, PDF):
-//    - `rotate_document_cw()` - Rotate any document 90° clockwise
-//    - `rotate_document_ccw()` - Rotate any document 90° counter-clockwise
-//    - `flip_document_horizontal()` - Flip any document horizontally
-//    - `flip_document_vertical()` - Flip any document vertically
-//    - `rotate_document_to()` - Rotate to a specific angle
-//    - `reset_document_transforms()` - Reset all transformations
-//
-// ## Usage Example
-//
-// ```rust
-// use crate::domain::document::operations::transform;
-//
-// // High-level: Works with any DocumentContent (RECOMMENDED)
-// let mut document = DocumentContent::Raster(raster_doc);
-// transform::rotate_document_cw(&mut document)?;
-// transform::flip_document_horizontal(&mut document)?;
-// ```
-//
-// Note: Low-level operations (apply_rotation, apply_flip, crop_image) are
-// internal helpers used by document type implementations and are not part
-// of the public API.
-//
-// The high-level operations use the `Transformable` trait and work across all
-// document types (Raster, Vector, Portable), while low-level operations work
-// directly on pixel data.
-
-use image::{DynamicImage, GenericImageView};
-
-use crate::domain::document::core::content::DocumentContent;
-use crate::domain::document::core::document::{
-    DocResult, FlipDirection, Rotation, RotationMode, Transformable,
-};
-
-/// Apply a 90-degree rotation to a raster image.
-///
-/// This function performs the actual pixel manipulation for standard rotations.
-/// Used internally by `RasterDocument` implementation.
-#[must_use]
-pub(crate) fn apply_rotation(img: DynamicImage, rotation: Rotation) -> DynamicImage {
-    use image::imageops::{rotate180, rotate270, rotate90};
-
-    match rotation {
-        Rotation::None => img,
-        Rotation::Cw90 => DynamicImage::ImageRgba8(rotate90(&img.to_rgba8())),
-        Rotation::Cw180 => DynamicImage::ImageRgba8(rotate180(&img.to_rgba8())),
-        Rotation::Cw270 => DynamicImage::ImageRgba8(rotate270(&img.to_rgba8())),
-    }
-}
-
-/// Apply a flip transformation to a raster image.
-///
-/// This function performs the actual pixel manipulation for flip operations.
-/// Used internally by `RasterDocument` and `PortableDocument` implementations.
-#[must_use]
-pub(crate) fn apply_flip(img: DynamicImage, direction: FlipDirection) -> DynamicImage {
-    use image::imageops::{flip_horizontal, flip_vertical};
-
-    match direction {
-        FlipDirection::Horizontal => DynamicImage::ImageRgba8(flip_horizontal(&img.to_rgba8())),
-        FlipDirection::Vertical => DynamicImage::ImageRgba8(flip_vertical(&img.to_rgba8())),
-    }
-}
-
-/// Crop a raster image to the specified region.
-///
-/// Coordinates are in pixels relative to the top-left corner.
-/// Returns None if the crop region is invalid.
-/// Used internally for crop operations.
-#[must_use]
-pub(crate) fn crop_image(
-    img: &DynamicImage,
-    x: u32,
-    y: u32,
-    width: u32,
-    height: u32,
-) -> Option<DynamicImage> {
-    let (img_width, img_height) = img.dimensions();
-
-    // Validate crop region
-    if x >= img_width || y >= img_height {
-        return None;
-    }
-
-    // Clamp dimensions to image bounds
-    let crop_width = width.min(img_width - x);
-    let crop_height = height.min(img_height - y);
-
-    if crop_width == 0 || crop_height == 0 {
-        return None;
-    }
-
-    Some(img.crop_imm(x, y, crop_width, crop_height))
-}
-
-/// Calculate dimensions after rotation.
-///
-/// For 90° and 270° rotations, width and height are swapped.
-#[must_use]
-pub fn dimensions_after_rotation(width: u32, height: u32, rotation: Rotation) -> (u32, u32) {
-    match rotation {
-        Rotation::None | Rotation::Cw180 => (width, height),
-        Rotation::Cw90 | Rotation::Cw270 => (height, width),
-    }
-}
-
-// ============================================================================
-// High-Level Document Operations (Type-agnostic)
-// ============================================================================
-//
-// These operations work on ANY document type (Raster, Vector, Portable) through
-// the DocumentContent abstraction. They should be preferred over direct trait
-// calls when implementing UI commands or application logic.
-//
-// Benefits:
-// - Single API for all document types
-// - Handles rotation mode conversions (Standard ↔ Fine)
-// - Returns Result for error handling
-// - Future-proof for new document types
-
-/// Rotate a document 90 degrees clockwise.
-///
-/// This operation works on any document type (Raster, Vector, Portable) by
-/// delegating to the underlying document's `Transformable` implementation.
-///
-/// # Examples
-///
-/// ```no_run
-/// use crate::domain::document::operations::transform::rotate_document_cw;
-///
-/// // Works with any document type
-/// rotate_document_cw(&mut document)?;
-/// ```
-///
-/// # Implementation Details
-///
-/// - Raster: Actual pixel rotation via image operations
-/// - Vector: Viewport matrix transformation (lossless)
-/// - Portable: View rotation, rendered by backend
-pub fn rotate_document_cw(document: &mut DocumentContent) -> DocResult<()> {
-    let new_rotation_mode = document.transform_state().rotation.rotate_cw();
-
-    match new_rotation_mode {
-        RotationMode::Standard(rot) => {
-            document.rotate(rot);
-        }
-        RotationMode::Fine(deg) => {
-            // Convert to nearest 90° rotation
-            let normalized = ((deg / 90.0).round() as i16 * 90) % 360;
-            let rot = match normalized {
-                0 => Rotation::None,
-                90 => Rotation::Cw90,
-                180 => Rotation::Cw180,
-                270 => Rotation::Cw270,
-                _ => Rotation::None,
-            };
-            document.rotate(rot);
-        }
-    }
-
-    Ok(())
-}
-
-/// Rotate a document 90 degrees counter-clockwise.
-///
-/// This operation works on any document type (Raster, Vector, Portable) by
-/// delegating to the underlying document's `Transformable` implementation.
-///
-/// # Examples
-///
-/// ```no_run
-/// use crate::domain::document::operations::transform::rotate_document_ccw;
-///
-/// rotate_document_ccw(&mut document)?;
-/// ```
-pub fn rotate_document_ccw(document: &mut DocumentContent) -> DocResult<()> {
-    let new_rotation_mode = document.transform_state().rotation.rotate_ccw();
-
-    match new_rotation_mode {
-        RotationMode::Standard(rot) => {
-            document.rotate(rot);
-        }
-        RotationMode::Fine(deg) => {
-            // Convert to nearest 90° rotation
-            let normalized = ((deg / 90.0).round() as i16 * 90 + 360) % 360;
-            let rot = match normalized {
-                0 => Rotation::None,
-                90 => Rotation::Cw90,
-                180 => Rotation::Cw180,
-                270 => Rotation::Cw270,
-                _ => Rotation::None,
-            };
-            document.rotate(rot);
-        }
-    }
-
-    Ok(())
-}
-
-/// Flip a document horizontally (mirror left-right).
-///
-/// This operation works on any document type by delegating to the underlying
-/// document's `Transformable` implementation.
-///
-/// # Examples
-///
-/// ```no_run
-/// use crate::domain::document::operations::transform::flip_document_horizontal;
-///
-/// flip_document_horizontal(&mut document)?;
-/// ```
-pub fn flip_document_horizontal(document: &mut DocumentContent) -> DocResult<()> {
-    document.flip(FlipDirection::Horizontal);
-    Ok(())
-}
-
-/// Flip a document vertically (mirror top-bottom).
-///
-/// This operation works on any document type by delegating to the underlying
-/// document's `Transformable` implementation.
-///
-/// # Examples
-///
-/// ```no_run
-/// use crate::domain::document::operations::transform::flip_document_vertical;
-///
-/// flip_document_vertical(&mut document)?;
-/// ```
-pub fn flip_document_vertical(document: &mut DocumentContent) -> DocResult<()> {
-    document.flip(FlipDirection::Vertical);
-    Ok(())
-}
-
-/// Rotate a document to a specific angle (0°, 90°, 180°, or 270°).
-///
-/// This operation works on any document type by delegating to the underlying
-/// document's `Transformable` implementation.
-///
-/// # Arguments
-///
-/// * `document` - The document to rotate
-/// * `rotation` - Target rotation angle
-///
-/// # Examples
-///
-/// ```no_run
-/// use crate::domain::document::core::document::Rotation;
-/// use crate::domain::document::operations::transform::rotate_document_to;
-///
-/// // Rotate to 180 degrees
-/// rotate_document_to(&mut document, Rotation::Cw180)?;
-/// ```
-pub fn rotate_document_to(document: &mut DocumentContent, rotation: Rotation) -> DocResult<()> {
-    document.rotate(rotation);
-    Ok(())
-}
-
-/// Reset all transformations on a document.
-///
-/// This resets the document to its original state (no rotation, no flips).
-/// Useful for implementing "Reset View" functionality.
-///
-/// # Examples
-///
-/// ```no_run
-/// use crate::domain::document::operations::transform::reset_document_transforms;
-///
-/// // Undo all rotations and flips
-/// reset_document_transforms(&mut document)?;
-/// ```
-pub fn reset_document_transforms(document: &mut DocumentContent) -> DocResult<()> {
-    // Reset to no rotation
-    document.rotate(Rotation::None);
-
-    // Reset flips by checking current state and flipping back if needed
-    let state = document.transform_state();
-    if state.flip_h {
-        document.flip(FlipDirection::Horizontal);
-    }
-    if state.flip_v {
-        document.flip(FlipDirection::Vertical);
-    }
-
-    Ok(())
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_dimensions_after_rotation() {
-        assert_eq!(
-            dimensions_after_rotation(100, 200, Rotation::None),
-            (100, 200)
-        );
-        assert_eq!(
-            dimensions_after_rotation(100, 200, Rotation::Cw90),
-            (200, 100)
-        );
-        assert_eq!(
-            dimensions_after_rotation(100, 200, Rotation::Cw180),
-            (100, 200)
-        );
-        assert_eq!(
-            dimensions_after_rotation(100, 200, Rotation::Cw270),
-            (200, 100)
-        );
-    }
-}
diff --git a/src/domain/document/types/mod.rs b/src/domain/document/types/mod.rs
deleted file mode 100644
index 07e5470..0000000
--- a/src/domain/document/types/mod.rs
+++ /dev/null
@@ -1,10 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/domain/document/types/mod.rs
-//
-// Concrete document type implementations.
-
-pub mod raster;
-#[cfg(feature = "vector")]
-pub mod vector;
-#[cfg(feature = "portable")]
-pub mod portable;
diff --git a/src/domain/document/types/portable.rs b/src/domain/document/types/portable.rs
deleted file mode 100644
index 4d41b5b..0000000
--- a/src/domain/document/types/portable.rs
+++ /dev/null
@@ -1,473 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/domain/document/types/portable.rs
-//
-// Portable documents (PDF) with poppler backend.
-
-use std::path::{Path, PathBuf};
-
-/// PDF page render quality multiplier (2.0 = double resolution for sharp display).
-const PDF_RENDER_QUALITY: f64 = 3.0;
-
-/// PDF thumbnail size multiplier (0.25 = 25% for fast preview generation).
-const PDF_THUMBNAIL_SIZE: f64 = 0.25;
-
-use cairo::{Context, Format, ImageSurface};
-use image::{DynamicImage, GenericImageView};
-use poppler::PopplerDocument;
-
-use cosmic::widget::image::Handle as ImageHandle;
-
-use crate::domain::document::core::document::{
-    DocResult, DocumentInfo, FlipDirection, MultiPage, MultiPageThumbnails, Renderable,
-    RenderOutput, Rotation, RotationMode, TransformState, Transformable,
-};
-
-/// Represents a portable document (PDF).
-pub struct PortableDocument {
-    /// The parsed PDF document.
-    document: PopplerDocument,
-    /// Path to the source file (for caching).
-    source_path: PathBuf,
-    /// Total number of pages.
-    num_pages: usize,
-    /// Current page index (0-based).
-    page_index: usize,
-    /// Current transformation state.
-    transform: TransformState,
-    /// Current rendered page as image.
-    pub rendered: DynamicImage,
-    /// Image handle for display.
-    pub handle: ImageHandle,
-    /// Cached thumbnail handles for each page (None = not yet generated).
-    thumbnail_cache: Option<Vec<ImageHandle>>,
-}
-
-impl PortableDocument {
-    /// Open a PDF document and render the first page.
-    pub fn open(path: &Path) -> anyhow::Result<Self> {
-        let document = PopplerDocument::new_from_file(path, None)
-            .map_err(|e| anyhow::anyhow!("Failed to parse PDF: {e}"))?;
-
-        let num_pages = document.get_n_pages();
-        if num_pages == 0 {
-            return Err(anyhow::anyhow!("PDF has no pages"));
-        }
-
-        let rendered = Self::render_page(&document, 0, RotationMode::Standard(Rotation::None))?;
-        let handle = Self::create_image_handle_from_image(&rendered);
-
-        Ok(Self {
-            document,
-            source_path: path.to_path_buf(),
-            num_pages,
-            page_index: 0,
-            transform: TransformState::default(),
-            rendered,
-            handle,
-            thumbnail_cache: None,
-        })
-    }
-
-    /// Returns the current pixel dimensions (width, height).
-    #[must_use]
-    pub fn dimensions(&self) -> (u32, u32) {
-        self.rendered.dimensions()
-    }
-
-    /// Get the current image handle.
-    #[must_use]
-    pub fn handle(&self) -> ImageHandle {
-        self.handle.clone()
-    }
-
-    /// Get native dimensions of current page.
-    #[must_use]
-    pub fn native_dimensions(&self) -> (u32, u32) {
-        self.rendered.dimensions()
-    }
-
-    /// Get the number of thumbnails currently loaded.
-    pub fn thumbnails_loaded(&self) -> usize {
-        self.thumbnail_cache.as_ref().map_or(0, Vec::len)
-    }
-
-    /// Get thumbnail handle for a specific page (read-only access).
-    /// Returns None if the thumbnail hasn't been generated yet.
-    #[must_use]
-    pub fn get_thumbnail_handle(&self, page: usize) -> Option<ImageHandle> {
-        self.thumbnail_cache
-            .as_ref()
-            .and_then(|cache| cache.get(page).cloned())
-    }
-
-    // Helper functions
-
-    /// Extract metadata for this portable document.
-    pub fn extract_meta(&self, path: &Path) -> crate::domain::document::core::metadata::DocumentMeta {
-        use crate::domain::document::core::metadata::{BasicMeta, DocumentMeta};
-
-        let file_name = path
-            .file_name()
-            .and_then(|n| n.to_str())
-            .unwrap_or("unknown")
-            .to_string();
-
-        let file_path = path.to_string_lossy().to_string();
-        let file_size = std::fs::metadata(path).map(|m| m.len()).unwrap_or(0);
-
-        let (width, height) = self.dimensions();
-        let format = format!("PDF ({} pages)", self.num_pages);
-
-        let basic = BasicMeta {
-            file_name,
-            file_path,
-            format,
-            width,
-            height,
-            file_size,
-            color_type: "Rendered".to_string(),
-        };
-
-        DocumentMeta { basic, exif: None }
-    }
-
-    /// Crop the current page to the specified rectangle.
-    /// Works on rendered output (raster).
-    pub fn crop(&mut self, x: u32, y: u32, width: u32, height: u32) -> Result<(), String> {
-        let (img_width, img_height) = self.rendered.dimensions();
-
-        // Validate crop region
-        if x >= img_width || y >= img_height {
-            return Err(format!(
-                "Crop region ({}, {}) is outside rendered bounds ({}, {})",
-                x, y, img_width, img_height
-            ));
-        }
-
-        // Clamp dimensions
-        let crop_width = width.min(img_width - x);
-        let crop_height = height.min(img_height - y);
-
-        if crop_width == 0 || crop_height == 0 {
-            return Err("Crop region has zero width or height".to_string());
-        }
-
-        // Crop rendered image
-        self.rendered = self.rendered.crop_imm(x, y, crop_width, crop_height);
-
-        // Update handle
-        self.handle = Self::create_image_handle_from_image(&self.rendered);
-
-        Ok(())
-    }
-    fn create_image_handle_from_image(img: &DynamicImage) -> ImageHandle {
-        let (width, height) = img.dimensions();
-        let pixels = img.to_rgba8().into_raw();
-        ImageHandle::from_rgba(width, height, pixels)
-    }
-
-    /// Initialize thumbnail cache (empty, ready for incremental loading).
-    fn init_thumbnail_cache(&mut self) {
-        if self.thumbnail_cache.is_none() {
-            self.thumbnail_cache = Some(Vec::with_capacity(self.num_pages));
-        }
-    }
-
-    /// Generate a single thumbnail page. Returns the next page to generate, or None if done.
-    pub fn generate_thumbnail_page(&mut self, page: usize) -> Option<usize> {
-        // Initialize cache if needed.
-        self.init_thumbnail_cache();
-
-        // Check if we should generate this page.
-        let should_generate = {
-            let cache = self.thumbnail_cache.as_ref()?;
-            page >= cache.len() && page < self.num_pages
-        };
-
-        if should_generate {
-            let handle = self.load_or_generate_thumbnail(page);
-            if let Some(cache) = self.thumbnail_cache.as_mut() {
-                cache.push(handle);
-            }
-        }
-
-        // Return next page if not done.
-        let next = page + 1;
-        if next < self.num_pages {
-            Some(next)
-        } else {
-            None
-        }
-    }
-
-    /// Load thumbnail from cache or generate and cache it.
-    fn load_or_generate_thumbnail(&self, page: usize) -> ImageHandle {
-        // TODO: Re-enable cache once infrastructure layer is set up
-        // if let Some(handle) = cache::load_thumbnail(&self.source_path, page) {
-        //     return handle;
-        // }
-
-        match Self::render_page_at_scale(
-            &self.document,
-            page,
-            RotationMode::Standard(Rotation::None),
-            PDF_THUMBNAIL_SIZE,
-        ) {
-            Ok(img) => {
-                // TODO: Re-enable cache once infrastructure layer is set up
-                // let _ = cache::save_thumbnail(&self.source_path, page, &img);
-                Self::create_image_handle_from_image(&img)
-            }
-            Err(e) => {
-                log::warn!("Failed to generate thumbnail for page {page}: {e}");
-                ImageHandle::from_rgba(1, 1, vec![0, 0, 0, 0])
-            }
-        }
-    }
-
-    /// Render a specific page from the document to an image.
-    fn render_page(
-        document: &PopplerDocument,
-        page_index: usize,
-        rotation: RotationMode,
-    ) -> anyhow::Result<DynamicImage> {
-        Self::render_page_at_scale(document, page_index, rotation, PDF_RENDER_QUALITY)
-    }
-
-    /// Render a specific page at a given scale.
-    fn render_page_at_scale(
-        document: &PopplerDocument,
-        page_index: usize,
-        rotation: RotationMode,
-        scale: f64,
-    ) -> anyhow::Result<DynamicImage> {
-        let page = document
-            .get_page(page_index)
-            .ok_or_else(|| anyhow::anyhow!("Failed to get page {page_index}"))?;
-
-        let (page_width, page_height) = page.get_size();
-        let rotation_degrees = rotation.to_degrees() as i16;
-
-        let (width, height) = if rotation_degrees == 90 || rotation_degrees == 270 {
-            (page_height, page_width)
-        } else {
-            (page_width, page_height)
-        };
-
-        #[allow(clippy::cast_possible_truncation)]
-        let scaled_width = (width * scale) as i32;
-        #[allow(clippy::cast_possible_truncation)]
-        let scaled_height = (height * scale) as i32;
-
-        let surface = ImageSurface::create(Format::ARgb32, scaled_width, scaled_height)
-            .map_err(|e| anyhow::anyhow!("Failed to create Cairo surface: {e}"))?;
-
-        let context = Context::new(&surface)
-            .map_err(|e| anyhow::anyhow!("Failed to create Cairo context: {e}"))?;
-
-        // Fill with white background.
-        context.set_source_rgb(1.0, 1.0, 1.0);
-        let _ = context.paint();
-
-        context.scale(scale, scale);
-
-        if rotation != RotationMode::Standard(Rotation::None) {
-            let center_x = width / 2.0;
-            let center_y = height / 2.0;
-            context.translate(center_x, center_y);
-            context.rotate(f64::from(rotation_degrees) * std::f64::consts::PI / 180.0);
-            context.translate(-page_width / 2.0, -page_height / 2.0);
-        }
-
-        page.render(&context);
-
-        drop(context);
-        surface.flush();
-
-        // Direct conversion from Cairo surface to DynamicImage without PNG round-trip.
-        // This preserves exact pixel data and avoids ARgb32 → PNG → RGBA conversion artifacts.
-        let width = surface.width() as u32;
-        let height = surface.height() as u32;
-        let stride = surface.stride();
-
-        let data = surface
-            .take_data()
-            .map_err(|e| anyhow::anyhow!("Failed to take Cairo surface data: {e}"))?;
-
-        // ARgb32 in Cairo is 4 bytes per pixel (A, R, G, B) with stride padding.
-        // Convert to standard RGBA by copying pixel-by-pixel, skipping stride padding.
-        let mut rgba_bytes = Vec::with_capacity((width * 4) as usize);
-        for y in 0..height {
-            let row_offset = (y as i32 * stride) as usize;
-            for x in 0..width {
-                let col_offset = (x as i32 * 4) as usize;
-                let idx = row_offset + col_offset;
-                // Cairo ARgb32: bytes are [A, R, G, B]
-                let a = data[idx];
-                let r = data[idx + 1];
-                let g = data[idx + 2];
-                let b = data[idx + 3];
-                // Output standard RGBA: [R, G, B, A]
-                rgba_bytes.extend_from_slice(&[r, g, b, a]);
-            }
-        }
-
-        Ok(DynamicImage::ImageRgba8(image::RgbaImage::from_raw(width, height, rgba_bytes)
-            .expect("Failed to create RgbaImage from Cairo surface data")))
-    }
-
-    /// Re-render the current page with current transform.
-    fn rerender(&mut self) {
-        match Self::render_page(&self.document, self.page_index, self.transform.rotation) {
-            Ok(mut rendered) => {
-                // Apply flip transformations to the rendered result
-                if self.transform.flip_h {
-                    rendered = Self::apply_flip(rendered, FlipDirection::Horizontal);
-                }
-                if self.transform.flip_v {
-                    rendered = Self::apply_flip(rendered, FlipDirection::Vertical);
-                }
-                self.rendered = rendered;
-                self.handle = Self::create_image_handle_from_image(&self.rendered);
-            }
-            Err(e) => {
-                log::error!("Failed to render PDF page: {e}");
-            }
-        }
-    }
-
-    fn apply_flip(img: DynamicImage, direction: FlipDirection) -> DynamicImage {
-        use image::imageops::{flip_horizontal, flip_vertical};
-        match direction {
-            FlipDirection::Horizontal => DynamicImage::ImageRgba8(flip_horizontal(&img.to_rgba8())),
-            FlipDirection::Vertical => DynamicImage::ImageRgba8(flip_vertical(&img.to_rgba8())),
-        }
-    }
-
-    /// Navigate to the next page.
-    #[allow(dead_code)]
-    pub fn next_page(&mut self) -> bool {
-        if self.page_index + 1 < self.num_pages {
-            self.page_index += 1;
-            self.rerender();
-            true
-        } else {
-            false
-        }
-    }
-
-    /// Navigate to the previous page.
-    #[allow(dead_code)]
-    pub fn prev_page(&mut self) -> bool {
-        if self.page_index > 0 {
-            self.page_index -= 1;
-            self.rerender();
-            true
-        } else {
-            false
-        }
-    }
-}
-
-// ============================================================================
-// Trait Implementations
-// ============================================================================
-
-impl Renderable for PortableDocument {
-    fn render(&mut self, _scale: f64) -> DocResult<RenderOutput> {
-        // PDF rendering quality is fixed for now (PDF_RENDER_QUALITY)
-        let (width, height) = self.dimensions();
-        Ok(RenderOutput {
-            handle: self.handle.clone(),
-            width,
-            height,
-        })
-    }
-
-    fn info(&self) -> DocumentInfo {
-        let (width, height) = self.dimensions();
-        DocumentInfo {
-            width,
-            height,
-            format: "PDF".to_string(),
-        }
-    }
-}
-
-impl Transformable for PortableDocument {
-    fn rotate(&mut self, rotation: Rotation) {
-        self.transform.rotation = RotationMode::Standard(rotation);
-        self.rerender();
-    }
-
-    fn flip(&mut self, direction: FlipDirection) {
-        match direction {
-            FlipDirection::Horizontal => self.transform.flip_h = !self.transform.flip_h,
-            FlipDirection::Vertical => self.transform.flip_v = !self.transform.flip_v,
-        }
-        self.rerender();
-    }
-
-    fn transform_state(&self) -> TransformState {
-        self.transform
-    }
-}
-
-impl MultiPage for PortableDocument {
-    fn page_count(&self) -> usize {
-        self.num_pages
-    }
-
-    fn current_page(&self) -> usize {
-        self.page_index
-    }
-
-    fn go_to_page(&mut self, page: usize) -> DocResult<()> {
-        if page >= self.num_pages {
-            return Err(anyhow::anyhow!(
-                "Page {} out of range (0-{})",
-                page,
-                self.num_pages - 1
-            ));
-        }
-        self.page_index = page;
-        self.rerender();
-        Ok(())
-    }
-}
-
-impl MultiPageThumbnails for PortableDocument {
-    fn thumbnails_ready(&self) -> bool {
-        self.thumbnail_cache
-            .as_ref()
-            .is_some_and(|c| c.len() >= self.num_pages)
-    }
-
-    fn thumbnails_loaded(&self) -> bool {
-        let loaded = PortableDocument::thumbnails_loaded(self);
-        loaded >= self.num_pages
-    }
-
-    fn generate_thumbnail_page(&mut self, page: usize) -> DocResult<()> {
-        PortableDocument::generate_thumbnail_page(self, page);
-        Ok(())
-    }
-
-    fn generate_all_thumbnails(&mut self) -> DocResult<()> {
-        if self.thumbnails_ready() {
-            return Ok(());
-        }
-        self.init_thumbnail_cache();
-        for page in 0..self.num_pages {
-            PortableDocument::generate_thumbnail_page(self, page);
-        }
-        Ok(())
-    }
-
-    fn get_thumbnail(&mut self, page: usize) -> DocResult<Option<ImageHandle>> {
-        Ok(self
-            .thumbnail_cache
-            .as_ref()
-            .and_then(|cache| cache.get(page).cloned()))
-    }
-}
diff --git a/src/domain/document/types/raster.rs b/src/domain/document/types/raster.rs
deleted file mode 100644
index 85a7027..0000000
--- a/src/domain/document/types/raster.rs
+++ /dev/null
@@ -1,353 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/domain/document/types/raster.rs
-//
-// Raster image document support (PNG, JPEG, WebP, etc.).
-
-use std::path::Path;
-
-use image::{DynamicImage, GenericImageView, ImageReader};
-
-use cosmic::widget::image::Handle as ImageHandle;
-
-use crate::domain::document::core::document::{
-    DocResult, DocumentInfo, FlipDirection, InterpolationQuality, Renderable, RenderOutput,
-    Rotation, RotationMode, TransformState, Transformable,
-};
-
-/// Represents a raster image document (PNG, JPEG, WebP, ...).
-pub struct RasterDocument {
-    /// The decoded image document.
-    document: DynamicImage,
-    /// Native width (original, before transforms).
-    native_width: u32,
-    /// Native height (original, before transforms).
-    native_height: u32,
-    /// Current transformation state.
-    transform: TransformState,
-    /// Cached handle for rendering.
-    handle: ImageHandle,
-    /// Accumulated fine rotation angle in degrees.
-    fine_rotation_angle: f32,
-    /// Interpolation quality for fine rotation and resize operations.
-    interpolation_quality: InterpolationQuality,
-}
-
-impl RasterDocument {
-    /// Load a raster document from disk.
-    pub fn open(path: &Path) -> image::ImageResult<Self> {
-        let document = ImageReader::open(path)?.decode()?;
-        let (native_width, native_height) = document.dimensions();
-        let handle = Self::create_image_handle_from_image(&document);
-
-        Ok(Self {
-            document,
-            native_width,
-            native_height,
-            transform: TransformState::default(),
-            handle,
-            fine_rotation_angle: 0.0,
-            interpolation_quality: InterpolationQuality::default(),
-        })
-    }
-
-    /// Returns the current pixel dimensions (width, height) after transforms.
-    #[must_use]
-    pub fn dimensions(&self) -> (u32, u32) {
-        self.document.dimensions()
-    }
-
-    /// Get the current image handle.
-    #[must_use]
-    pub fn handle(&self) -> ImageHandle {
-        self.handle.clone()
-    }
-
-    /// Save the current document to disk.
-    #[allow(dead_code)]
-    pub fn save(&self, path: &Path) -> image::ImageResult<()> {
-        self.document.save(path)
-    }
-
-    /// Get the underlying `DynamicImage`.
-    #[must_use]
-    pub fn image(&self) -> &DynamicImage {
-        &self.document
-    }
-
-    /// Get native dimensions (before transformations).
-    #[must_use]
-    pub fn native_dimensions(&self) -> (u32, u32) {
-        (self.native_width, self.native_height)
-    }
-
-    /// Get a reference to the rendered image (for cropping from screen coordinates).
-    pub fn get_rendered_image(&self) -> &DynamicImage {
-        &self.document
-    }
-
-    /// Crop the document to a specified rectangular region (in-place).
-    ///
-    /// Coordinates are in pixels relative to the current image dimensions.
-    /// The crop region is clamped to image bounds if it extends beyond.
-    ///
-    /// # Errors
-    ///
-    /// Returns an error if the crop region is completely outside the image bounds.
-    pub fn crop(&mut self, x: u32, y: u32, width: u32, height: u32) -> Result<(), String> {
-        let (img_width, img_height) = self.document.dimensions();
-
-        // Validate crop region
-        if x >= img_width || y >= img_height {
-            return Err(format!(
-                "Crop region ({}, {}) is outside image bounds ({}, {})",
-                x, y, img_width, img_height
-            ));
-        }
-
-        // Clamp dimensions to image bounds
-        let crop_width = width.min(img_width - x);
-        let crop_height = height.min(img_height - y);
-
-        if crop_width == 0 || crop_height == 0 {
-            return Err("Crop region has zero width or height".to_string());
-        }
-
-        // Apply crop
-        self.document = self.document.crop_imm(x, y, crop_width, crop_height);
-
-        // Update native dimensions to the cropped size
-        self.native_width = crop_width;
-        self.native_height = crop_height;
-
-        // Reset transformations since we have a new "native" image
-        self.transform = TransformState::default();
-        self.fine_rotation_angle = 0.0;
-
-        // Regenerate handle
-        self.handle = Self::create_image_handle_from_image(&self.document);
-
-        Ok(())
-    }
-    /// Crop the image to the specified rectangle and return as DynamicImage.
-    ///
-    /// This does NOT modify the document - it's used for exporting cropped images.
-    pub fn crop_to_image(
-        &self,
-        x: u32,
-        y: u32,
-        width: u32,
-        height: u32,
-    ) -> Result<DynamicImage, String> {
-        let (img_width, img_height) = self.document.dimensions();
-
-        // Validate crop region
-        if x >= img_width || y >= img_height {
-            return Err(format!(
-                "Crop rectangle out of bounds: {}x{} at ({}, {}) exceeds image size {}x{}",
-                width, height, x, y, img_width, img_height
-            ));
-        }
-
-        // Clamp dimensions to image bounds
-        let crop_width = width.min(img_width - x);
-        let crop_height = height.min(img_height - y);
-
-        if crop_width == 0 || crop_height == 0 {
-            return Err("Crop region has zero width or height".to_string());
-        }
-
-        let cropped = self.document.crop_imm(x, y, crop_width, crop_height);
-        Ok(cropped)
-    }
-
-    /// Extract metadata for this raster document.
-    ///
-    /// Returns basic metadata (dimensions, format, file size) and EXIF data if available.
-    pub fn extract_meta(
-        &self,
-        path: &Path,
-    ) -> crate::domain::document::core::metadata::DocumentMeta {
-        use crate::domain::document::core::metadata::{BasicMeta, DocumentMeta, ExifMeta};
-
-        let file_name = path
-            .file_name()
-            .and_then(|n| n.to_str())
-            .unwrap_or("unknown")
-            .to_string();
-
-        let file_path = path.to_string_lossy().to_string();
-
-        let file_size = std::fs::metadata(path).map(|m| m.len()).unwrap_or(0);
-
-        // Detect format from path
-        let format = path
-            .extension()
-            .and_then(|e| e.to_str())
-            .unwrap_or("unknown")
-            .to_uppercase();
-
-        let color_type = format!("{:?}", self.document.color());
-
-        let basic = BasicMeta {
-            file_name,
-            file_path,
-            format,
-            width: self.native_width,
-            height: self.native_height,
-            file_size,
-            color_type,
-        };
-
-        // Try to extract EXIF data
-        let exif = std::fs::read(path)
-            .ok()
-            .and_then(|bytes| ExifMeta::from_bytes(&bytes));
-
-        DocumentMeta { basic, exif }
-    }
-
-    /// Resize the document to specific dimensions (for format conversion).
-    ///
-    /// This is useful for converting images to standard paper formats (A4, US Letter, etc.).
-    pub fn resize_to_format(&mut self, target_width: u32, target_height: u32) {
-        use image::imageops::FilterType;
-
-        let filter = match self.interpolation_quality {
-            InterpolationQuality::Fast => FilterType::Nearest,
-            InterpolationQuality::Balanced => FilterType::Triangle,
-            InterpolationQuality::Best => FilterType::CatmullRom,
-        };
-
-        self.document = self
-            .document
-            .resize_exact(target_width, target_height, filter);
-        self.handle = Self::create_image_handle_from_image(&self.document);
-    }
-
-    // Helper functions
-    fn create_image_handle_from_image(img: &DynamicImage) -> ImageHandle {
-        let (width, height) = img.dimensions();
-        let pixels = img.to_rgba8().into_raw();
-        ImageHandle::from_rgba(width, height, pixels)
-    }
-
-    fn apply_rotation(img: DynamicImage, rotation: Rotation) -> DynamicImage {
-        use image::imageops::{rotate180, rotate270, rotate90};
-        match rotation {
-            Rotation::None => img,
-            Rotation::Cw90 => DynamicImage::ImageRgba8(rotate90(&img.to_rgba8())),
-            Rotation::Cw180 => DynamicImage::ImageRgba8(rotate180(&img.to_rgba8())),
-            Rotation::Cw270 => DynamicImage::ImageRgba8(rotate270(&img.to_rgba8())),
-        }
-    }
-
-    fn apply_flip(img: DynamicImage, direction: FlipDirection) -> DynamicImage {
-        use image::imageops::{flip_horizontal, flip_vertical};
-        match direction {
-            FlipDirection::Horizontal => DynamicImage::ImageRgba8(flip_horizontal(&img.to_rgba8())),
-            FlipDirection::Vertical => DynamicImage::ImageRgba8(flip_vertical(&img.to_rgba8())),
-        }
-    }
-}
-
-// ============================================================================
-// Trait Implementations
-// ============================================================================
-
-impl Renderable for RasterDocument {
-    fn render(&mut self, _scale: f64) -> DocResult<RenderOutput> {
-        // Raster images don't re-render at different scales (lossy),
-        // we just return the current handle.
-        let (width, height) = self.dimensions();
-        Ok(RenderOutput {
-            handle: self.handle.clone(),
-            width,
-            height,
-        })
-    }
-
-    fn info(&self) -> DocumentInfo {
-        DocumentInfo {
-            width: self.native_width,
-            height: self.native_height,
-            format: "Raster".to_string(),
-        }
-    }
-}
-
-impl Transformable for RasterDocument {
-    fn rotate(&mut self, rotation: Rotation) {
-        // Extract current rotation in degrees
-        let current_deg = match self.transform.rotation {
-            RotationMode::Standard(r) => r.to_degrees(),
-            RotationMode::Fine(_) => {
-                // If we have fine rotation, reset it and apply standard rotation
-                self.fine_rotation_angle = 0.0;
-                0
-            }
-        };
-
-        let new_deg = rotation.to_degrees();
-        let diff_deg = (new_deg - current_deg + 360) % 360;
-
-        if diff_deg != 0 {
-            let rotation_to_apply = match diff_deg {
-                90 => Rotation::Cw90,
-                180 => Rotation::Cw180,
-                270 => Rotation::Cw270,
-                _ => unreachable!("Invalid rotation diff: {}", diff_deg),
-            };
-            self.document = Self::apply_rotation(
-                std::mem::replace(&mut self.document, DynamicImage::new_rgb8(1, 1)),
-                rotation_to_apply,
-            );
-        }
-
-        // Set to standard rotation mode
-        self.transform.rotation = RotationMode::Standard(rotation);
-        self.handle = Self::create_image_handle_from_image(&self.document);
-    }
-
-    fn flip(&mut self, direction: FlipDirection) {
-        self.document = Self::apply_flip(
-            std::mem::replace(&mut self.document, DynamicImage::new_rgb8(1, 1)),
-            direction,
-        );
-        match direction {
-            FlipDirection::Horizontal => self.transform.flip_h = !self.transform.flip_h,
-            FlipDirection::Vertical => self.transform.flip_v = !self.transform.flip_v,
-        }
-        self.handle = Self::create_image_handle_from_image(&self.document);
-    }
-
-    fn transform_state(&self) -> TransformState {
-        self.transform
-    }
-
-    fn rotate_fine(&mut self, angle_degrees: f32) {
-        // TODO: Re-enable when imageproc dependency is added to Cargo.toml
-        // For now, round to nearest 90-degree rotation
-        log::warn!("Fine rotation not yet implemented, rounding to nearest 90 degrees");
-
-        let rounded = ((angle_degrees / 90.0).round() as i16 * 90) % 360;
-        let rotation = match rounded {
-            0 => Rotation::None,
-            90 => Rotation::Cw90,
-            180 => Rotation::Cw180,
-            270 => Rotation::Cw270,
-            _ => Rotation::None,
-        };
-
-        self.rotate(rotation);
-        self.transform.rotation = RotationMode::Standard(rotation);
-    }
-
-    fn reset_fine_rotation(&mut self) {
-        self.fine_rotation_angle = 0.0;
-        self.transform.rotation = RotationMode::Standard(Rotation::None);
-    }
-
-    fn set_interpolation_quality(&mut self, quality: InterpolationQuality) {
-        self.interpolation_quality = quality;
-    }
-}
diff --git a/src/domain/document/types/vector.rs b/src/domain/document/types/vector.rs
deleted file mode 100644
index 2d0c11c..0000000
--- a/src/domain/document/types/vector.rs
+++ /dev/null
@@ -1,334 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/domain/document/types/vector.rs
-//
-// Vector documents (SVG, etc.).
-
-use std::path::Path;
-
-/// Minimum pixmap size for SVG rendering (prevents zero-size pixmaps).
-const MIN_PIXMAP_SIZE: u32 = 1;
-
-use image::{DynamicImage, GenericImageView, RgbaImage};
-use resvg::tiny_skia::{self, Pixmap};
-use resvg::usvg::{Options, Tree};
-
-use cosmic::widget::image::Handle as ImageHandle;
-
-use crate::domain::document::core::document::{
-    DocResult, DocumentInfo, FlipDirection, Renderable, RenderOutput, Rotation, RotationMode,
-    TransformState, Transformable,
-};
-
-/// Represents a vector document such as SVG.
-pub struct VectorDocument {
-    /// Parsed SVG document for re-rendering at different scales.
-    document: Tree,
-    /// Native width of the SVG (from viewBox or width attribute).
-    native_width: u32,
-    /// Native height of the SVG (from viewBox or height attribute).
-    native_height: u32,
-    /// Current render scale (1.0 = native size).
-    current_scale: f64,
-    /// Accumulated transformations.
-    transform: TransformState,
-    /// Rasterized image at the current scale.
-    pub rendered: DynamicImage,
-    /// Image handle for display.
-    pub handle: ImageHandle,
-    /// Current rendered width.
-    pub width: u32,
-    /// Current rendered height.
-    pub height: u32,
-}
-
-impl VectorDocument {
-    /// Load a vector document from disk.
-    pub fn open(path: &Path) -> anyhow::Result<Self> {
-        let raw_data = std::fs::read_to_string(path)?;
-
-        // Parse SVG with default options.
-        let options = Options::default();
-        let document = Tree::from_str(&raw_data, &options)?;
-
-        // Get native size from the parsed document.
-        let size = document.size();
-        let native_width = size.width().ceil() as u32;
-        let native_height = size.height().ceil() as u32;
-
-        let transform = TransformState::default();
-
-        // Render at native scale (1.0).
-        let (rendered, width, height) =
-            render_document(&document, native_width, native_height, 1.0, transform)?;
-        let handle = Self::create_image_handle_from_image(&rendered);
-
-        Ok(Self {
-            document,
-            native_width,
-            native_height,
-            current_scale: 1.0,
-            transform,
-            rendered,
-            handle,
-            width,
-            height,
-        })
-    }
-
-    /// Returns the dimensions of the rasterized representation.
-    #[must_use]
-    pub fn dimensions(&self) -> (u32, u32) {
-        (self.width, self.height)
-    }
-
-    /// Get the current image handle.
-    #[must_use]
-    pub fn handle(&self) -> ImageHandle {
-        self.handle.clone()
-    }
-
-    /// Get native dimensions (before transformations).
-    #[must_use]
-    pub fn native_dimensions(&self) -> (u32, u32) {
-        (self.native_width, self.native_height)
-    }
-
-    /// Extract metadata for this vector document.
-    pub fn extract_meta(
-        &self,
-        path: &Path,
-    ) -> crate::domain::document::core::metadata::DocumentMeta {
-        use crate::domain::document::core::metadata::{BasicMeta, DocumentMeta};
-
-        let file_name = path
-            .file_name()
-            .and_then(|n| n.to_str())
-            .unwrap_or("unknown")
-            .to_string();
-
-        let file_path = path.to_string_lossy().to_string();
-        let file_size = std::fs::metadata(path).map(|m| m.len()).unwrap_or(0);
-
-        let basic = BasicMeta {
-            file_name,
-            file_path,
-            format: "SVG".to_string(),
-            width: self.native_width,
-            height: self.native_height,
-            file_size,
-            color_type: "Vector".to_string(),
-        };
-
-        DocumentMeta { basic, exif: None }
-    }
-
-    /// Crop the document to the specified rectangle.
-    /// Works on rendered output (raster).
-    pub fn crop(&mut self, x: u32, y: u32, width: u32, height: u32) -> Result<(), String> {
-        let (img_width, img_height) = self.rendered.dimensions();
-
-        // Validate crop region
-        if x >= img_width || y >= img_height {
-            return Err(format!(
-                "Crop region ({}, {}) is outside rendered bounds ({}, {})",
-                x, y, img_width, img_height
-            ));
-        }
-
-        // Clamp dimensions
-        let crop_width = width.min(img_width - x);
-        let crop_height = height.min(img_height - y);
-
-        if crop_width == 0 || crop_height == 0 {
-            return Err("Crop region has zero width or height".to_string());
-        }
-
-        // Crop rendered image
-        self.rendered = self.rendered.crop_imm(x, y, crop_width, crop_height);
-        self.width = crop_width;
-        self.height = crop_height;
-
-        // Update handle
-        self.handle = Self::create_image_handle_from_image(&self.rendered);
-
-        Ok(())
-    }
-
-    /// Re-render the SVG at a new scale, preserving transformations.
-    /// Returns true if re-rendering occurred.
-    #[allow(dead_code)]
-    pub fn render_at_scale(&mut self, scale: f64) -> bool {
-        // Skip if scale hasn't changed
-        if (self.current_scale - scale).abs() < f64::EPSILON {
-            return false;
-        }
-
-        match render_document(
-            &self.document,
-            self.native_width,
-            self.native_height,
-            scale,
-            self.transform,
-        ) {
-            Ok((rendered, width, height)) => {
-                self.current_scale = scale;
-                self.rendered = rendered;
-                self.width = width;
-                self.height = height;
-                self.handle = Self::create_image_handle_from_image(&self.rendered);
-                true
-            }
-            Err(e) => {
-                log::error!("Failed to re-render SVG at scale {scale}: {e}");
-                false
-            }
-        }
-    }
-
-    /// Re-render with current scale and transform.
-    fn rerender(&mut self) {
-        if let Ok((rendered, width, height)) = render_document(
-            &self.document,
-            self.native_width,
-            self.native_height,
-            self.current_scale,
-            self.transform,
-        ) {
-            self.rendered = rendered;
-            self.width = width;
-            self.height = height;
-            self.handle = Self::create_image_handle_from_image(&self.rendered);
-        }
-    }
-
-    // Helper function
-    fn create_image_handle_from_image(img: &image::DynamicImage) -> ImageHandle {
-        let (width, height) = img.dimensions();
-        let pixels = img.to_rgba8().into_raw();
-        ImageHandle::from_rgba(width, height, pixels)
-    }
-}
-
-// ============================================================================
-// Trait Implementations
-// ============================================================================
-
-impl Renderable for VectorDocument {
-    fn render(&mut self, scale: f64) -> DocResult<RenderOutput> {
-        self.render_at_scale(scale);
-        Ok(RenderOutput {
-            handle: self.handle.clone(),
-            width: self.width,
-            height: self.height,
-        })
-    }
-
-    fn info(&self) -> DocumentInfo {
-        DocumentInfo {
-            width: self.native_width,
-            height: self.native_height,
-            format: "SVG".to_string(),
-        }
-    }
-}
-
-impl Transformable for VectorDocument {
-    fn rotate(&mut self, rotation: Rotation) {
-        self.transform.rotation = RotationMode::Standard(rotation);
-        self.rerender();
-    }
-
-    fn flip(&mut self, direction: FlipDirection) {
-        match direction {
-            FlipDirection::Horizontal => self.transform.flip_h = !self.transform.flip_h,
-            FlipDirection::Vertical => self.transform.flip_v = !self.transform.flip_v,
-        }
-        self.rerender();
-    }
-
-    fn transform_state(&self) -> TransformState {
-        self.transform
-    }
-}
-
-/// Render the SVG document at a given scale with transformations.
-fn render_document(
-    document: &Tree,
-    native_width: u32,
-    native_height: u32,
-    scale: f64,
-    transform: TransformState,
-) -> anyhow::Result<(DynamicImage, u32, u32)> {
-    #[allow(clippy::cast_possible_truncation, clippy::cast_sign_loss)]
-    let width = ((f64::from(native_width) * scale).ceil() as u32).max(MIN_PIXMAP_SIZE);
-    #[allow(clippy::cast_possible_truncation, clippy::cast_sign_loss)]
-    let height = ((f64::from(native_height) * scale).ceil() as u32).max(MIN_PIXMAP_SIZE);
-
-    let mut pixmap =
-        Pixmap::new(width, height).ok_or_else(|| anyhow::anyhow!("Failed to create pixmap"))?;
-
-    #[allow(clippy::cast_possible_truncation)]
-    let scale_f32 = scale as f32;
-    let ts = tiny_skia::Transform::from_scale(scale_f32, scale_f32);
-    resvg::render(document, ts, &mut pixmap.as_mut());
-
-    let mut image = pixmap_to_dynamic_image(&pixmap);
-
-    // Apply flip transformations using shared utilities
-    if transform.flip_h {
-        image = crate::domain::document::operations::transform::apply_flip(
-            image,
-            FlipDirection::Horizontal,
-        );
-    }
-    if transform.flip_v {
-        image = crate::domain::document::operations::transform::apply_flip(
-            image,
-            FlipDirection::Vertical,
-        );
-    }
-
-    // Apply rotation using shared utilities
-    image = match transform.rotation {
-        RotationMode::Standard(rotation) => {
-            crate::domain::document::operations::transform::apply_rotation(image, rotation)
-        }
-        RotationMode::Fine(_) => {
-            // For vector documents, fine rotation is handled differently
-            // For now, we just render without rotation
-            // TODO: Implement fine rotation support for vector documents
-            image
-        }
-    };
-
-    let final_width = image.width();
-    let final_height = image.height();
-
-    Ok((image, final_width, final_height))
-}
-
-/// Convert a `tiny_skia` Pixmap to a `DynamicImage`.
-fn pixmap_to_dynamic_image(pixmap: &Pixmap) -> DynamicImage {
-    let width = pixmap.width();
-    let height = pixmap.height();
-
-    // tiny_skia uses premultiplied alpha, we need to unpremultiply for image crate
-    let mut pixels = Vec::with_capacity((width * height * 4) as usize);
-    for pixel in pixmap.pixels() {
-        let a = pixel.alpha();
-        if a == 0 {
-            pixels.extend_from_slice(&[0, 0, 0, 0]);
-        } else {
-            // Unpremultiply: color = premultiplied_color * 255 / alpha
-            let r = (u16::from(pixel.red()) * 255 / u16::from(a)) as u8;
-            let g = (u16::from(pixel.green()) * 255 / u16::from(a)) as u8;
-            let b = (u16::from(pixel.blue()) * 255 / u16::from(a)) as u8;
-            pixels.extend_from_slice(&[r, g, b, a]);
-        }
-    }
-
-    let rgba_image = RgbaImage::from_raw(width, height, pixels)
-        .expect("Failed to create RgbaImage from pixmap data");
-
-    DynamicImage::ImageRgba8(rgba_image)
-}
diff --git a/src/domain/mod.rs b/src/domain/mod.rs
deleted file mode 100644
index c4ad94c..0000000
--- a/src/domain/mod.rs
+++ /dev/null
@@ -1,20 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/domain/mod.rs
-//
-// Domain layer: business logic, document abstractions, and viewport management.
-
-pub mod document;
-
-// Re-export core document types
-#[allow(unused_imports)]
-pub use document::core::content::DocumentContent;
-#[allow(unused_imports)]
-pub use document::core::metadata::DocumentMeta;
-
-// Note: Viewport and error handling were removed to reduce code bloat.
-// - Viewport: Was 865 lines of unused code (planned feature)
-// - Domain Errors: Not integrated, anyhow::Result is sufficient
-//
-// Low-level pixel operations (apply_rotation, apply_flip, crop_image)
-// are internal helpers used only by document type implementations.
-// Use high-level operations for all application and UI code.
diff --git a/src/error.rs b/src/error.rs
new file mode 100644
index 0000000..402a70a
--- /dev/null
+++ b/src/error.rs
@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// src/error.rs
+//
+// Central error and result types for Noctua.
+
+use std::fmt;
+
+pub type Result<T> = std::result::Result<T, Error>;
+
+#[derive(Debug)]
+pub enum Error {
+    /// A requested file or resource was not found.
+    NotFound(String),
+    /// The file format or operation is not supported.
+    Unsupported(String),
+    /// A session could not be loaded or saved.
+    Session(String),
+    /// An underlying I/O error.
+    Io(std::io::Error),
+}
+
+impl fmt::Display for Error {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Error::NotFound(msg) => write!(f, "Not found: {msg}"),
+            Error::Unsupported(msg) => write!(f, "Unsupported: {msg}"),
+            Error::Session(msg) => write!(f, "Session error: {msg}"),
+            Error::Io(err) => write!(f, "I/O error: {err}"),
+        }
+    }
+}
+
+impl std::error::Error for Error {
+    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+        match self {
+            Error::Io(err) => Some(err),
+            _ => None,
+        }
+    }
+}
+
+impl From<std::io::Error> for Error {
+    fn from(err: std::io::Error) -> Self {
+        Error::Io(err)
+    }
+}
diff --git a/src/i18n.rs b/src/i18n.rs
deleted file mode 100644
index 08c2829..0000000
--- a/src/i18n.rs
+++ /dev/null
@@ -1,55 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/i18n.rs
-//
-// Internationalization (i18n) support.
-
-use i18n_embed::{
-    DefaultLocalizer, LanguageLoader, Localizer,
-    fluent::{FluentLanguageLoader, fluent_language_loader},
-    unic_langid::LanguageIdentifier,
-};
-use rust_embed::RustEmbed;
-use std::sync::LazyLock;
-
-/// Applies the requested language(s) to requested translations from the `fl!()` macro.
-pub fn init(requested_languages: &[LanguageIdentifier]) {
-    if let Err(why) = localizer().select(requested_languages) {
-        println!("error while loading fluent localizations: {why}");
-    }
-}
-
-// Get the `Localizer` to be used for localizing this library.
-#[must_use]
-pub fn localizer() -> Box<dyn Localizer> {
-    Box::from(DefaultLocalizer::new(&*LANGUAGE_LOADER, &Localizations))
-}
-
-#[derive(RustEmbed)]
-#[folder = "i18n/"]
-struct Localizations;
-
-pub static LANGUAGE_LOADER: LazyLock<FluentLanguageLoader> = LazyLock::new(|| {
-    let loader: FluentLanguageLoader = fluent_language_loader!();
-
-    loader
-        .load_fallback_language(&Localizations)
-        .expect("Error while loading fallback language");
-
-    loader
-});
-
-/// Request a localized string by ID from the i18n/ directory.
-#[macro_export]
-macro_rules! fl {
-    ($message_id:literal) => {{
-        i18n_embed_fl::fl!($crate::i18n::LANGUAGE_LOADER, $message_id)
-    }};
-
-    ($message_id:literal, $($name:ident: $value:expr),*) => {{
-        let mut args = std::collections::HashMap::new();
-        $(
-            args.insert(stringify!($name), $value.to_string());
-        )*
-        i18n_embed_fl::fl!($crate::i18n::LANGUAGE_LOADER, $message_id, args)
-    }};
-}
diff --git a/src/infrastructure/cache/mod.rs b/src/infrastructure/cache/mod.rs
deleted file mode 100644
index e63c1db..0000000
--- a/src/infrastructure/cache/mod.rs
+++ /dev/null
@@ -1,9 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/infrastructure/cache/mod.rs
-//
-// Cache infrastructure: thumbnail and document caching.
-
-pub mod thumbnail_cache;
-
-// Re-export ThumbnailCache
-pub use thumbnail_cache::ThumbnailCache;
diff --git a/src/infrastructure/cache/thumbnail_cache.rs b/src/infrastructure/cache/thumbnail_cache.rs
deleted file mode 100644
index 5102c54..0000000
--- a/src/infrastructure/cache/thumbnail_cache.rs
+++ /dev/null
@@ -1,149 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/infrastructure/cache/thumbnail_cache.rs
-//
-// Disk cache for document thumbnails stored in ~/.cache/noctua/
-
-use std::fs;
-use std::io::BufWriter;
-use std::path::{Path, PathBuf};
-
-use image::DynamicImage;
-use sha2::{Digest, Sha256};
-
-use cosmic::widget::image::Handle as ImageHandle;
-
-use crate::domain::document::operations::render::create_image_handle_from_image;
-
-/// Cache directory name under ~/.cache/ for thumbnail storage.
-const CACHE_DIR: &str = "noctua";
-
-/// File extension for cached thumbnails.
-const THUMBNAIL_EXT: &str = "png";
-
-/// Thumbnail cache manager for disk-based caching.
-pub struct ThumbnailCache;
-
-impl ThumbnailCache {
-    /// Load a thumbnail from disk cache.
-    /// Returns None if not cached or cache is invalid.
-    pub fn load(file_path: &Path, page: usize) -> Option<ImageHandle> {
-        let cache_path = Self::thumbnail_path(file_path, page)?;
-
-        log::debug!("Cache lookup: file={}, page={}", file_path.display(), page);
-
-        if !cache_path.exists() {
-            log::debug!(
-                "Thumbnail not found in cache: file={} page={}",
-                file_path.display(),
-                page
-            );
-            return None;
-        }
-
-        let img = image::open(&cache_path).ok()?;
-        log::debug!(
-            "Thumbnail loaded from cache: file={} page={}",
-            file_path.display(),
-            page
-        );
-        Some(create_image_handle_from_image(&img))
-    }
-
-    /// Save a thumbnail to disk cache.
-    pub fn save(file_path: &Path, page: usize, image: &DynamicImage) -> Option<()> {
-        let dir = Self::ensure_cache_dir()?;
-        let key = Self::cache_key(file_path, page)?;
-        let cache_path = dir.join(format!("{key}.{THUMBNAIL_EXT}"));
-
-        log::debug!(
-            "Saving thumbnail to cache: file={}, page={}, path={}",
-            file_path.display(),
-            page,
-            cache_path.display()
-        );
-
-        let file = fs::File::create(&cache_path).ok()?;
-        let writer = BufWriter::new(file);
-
-        let res = image.write_to(
-            &mut std::io::BufWriter::new(writer),
-            image::ImageFormat::Png,
-        );
-        match res {
-            Ok(()) => {
-                log::debug!(
-                    "Thumbnail cached successfully: file={} page={}",
-                    file_path.display(),
-                    page
-                );
-                Some(())
-            }
-            Err(e) => {
-                log::warn!(
-                    "Failed to cache thumbnail: file={} page={}: {}",
-                    file_path.display(),
-                    page,
-                    e
-                );
-                None
-            }
-        }
-    }
-
-    /// Clear all cached thumbnails.
-    pub fn clear_cache() -> std::io::Result<()> {
-        if let Some(dir) = Self::cache_dir()
-            && dir.exists()
-        {
-            fs::remove_dir_all(&dir)?;
-        }
-        Ok(())
-    }
-
-    /// Check if a thumbnail exists in cache.
-    #[allow(dead_code)]
-    pub fn has(file_path: &Path, page: usize) -> bool {
-        Self::thumbnail_path(file_path, page).is_some_and(|p| p.exists())
-    }
-
-    // Private helper methods
-
-    /// Get the cache directory path (~/.cache/noctua/).
-    fn cache_dir() -> Option<PathBuf> {
-        dirs::cache_dir().map(|p| p.join(CACHE_DIR))
-    }
-
-    /// Ensure the cache directory exists.
-    fn ensure_cache_dir() -> Option<PathBuf> {
-        let dir = Self::cache_dir()?;
-        fs::create_dir_all(&dir).ok()?;
-        Some(dir)
-    }
-
-    /// Generate a cache key from file path, modification time, and page number.
-    /// Format: sha256(path + mtime + page)
-    fn cache_key(file_path: &Path, page: usize) -> Option<String> {
-        let metadata = fs::metadata(file_path).ok()?;
-        let mtime = metadata
-            .modified()
-            .ok()?
-            .duration_since(std::time::UNIX_EPOCH)
-            .ok()?
-            .as_secs();
-
-        let mut hasher = Sha256::new();
-        hasher.update(file_path.to_string_lossy().as_bytes());
-        hasher.update(mtime.to_le_bytes());
-        hasher.update(page.to_le_bytes());
-
-        let hash = hasher.finalize();
-        Some(format!("{hash:x}"))
-    }
-
-    /// Get the full path for a cached thumbnail.
-    fn thumbnail_path(file_path: &Path, page: usize) -> Option<PathBuf> {
-        let dir = Self::cache_dir()?;
-        let key = Self::cache_key(file_path, page)?;
-        Some(dir.join(format!("{key}.{THUMBNAIL_EXT}")))
-    }
-}
diff --git a/src/infrastructure/filesystem/file_ops.rs b/src/infrastructure/filesystem/file_ops.rs
deleted file mode 100644
index 4fce095..0000000
--- a/src/infrastructure/filesystem/file_ops.rs
+++ /dev/null
@@ -1,189 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/infrastructure/filesystem/file_ops.rs
-//
-// File system operations for document handling.
-
-use std::fs;
-use std::path::{Path, PathBuf};
-
-use anyhow::anyhow;
-
-use crate::domain::document::core::content::{DocumentContent, DocumentKind};
-
-use crate::domain::document::types::raster::RasterDocument;
-#[cfg(feature = "vector")]
-use crate::domain::document::types::vector::VectorDocument;
-#[cfg(feature = "portable")]
-use crate::domain::document::types::portable::PortableDocument;
-
-/// Open a document from a file path and dispatch to the correct type.
-///
-/// Raster formats are delegated to the `image` crate, which decides
-/// based on enabled codecs (e.g. default-formats).
-pub fn open_document(path: &Path) -> anyhow::Result<DocumentContent> {
-    let kind = DocumentKind::from_path(path)
-        .ok_or_else(|| anyhow!("Unsupported document type: {}", path.display()))?;
-
-    let content = match kind {
-        DocumentKind::Raster => {
-            let raster = RasterDocument::open(path)?;
-            DocumentContent::Raster(raster)
-        }
-        #[cfg(feature = "vector")]
-        DocumentKind::Vector => {
-            let vector = VectorDocument::open(path)?;
-            DocumentContent::Vector(vector)
-        }
-        #[cfg(feature = "portable")]
-        DocumentKind::Portable => {
-            let portable = PortableDocument::open(path)?;
-            DocumentContent::Portable(portable)
-        }
-        #[cfg(not(any(feature = "vector", feature = "portable")))]
-        _ => return Err(anyhow!("No document features enabled")),
-    };
-
-    Ok(content)
-}
-
-/// Collect all supported document files from a directory, sorted alphabetically.
-///
-/// This scans the directory and returns a list of files that are recognized as
-/// supported document types (images, PDFs, SVGs, etc.).
-pub fn collect_supported_files(dir: &Path) -> Vec<PathBuf> {
-    let mut entries: Vec<PathBuf> = Vec::new();
-
-    if let Ok(read_dir) = fs::read_dir(dir) {
-        for entry in read_dir.flatten() {
-            let path = entry.path();
-
-            // Only keep regular files that are recognized as supported documents.
-            if path.is_file() && DocumentKind::from_path(&path).is_some() {
-                entries.push(path);
-            }
-        }
-    }
-
-    entries.sort();
-    entries
-}
-
-// ---------------------------------------------------------------------------
-// File metadata helpers
-// ---------------------------------------------------------------------------
-
-/// Retrieve the file size in bytes. Returns 0 if the file cannot be accessed.
-pub fn file_size(path: &Path) -> u64 {
-    fs::metadata(path).map(|m| m.len()).unwrap_or(0)
-}
-
-/// Read raw bytes from a file for metadata extraction (e.g., EXIF).
-/// Returns None if the file cannot be read.
-pub fn read_file_bytes(path: &Path) -> Option<Vec<u8>> {
-    fs::read(path).ok()
-}
-
-// ---------------------------------------------------------------------------
-// DEPRECATED FUNCTIONS
-// ---------------------------------------------------------------------------
-// The following functions have been replaced by DocumentManager and are
-// commented out to avoid AppModel dependencies.
-//
-// Instead of using these functions directly, use:
-// - DocumentManager::open_document() for opening files
-// - DocumentManager::next_document() / previous_document() for navigation
-// - Application commands for operations like crop, save, etc.
-// ---------------------------------------------------------------------------
-
-/*
-/// Open the initial path passed on the command line.
-///
-/// DEPRECATED: Use DocumentManager::open_document() instead.
-pub fn open_initial_path(model: &mut AppModel, path: &PathBuf) {
-    if path.is_dir() {
-        open_from_directory(model, path);
-    } else {
-        open_single_file(model, path);
-    }
-}
-
-/// Open the first supported document from the given directory.
-///
-/// DEPRECATED: Use DocumentManager::open_document() instead.
-pub fn open_from_directory(model: &mut AppModel, dir: &Path) {
-    let entries = collect_supported_files(dir);
-
-    if entries.is_empty() {
-        model.set_error(format!(
-            "No supported documents found in directory: {}",
-            dir.display()
-        ));
-        return;
-    }
-
-    let first = entries[0].clone();
-    model.folder_entries = entries;
-    model.current_index = Some(0);
-
-    load_document_into_model(model, &first);
-}
-
-/// Open a single file.
-///
-/// DEPRECATED: Use DocumentManager::open_document() instead.
-pub fn open_single_file(model: &mut AppModel, path: &Path) {
-    load_document_into_model(model, path);
-
-    if model.document.is_some()
-        && let Some(parent) = path.parent()
-    {
-        refresh_folder_entries(model, parent, path);
-    }
-}
-
-/// Load a document into the model.
-///
-/// DEPRECATED: Use DocumentManager methods instead.
-fn load_document_into_model(model: &mut AppModel, path: &Path) {
-    // Implementation omitted - use DocumentManager instead
-}
-
-/// Refresh folder entries.
-///
-/// DEPRECATED: DocumentManager handles this automatically.
-pub fn refresh_folder_entries(model: &mut AppModel, folder: &Path, current: &Path) {
-    // Implementation omitted - use DocumentManager instead
-}
-
-/// Navigate to the next document.
-///
-/// DEPRECATED: Use DocumentManager::next_document() instead.
-pub fn navigate_next(model: &mut AppModel) {
-    // Implementation omitted - use DocumentManager instead
-}
-
-/// Navigate to the previous document.
-///
-/// DEPRECATED: Use DocumentManager::previous_document() instead.
-pub fn navigate_prev(model: &mut AppModel) {
-    // Implementation omitted - use DocumentManager instead
-}
-
-/// Apply crop operation.
-///
-/// DEPRECATED: Use CropDocumentCommand instead.
-pub fn apply_crop(
-    crop_selection: &CropSelection,
-    doc: &DocumentContent,
-    current_path: &Path,
-    canvas_size: cosmic::iced::Size,
-    image_size: cosmic::iced::Size,
-    scale: f32,
-    pan_x: f32,
-    pan_y: f32,
-    view_mode: &ViewMode,
-) -> Result<PathBuf, String> {
-    // Implementation omitted - use CropDocumentCommand instead
-    Err("Deprecated function - use CropDocumentCommand".to_string())
-}
-*/
diff --git a/src/infrastructure/filesystem/mod.rs b/src/infrastructure/filesystem/mod.rs
deleted file mode 100644
index b8a138c..0000000
--- a/src/infrastructure/filesystem/mod.rs
+++ /dev/null
@@ -1,9 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/infrastructure/filesystem/mod.rs
-//
-// Filesystem operations: file I/O, folder scanning, and file watching.
-
-pub mod file_ops;
-
-// TODO: Re-implement these helpers without UI dependencies
-// pub use file_ops::{file_size, read_file_bytes};
diff --git a/src/infrastructure/loaders/document_loader.rs b/src/infrastructure/loaders/document_loader.rs
deleted file mode 100644
index fb845f5..0000000
--- a/src/infrastructure/loaders/document_loader.rs
+++ /dev/null
@@ -1,148 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/infrastructure/loaders/document_loader.rs
-//
-// Document loader trait and factory for loading documents from files.
-
-use std::path::Path;
-
-use crate::domain::document::core::content::{DocumentContent, DocumentKind};
-use crate::domain::document::core::document::DocResult;
-
-use super::raster_loader::RasterLoader;
-#[cfg(feature = "vector")]
-use super::svg_loader::SvgLoader;
-#[cfg(feature = "portable")]
-use super::pdf_loader::PdfLoader;
-
-/// Trait for loading documents from files.
-///
-/// Implementations handle specific document formats (raster, vector, portable).
-pub trait DocumentLoader {
-    /// Load a document from a file path.
-    fn load(&self, path: &Path) -> DocResult<DocumentContent>;
-
-    /// Check if this loader supports the given file.
-    fn supports(&self, path: &Path) -> bool;
-}
-
-/// Document loader factory.
-///
-/// Detects the document format and delegates to the appropriate loader.
-pub struct DocumentLoaderFactory;
-
-impl DocumentLoaderFactory {
-    /// Create a new document loader factory.
-    #[must_use]
-    pub fn new() -> Self {
-        Self
-    }
-
-    /// Load a document from a file, automatically detecting the format.
-    ///
-    /// # Errors
-    ///
-    /// Returns an error if:
-    /// - The file format is not supported
-    /// - The file cannot be read
-    /// - The document is malformed
-    pub fn load(&self, path: &Path) -> DocResult<DocumentContent> {
-        let kind = DocumentKind::from_path(path).ok_or_else(|| {
-            anyhow::anyhow!(
-                "Unsupported file format: {}",
-                path.extension()
-                    .and_then(|e| e.to_str())
-                    .unwrap_or("unknown")
-            )
-        })?;
-
-        match kind {
-            DocumentKind::Raster => {
-                let loader = RasterLoader;
-                loader.load(path)
-            }
-            #[cfg(feature = "vector")]
-            DocumentKind::Vector => {
-                let loader = SvgLoader;
-                loader.load(path)
-            }
-            #[cfg(feature = "portable")]
-            DocumentKind::Portable => {
-                let loader = PdfLoader;
-                loader.load(path)
-            }
-            #[cfg(not(any(feature = "vector", feature = "portable")))]
-            _ => Err(anyhow::anyhow!(
-                "No document loaders available (check feature flags)"
-            )),
-        }
-    }
-
-    /// Detect the document kind from a file path.
-    #[must_use]
-    pub fn detect_kind(&self, path: &Path) -> Option<DocumentKind> {
-        DocumentKind::from_path(path)
-    }
-
-    /// Check if a file is supported by any loader.
-    #[must_use]
-    pub fn is_supported(&self, path: &Path) -> bool {
-        DocumentKind::from_path(path).is_some()
-    }
-}
-
-impl Default for DocumentLoaderFactory {
-    fn default() -> Self {
-        Self::new()
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_factory_creation() {
-        let factory = DocumentLoaderFactory::new();
-        assert!(std::ptr::eq(&factory, &factory)); // Just a dummy test
-    }
-
-    #[test]
-    fn test_detect_kind() {
-        let factory = DocumentLoaderFactory::new();
-
-        assert_eq!(
-            factory.detect_kind(Path::new("test.png")),
-            Some(DocumentKind::Raster)
-        );
-        assert_eq!(
-            factory.detect_kind(Path::new("test.jpg")),
-            Some(DocumentKind::Raster)
-        );
-
-        #[cfg(feature = "vector")]
-        {
-            assert_eq!(
-                factory.detect_kind(Path::new("test.svg")),
-                Some(DocumentKind::Vector)
-            );
-        }
-
-        #[cfg(feature = "portable")]
-        {
-            assert_eq!(
-                factory.detect_kind(Path::new("test.pdf")),
-                Some(DocumentKind::Portable)
-            );
-        }
-
-        assert_eq!(factory.detect_kind(Path::new("test.txt")), None);
-    }
-
-    #[test]
-    fn test_is_supported() {
-        let factory = DocumentLoaderFactory::new();
-
-        assert!(factory.is_supported(Path::new("test.png")));
-        assert!(!factory.is_supported(Path::new("test.txt")));
-    }
-}
diff --git a/src/infrastructure/loaders/mod.rs b/src/infrastructure/loaders/mod.rs
deleted file mode 100644
index 7ebc923..0000000
--- a/src/infrastructure/loaders/mod.rs
+++ /dev/null
@@ -1,15 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/infrastructure/loaders/mod.rs
-//
-// Document loaders for various formats.
-
-pub mod document_loader;
-
-pub mod raster_loader;
-#[cfg(feature = "vector")]
-pub mod svg_loader;
-#[cfg(feature = "portable")]
-pub mod pdf_loader;
-
-// Re-export main types
-pub use document_loader::DocumentLoaderFactory;
diff --git a/src/infrastructure/loaders/pdf_loader.rs b/src/infrastructure/loaders/pdf_loader.rs
deleted file mode 100644
index 7589820..0000000
--- a/src/infrastructure/loaders/pdf_loader.rs
+++ /dev/null
@@ -1,50 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/infrastructure/loaders/pdf_loader.rs
-//
-// Loader for PDF portable documents.
-
-use std::path::Path;
-
-use crate::domain::document::core::content::DocumentContent;
-use crate::domain::document::core::document::DocResult;
-use crate::domain::document::types::portable::PortableDocument;
-use crate::infrastructure::loaders::document_loader::DocumentLoader;
-
-/// Loader for PDF portable documents.
-pub struct PdfLoader;
-
-impl DocumentLoader for PdfLoader {
-    fn load(&self, path: &Path) -> DocResult<DocumentContent> {
-        let document = PortableDocument::open(path)
-            .map_err(|e| anyhow::anyhow!("Failed to load PDF document: {e}"))?;
-
-        Ok(DocumentContent::Portable(document))
-    }
-
-    fn supports(&self, path: &Path) -> bool {
-        if let Some(ext) = path.extension() {
-            let ext_str = ext.to_string_lossy().to_lowercase();
-            ext_str == "pdf"
-        } else {
-            false
-        }
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_supports() {
-        let loader = PdfLoader;
-
-        assert!(loader.supports(Path::new("test.pdf")));
-        assert!(loader.supports(Path::new("test.PDF")));
-        assert!(loader.supports(Path::new("document.pdf")));
-        assert!(!loader.supports(Path::new("test.png")));
-        assert!(!loader.supports(Path::new("test.svg")));
-        assert!(!loader.supports(Path::new("test.jpg")));
-        assert!(!loader.supports(Path::new("test.txt")));
-    }
-}
diff --git a/src/infrastructure/loaders/raster_loader.rs b/src/infrastructure/loaders/raster_loader.rs
deleted file mode 100644
index 07af388..0000000
--- a/src/infrastructure/loaders/raster_loader.rs
+++ /dev/null
@@ -1,46 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/infrastructure/loaders/raster_loader.rs
-//
-// Loader for raster image documents (PNG, JPEG, WebP, etc.).
-
-use std::path::Path;
-
-use crate::domain::document::core::content::DocumentContent;
-use crate::domain::document::core::document::DocResult;
-use crate::domain::document::types::raster::RasterDocument;
-use crate::infrastructure::loaders::document_loader::DocumentLoader;
-
-/// Loader for raster image documents.
-pub struct RasterLoader;
-
-impl DocumentLoader for RasterLoader {
-    fn load(&self, path: &Path) -> DocResult<DocumentContent> {
-        let document = RasterDocument::open(path)
-            .map_err(|e| anyhow::anyhow!("Failed to load raster document: {e}"))?;
-
-        Ok(DocumentContent::Raster(document))
-    }
-
-    fn supports(&self, path: &Path) -> bool {
-        use cosmic::iced_renderer::graphics::image::image_rs::ImageFormat;
-
-        ImageFormat::from_path(path).is_ok()
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_supports() {
-        let loader = RasterLoader;
-
-        assert!(loader.supports(Path::new("test.png")));
-        assert!(loader.supports(Path::new("test.jpg")));
-        assert!(loader.supports(Path::new("test.jpeg")));
-        assert!(loader.supports(Path::new("test.webp")));
-        assert!(!loader.supports(Path::new("test.pdf")));
-        assert!(!loader.supports(Path::new("test.svg")));
-    }
-}
diff --git a/src/infrastructure/loaders/svg_loader.rs b/src/infrastructure/loaders/svg_loader.rs
deleted file mode 100644
index 042887b..0000000
--- a/src/infrastructure/loaders/svg_loader.rs
+++ /dev/null
@@ -1,49 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/infrastructure/loaders/svg_loader.rs
-//
-// Loader for SVG vector documents.
-
-use std::path::Path;
-
-use crate::domain::document::core::content::DocumentContent;
-use crate::domain::document::core::document::DocResult;
-use crate::domain::document::types::vector::VectorDocument;
-use crate::infrastructure::loaders::document_loader::DocumentLoader;
-
-/// Loader for SVG vector documents.
-pub struct SvgLoader;
-
-impl DocumentLoader for SvgLoader {
-    fn load(&self, path: &Path) -> DocResult<DocumentContent> {
-        let document = VectorDocument::open(path)
-            .map_err(|e| anyhow::anyhow!("Failed to load SVG document: {e}"))?;
-
-        Ok(DocumentContent::Vector(document))
-    }
-
-    fn supports(&self, path: &Path) -> bool {
-        if let Some(ext) = path.extension() {
-            let ext_str = ext.to_string_lossy().to_lowercase();
-            ext_str == "svg" || ext_str == "svgz"
-        } else {
-            false
-        }
-    }
-}
-
-#[cfg(test)]
-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_supports() {
-        let loader = SvgLoader;
-
-        assert!(loader.supports(Path::new("test.svg")));
-        assert!(loader.supports(Path::new("test.SVG")));
-        assert!(loader.supports(Path::new("test.svgz")));
-        assert!(!loader.supports(Path::new("test.png")));
-        assert!(!loader.supports(Path::new("test.pdf")));
-        assert!(!loader.supports(Path::new("test.jpg")));
-    }
-}
diff --git a/src/infrastructure/mod.rs b/src/infrastructure/mod.rs
deleted file mode 100644
index 478c9c3..0000000
--- a/src/infrastructure/mod.rs
+++ /dev/null
@@ -1,13 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/infrastructure/mod.rs
-//
-// Infrastructure layer: external dependencies, loaders, cache, and filesystem.
-
-pub mod cache;
-pub mod filesystem;
-pub mod loaders;
-pub mod system;
-
-// Re-export loader factory
-#[allow(unused_imports)]
-pub use loaders::DocumentLoaderFactory;
diff --git a/src/infrastructure/system/mod.rs b/src/infrastructure/system/mod.rs
deleted file mode 100644
index 7a1068a..0000000
--- a/src/infrastructure/system/mod.rs
+++ /dev/null
@@ -1,9 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/infrastructure/system/mod.rs
-//
-// System integration: wallpaper, desktop environment utilities.
-
-pub mod wallpaper;
-
-// Re-export wallpaper function
-pub use wallpaper::set_as_wallpaper;
diff --git a/src/infrastructure/system/wallpaper.rs b/src/infrastructure/system/wallpaper.rs
deleted file mode 100644
index 6ac377f..0000000
--- a/src/infrastructure/system/wallpaper.rs
+++ /dev/null
@@ -1,159 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/infrastructure/system/wallpaper.rs
-//
-// Set desktop wallpaper across different desktop environments.
-
-use std::path::Path;
-
-/// Set an image as desktop wallpaper using multiple fallback methods.
-///
-/// Attempts the following methods in order:
-/// 1. COSMIC Desktop (direct config file modification)
-/// 2. wallpaper crate (KDE, XFCE, Windows, macOS)
-/// 3. gsettings (GNOME)
-/// 4. feh (tiling window managers)
-pub fn set_as_wallpaper(path: &Path) {
-    // Canonicalize to absolute path.
-    let abs_path = match path.canonicalize() {
-        Ok(p) => p,
-        Err(e) => {
-            log::error!("Failed to canonicalize path {}: {}", path.display(), e);
-            return;
-        }
-    };
-
-    let Some(path_str) = abs_path.to_str() else {
-        log::error!("Invalid UTF-8 in path: {}", abs_path.display());
-        return;
-    };
-
-    log::info!("Attempting to set wallpaper: {path_str}");
-
-    // Method 1: Try COSMIC Desktop (direct config file modification).
-    if try_cosmic_wallpaper(path_str) {
-        return;
-    }
-
-    // Method 2: Try wallpaper crate (supports KDE, XFCE, Windows, macOS).
-    if try_wallpaper_crate(path_str) {
-        return;
-    }
-
-    // Method 3: Try GNOME via gsettings.
-    if try_gsettings_wallpaper(path_str) {
-        return;
-    }
-
-    // Method 4: Try feh (common on tiling WMs like i3, sway).
-    if try_feh_wallpaper(path_str) {
-        return;
-    }
-
-    log::error!("All methods failed to set wallpaper");
-}
-
-/// Try setting wallpaper via COSMIC config file.
-fn try_cosmic_wallpaper(path_str: &str) -> bool {
-    let Some(home) = dirs::home_dir() else {
-        return false;
-    };
-
-    let cosmic_config = home.join(".config/cosmic/com.system76.CosmicBackground/v1/all");
-    if !cosmic_config.exists() {
-        return false;
-    }
-
-    let config_content = format!(
-        r#"(
-    output: "all",
-    source: Path("{path_str}"),
-    filter_by_theme: true,
-    rotation_frequency: 300,
-    filter_method: Lanczos,
-    scaling_mode: Zoom,
-    sampling_method: Alphanumeric,
-)"#
-    );
-
-    match std::fs::write(&cosmic_config, config_content) {
-        Ok(()) => {
-            log::info!("Wallpaper set via COSMIC config");
-            true
-        }
-        Err(e) => {
-            log::warn!("Failed to write COSMIC config: {e}");
-            false
-        }
-    }
-}
-
-/// Try setting wallpaper via wallpaper crate.
-fn try_wallpaper_crate(path_str: &str) -> bool {
-    match wallpaper::set_from_path(path_str) {
-        Ok(()) => {
-            log::info!("Wallpaper set via wallpaper crate");
-            true
-        }
-        Err(e) => {
-            log::warn!("wallpaper crate failed: {e}");
-            false
-        }
-    }
-}
-
-/// Try setting wallpaper via GNOME gsettings.
-fn try_gsettings_wallpaper(path_str: &str) -> bool {
-    let uri = format!("file://{path_str}");
-
-    let output = match std::process::Command::new("gsettings")
-        .args(["set", "org.gnome.desktop.background", "picture-uri", &uri])
-        .output()
-    {
-        Ok(o) => o,
-        Err(e) => {
-            log::warn!("gsettings command failed: {e}");
-            return false;
-        }
-    };
-
-    if !output.status.success() {
-        log::warn!(
-            "gsettings failed: {}",
-            String::from_utf8_lossy(&output.stderr)
-        );
-        return false;
-    }
-
-    log::info!("Wallpaper set via gsettings");
-
-    // Also set dark mode wallpaper.
-    let _ = std::process::Command::new("gsettings")
-        .args([
-            "set",
-            "org.gnome.desktop.background",
-            "picture-uri-dark",
-            &uri,
-        ])
-        .output();
-
-    true
-}
-
-/// Try setting wallpaper via feh.
-fn try_feh_wallpaper(path_str: &str) -> bool {
-    let Ok(output) = std::process::Command::new("feh")
-        .args(["--bg-scale", path_str])
-        .output()
-    else {
-        log::warn!("feh not available");
-        return false;
-    };
-
-    if output.status.success() {
-        log::info!("Wallpaper set via feh");
-        true
-    } else {
-        log::warn!("feh failed");
-        false
-    }
-}
diff --git a/src/main.rs b/src/main.rs
index aa1164a..0478017 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,43 +1,734 @@
 // SPDX-License-Identifier: GPL-3.0-or-later
 // src/main.rs
 //
-// Application entry point.
+// Minimal COSMIC viewer entry point for images and PDFs.
 
-mod ui;
-mod application;
-mod domain;
-mod infrastructure;
-
-mod config;
-mod i18n;
-
-use anyhow::Result;
 use clap::Parser;
-use cosmic::app::Settings;
-use crate::ui::NoctuaApp;
+use cosmic::app::{Core, Settings, Task};
+use cosmic::iced::{
+    event,
+    keyboard::{self, key::Named, Key},
+    mouse, Alignment, ContentFit, Event, Length, Limits, Subscription,
+};
+use cosmic::{executor, theme, widget, Application, Element};
+use std::collections::hash_map::DefaultHasher;
+use std::ffi::OsStr;
+use std::hash::{Hash, Hasher};
+use std::path::{Path, PathBuf};
+use std::process::Command;
 
-#[derive(Parser, Debug, Clone)]
-#[command(version, about)]
-pub struct Args {
-    /// File to open on startup
+#[derive(Parser, Debug)]
+#[command(
+    name = "noctua",
+    version,
+    about = "A document and image viewer for COSMIC"
+)]
+struct Args {
+    /// Files to open.
     #[arg(value_name = "FILE")]
-    pub file: Option<std::path::PathBuf>,
+    files: Vec<PathBuf>,
 
-    /// UI language (e.g. "en", "de")
-    #[arg(short, long, default_value = "en")]
-    pub language: String,
+    /// Compatibility with the previous CLI harness.
+    #[arg(long = "open-document", value_name = "PATH")]
+    document: Option<PathBuf>,
+
+    /// Open all supported documents in a directory.
+    #[arg(long = "open-directory", value_name = "PATH")]
+    directory: Option<PathBuf>,
 }
 
-fn main() -> Result<()> {
-    // Get the system's preferred languages.
-    let requested_languages = i18n_embed::DesktopLanguageRequester::requested_languages();
+#[derive(Clone, Debug, Eq, PartialEq)]
+enum DocumentKind {
+    Raster,
+    Svg,
+    Pdf,
+}
 
-    // Enable localizations to be applied.
-    i18n::init(&requested_languages);
+#[derive(Clone, Debug)]
+struct Document {
+    path: PathBuf,
+    kind: DocumentKind,
+    page: usize,
+    page_count: Option<usize>,
+    rendered_page: Option<PathBuf>,
+    rendering_page: Option<usize>,
+    prefetching_pages: Vec<usize>,
+    error: Option<String>,
+}
+
+impl Document {
+    fn new(path: PathBuf, kind: DocumentKind) -> Self {
+        let page_count = (kind == DocumentKind::Pdf)
+            .then(|| pdf_page_count(&path))
+            .flatten();
+
+        Self {
+            path,
+            kind,
+            page: 0,
+            page_count,
+            rendered_page: None,
+            rendering_page: None,
+            prefetching_pages: Vec::new(),
+            error: None,
+        }
+    }
+
+    fn name(&self) -> String {
+        self.path
+            .file_name()
+            .and_then(OsStr::to_str)
+            .unwrap_or("Noctua")
+            .to_string()
+    }
+}
+
+#[derive(Clone, Debug)]
+struct Flags {
+    documents: Vec<Document>,
+    initial_index: usize,
+}
+
+#[derive(Debug, Clone)]
+enum Message {
+    PreviousDocument,
+    NextDocument,
+    PreviousPage,
+    NextPage,
+    ZoomIn,
+    ZoomOut,
+    ResetZoom,
+    ModifiersChanged(keyboard::Modifiers),
+    Scroll(f32),
+    PdfRendered {
+        path: PathBuf,
+        page: usize,
+        result: Result<PathBuf, String>,
+    },
+    PdfPrefetched {
+        path: PathBuf,
+        page: usize,
+        result: Result<PathBuf, String>,
+    },
+}
+
+struct NoctuaApp {
+    core: Core,
+    documents: Vec<Document>,
+    current: usize,
+    zoom: f32,
+    modifiers: keyboard::Modifiers,
+}
+
+fn main() -> cosmic::iced::Result {
+    env_logger::Builder::from_env(env_logger::Env::default().default_filter_or("warn")).init();
 
-    env_logger::init();
     let args = Args::parse();
+    let flags = Flags::from_args(args);
 
-    cosmic::app::run::<NoctuaApp>(Settings::default(), ui::app::Flags::Args(args))
-        .map_err(|e| anyhow::anyhow!(e))
+    let settings = Settings::default().size_limits(Limits::NONE.min_width(480.0).min_height(320.0));
+
+    cosmic::app::run::<NoctuaApp>(settings, flags)
+}
+
+impl Flags {
+    fn from_args(args: Args) -> Self {
+        let mut requested = args.files;
+
+        if let Some(path) = args.document {
+            requested.push(path);
+        }
+
+        if let Some(path) = args.directory {
+            requested.push(path);
+        }
+
+        let (documents, initial_index) = collect_documents(&requested);
+
+        Self {
+            documents,
+            initial_index,
+        }
+    }
+}
+
+impl Application for NoctuaApp {
+    type Executor = executor::Default;
+    type Flags = Flags;
+    type Message = Message;
+
+    const APP_ID: &'static str = "org.codeberg.wfx.Noctua";
+
+    fn core(&self) -> &Core {
+        &self.core
+    }
+
+    fn core_mut(&mut self) -> &mut Core {
+        &mut self.core
+    }
+
+    fn init(mut core: Core, flags: Self::Flags) -> (Self, Task<Self::Message>) {
+        core.window.content_container = false;
+
+        let current = flags
+            .initial_index
+            .min(flags.documents.len().saturating_sub(1));
+
+        let mut app = Self {
+            core,
+            documents: flags.documents,
+            current,
+            zoom: 1.0,
+            modifiers: keyboard::Modifiers::default(),
+        };
+
+        app.refresh_title();
+        let task = app.ensure_current_rendered();
+
+        (app, task)
+    }
+
+    fn update(&mut self, message: Self::Message) -> Task<Self::Message> {
+        match message {
+            Message::PreviousDocument => {
+                if self.current > 0 {
+                    self.current -= 1;
+                    self.zoom = 1.0;
+                }
+            }
+            Message::NextDocument => {
+                if self.current + 1 < self.documents.len() {
+                    self.current += 1;
+                    self.zoom = 1.0;
+                }
+            }
+            Message::PreviousPage => {
+                self.previous_pdf_page();
+            }
+            Message::NextPage => {
+                self.next_pdf_page();
+            }
+            Message::ZoomIn => {
+                self.zoom_in();
+            }
+            Message::ZoomOut => {
+                self.zoom_out();
+            }
+            Message::ResetZoom => {
+                self.zoom = 1.0;
+            }
+            Message::ModifiersChanged(modifiers) => {
+                self.modifiers = modifiers;
+            }
+            Message::Scroll(delta) => {
+                if self.modifiers.control() {
+                    if delta > 0.0 {
+                        self.zoom_in();
+                    } else if delta < 0.0 {
+                        self.zoom_out();
+                    }
+                } else if delta > 0.0 {
+                    self.previous_pdf_page();
+                } else if delta < 0.0 {
+                    self.next_pdf_page();
+                }
+            }
+            Message::PdfRendered { path, page, result } => {
+                if let Some(document) = self
+                    .documents
+                    .iter_mut()
+                    .find(|document| document.path == path)
+                {
+                    if document.rendering_page == Some(page) {
+                        document.rendering_page = None;
+                    }
+
+                    if document.page == page {
+                        match result {
+                            Ok(rendered) => {
+                                document.rendered_page = Some(rendered);
+                                document.error = None;
+                            }
+                            Err(err) => {
+                                document.rendered_page = None;
+                                document.error = Some(err);
+                            }
+                        }
+                    }
+                }
+            }
+            Message::PdfPrefetched { path, page, result } => {
+                if let Some(document) = self
+                    .documents
+                    .iter_mut()
+                    .find(|document| document.path == path)
+                {
+                    document
+                        .prefetching_pages
+                        .retain(|pending| *pending != page);
+
+                    if document.page == page && document.rendered_page.is_none() {
+                        if let Ok(rendered) = result {
+                            document.rendered_page = Some(rendered);
+                            document.error = None;
+                        }
+                    }
+                }
+            }
+        }
+
+        self.refresh_title();
+
+        self.ensure_current_rendered()
+    }
+
+    fn subscription(&self) -> Subscription<Self::Message> {
+        event::listen_raw(|event, status, _| match event {
+            Event::Keyboard(keyboard::Event::ModifiersChanged(modifiers)) => {
+                Some(Message::ModifiersChanged(modifiers))
+            }
+            Event::Keyboard(keyboard::Event::KeyPressed {
+                key: Key::Named(Named::PageUp | Named::ArrowUp | Named::ArrowLeft),
+                ..
+            }) if status == event::Status::Ignored => Some(Message::PreviousPage),
+            Event::Keyboard(keyboard::Event::KeyPressed {
+                key: Key::Named(Named::PageDown | Named::ArrowDown | Named::ArrowRight),
+                ..
+            }) if status == event::Status::Ignored => Some(Message::NextPage),
+            Event::Mouse(mouse::Event::WheelScrolled { delta })
+                if status == event::Status::Ignored =>
+            {
+                scroll_delta_y(delta).map(Message::Scroll)
+            }
+            _ => None,
+        })
+    }
+
+    fn view(&self) -> Element<'_, Self::Message> {
+        let content = match self.current_document() {
+            Some(document) => self.document_view(document),
+            None => empty_view("No document selected"),
+        };
+
+        widget::container(content)
+            .width(Length::Fill)
+            .height(Length::Fill)
+            .center_x(Length::Fill)
+            .center_y(Length::Fill)
+            .class(theme::Container::WindowBackground)
+            .into()
+    }
+
+    fn footer(&self) -> Option<Element<'_, Self::Message>> {
+        let Some(document) = self.current_document() else {
+            return None;
+        };
+
+        let has_previous_document = self.current > 0;
+        let has_next_document = self.current + 1 < self.documents.len();
+        let has_previous_page = document.kind == DocumentKind::Pdf && document.page > 0;
+        let has_next_page = document.kind == DocumentKind::Pdf
+            && document
+                .page_count
+                .is_none_or(|page_count| document.page + 1 < page_count);
+
+        let page_label = if document.kind == DocumentKind::Pdf {
+            match document.page_count {
+                Some(page_count) => format!("Page {} / {}", document.page + 1, page_count),
+                None => format!("Page {}", document.page + 1),
+            }
+        } else {
+            format!("{} / {}", self.current + 1, self.documents.len())
+        };
+
+        let row = widget::row::with_capacity(9)
+            .align_y(Alignment::Center)
+            .spacing(8)
+            .padding(8)
+            .push(
+                widget::button::standard("Previous")
+                    .on_press_maybe(has_previous_document.then_some(Message::PreviousDocument)),
+            )
+            .push(
+                widget::button::standard("Next")
+                    .on_press_maybe(has_next_document.then_some(Message::NextDocument)),
+            )
+            .push(widget::space::horizontal().width(Length::Fill))
+            .push(
+                widget::button::standard("-")
+                    .on_press(Message::ZoomOut)
+                    .width(Length::Fixed(36.0)),
+            )
+            .push(widget::button::standard("100%").on_press(Message::ResetZoom))
+            .push(
+                widget::button::standard("+")
+                    .on_press(Message::ZoomIn)
+                    .width(Length::Fixed(36.0)),
+            )
+            .push(widget::space::horizontal().width(Length::Fill))
+            .push(widget::text::body(page_label))
+            .push(
+                widget::button::standard("Prev page")
+                    .on_press_maybe(has_previous_page.then_some(Message::PreviousPage)),
+            )
+            .push(
+                widget::button::standard("Next page")
+                    .on_press_maybe(has_next_page.then_some(Message::NextPage)),
+            );
+
+        Some(row.into())
+    }
+}
+
+impl NoctuaApp {
+    fn zoom_in(&mut self) {
+        self.zoom = (self.zoom * 1.2).min(5.0);
+    }
+
+    fn zoom_out(&mut self) {
+        self.zoom = (self.zoom / 1.2).max(0.2);
+    }
+
+    fn previous_pdf_page(&mut self) {
+        if let Some(document) = self.current_document_mut() {
+            if document.kind == DocumentKind::Pdf && document.page > 0 {
+                document.page -= 1;
+                document.rendered_page = None;
+                document.error = None;
+            }
+        }
+    }
+
+    fn next_pdf_page(&mut self) {
+        if let Some(document) = self.current_document_mut() {
+            if document.kind == DocumentKind::Pdf {
+                let page_count = document.page_count.unwrap_or(document.page + 2);
+                if document.page + 1 < page_count {
+                    document.page += 1;
+                    document.rendered_page = None;
+                    document.error = None;
+                }
+            }
+        }
+    }
+
+    fn current_document(&self) -> Option<&Document> {
+        self.documents.get(self.current)
+    }
+
+    fn current_document_mut(&mut self) -> Option<&mut Document> {
+        self.documents.get_mut(self.current)
+    }
+
+    fn refresh_title(&mut self) {
+        let title = self
+            .current_document()
+            .map_or_else(|| "Noctua".to_string(), Document::name);
+
+        self.core.set_header_title(title);
+    }
+
+    fn ensure_current_rendered(&mut self) -> Task<Message> {
+        let render_task = {
+            let Some(document) = self.current_document_mut() else {
+                return Task::none();
+            };
+
+            if document.kind != DocumentKind::Pdf {
+                return Task::none();
+            }
+
+            if document.rendered_page.is_some() {
+                return self.ensure_adjacent_rendered();
+            }
+
+            if document.rendering_page == Some(document.page) {
+                return Task::none();
+            }
+
+            if let Some(cached) = cached_pdf_page(&document.path, document.page) {
+                document.rendered_page = Some(cached);
+                document.error = None;
+                document.rendering_page = None;
+                return self.ensure_adjacent_rendered();
+            }
+
+            document.rendering_page = Some(document.page);
+            document.error = None;
+
+            render_pdf_task(
+                document.path.clone(),
+                document.page,
+                |path, page, result| Message::PdfRendered { path, page, result },
+            )
+        };
+
+        Task::batch([render_task, self.ensure_adjacent_rendered()])
+    }
+
+    fn ensure_adjacent_rendered(&mut self) -> Task<Message> {
+        let Some(document) = self.current_document_mut() else {
+            return Task::none();
+        };
+
+        if document.kind != DocumentKind::Pdf || document.rendered_page.is_none() {
+            return Task::none();
+        }
+
+        let mut pages = Vec::with_capacity(2);
+        if document
+            .page_count
+            .is_none_or(|page_count| document.page + 1 < page_count)
+        {
+            pages.push(document.page + 1);
+        }
+        if document.page > 0 {
+            pages.push(document.page - 1);
+        }
+
+        let path = document.path.clone();
+        let pages = pages
+            .into_iter()
+            .filter(|page| document.rendering_page != Some(*page))
+            .filter(|page| !document.prefetching_pages.contains(page))
+            .filter(|page| cached_pdf_page(&path, *page).is_none())
+            .collect::<Vec<_>>();
+
+        document.prefetching_pages.extend(pages.iter().copied());
+
+        let tasks = pages
+            .into_iter()
+            .map(|page| {
+                render_pdf_task(path.clone(), page, |path, page, result| {
+                    Message::PdfPrefetched { path, page, result }
+                })
+            })
+            .collect::<Vec<_>>();
+
+        Task::batch(tasks)
+    }
+
+    fn document_view(&self, document: &Document) -> Element<'_, Message> {
+        if let Some(error) = &document.error {
+            return empty_view(error);
+        }
+
+        match document.kind {
+            DocumentKind::Raster => widget::image(widget::image::Handle::from_path(&document.path))
+                .content_fit(ContentFit::Contain)
+                .width(Length::Fill)
+                .height(Length::Fill)
+                .scale(self.zoom)
+                .into(),
+            DocumentKind::Svg => widget::svg(widget::svg::Handle::from_path(&document.path))
+                .content_fit(ContentFit::Contain)
+                .width(Length::Fill)
+                .height(Length::Fill)
+                .into(),
+            DocumentKind::Pdf => match &document.rendered_page {
+                Some(path) => widget::image(widget::image::Handle::from_path(path))
+                    .content_fit(ContentFit::Contain)
+                    .width(Length::Fill)
+                    .height(Length::Fill)
+                    .scale(self.zoom)
+                    .into(),
+                None => empty_view("Rendering PDF page..."),
+            },
+        }
+    }
+}
+
+fn empty_view<'a>(message: impl Into<String>) -> Element<'a, Message> {
+    widget::column::with_capacity(3)
+        .align_x(Alignment::Center)
+        .spacing(8)
+        .push(widget::space::vertical())
+        .push(widget::icon::from_name("image-x-generic-symbolic").size(64))
+        .push(widget::text::body(message.into()))
+        .push(widget::space::vertical())
+        .width(Length::Fill)
+        .height(Length::Fill)
+        .into()
+}
+
+fn scroll_delta_y(delta: mouse::ScrollDelta) -> Option<f32> {
+    let y = match delta {
+        mouse::ScrollDelta::Lines { y, .. } => y,
+        mouse::ScrollDelta::Pixels { y, .. } => y / 60.0,
+    };
+
+    (y.abs() > f32::EPSILON).then_some(y)
+}
+
+fn collect_documents(requested: &[PathBuf]) -> (Vec<Document>, usize) {
+    if requested.is_empty() {
+        return (Vec::new(), 0);
+    }
+
+    if requested.len() == 1 {
+        let path = &requested[0];
+
+        if path.is_dir() {
+            return (scan_directory(path), 0);
+        }
+
+        if let Some(parent) = path.parent() {
+            let documents = scan_directory(parent);
+            if let Some(index) = documents
+                .iter()
+                .position(|document| same_path(&document.path, path))
+            {
+                return (documents, index);
+            }
+        }
+    }
+
+    let documents = requested
+        .iter()
+        .flat_map(|path| {
+            if path.is_dir() {
+                scan_directory(path)
+            } else {
+                detect_kind(path)
+                    .map(|kind| vec![Document::new(path.clone(), kind)])
+                    .unwrap_or_default()
+            }
+        })
+        .collect();
+
+    (documents, 0)
+}
+
+fn scan_directory(dir: &Path) -> Vec<Document> {
+    let Ok(entries) = std::fs::read_dir(dir) else {
+        return Vec::new();
+    };
+
+    let mut paths = entries
+        .filter_map(Result::ok)
+        .map(|entry| entry.path())
+        .filter(|path| path.is_file())
+        .filter_map(|path| detect_kind(&path).map(|kind| (path, kind)))
+        .collect::<Vec<_>>();
+
+    paths.sort_by(|(left, _), (right, _)| left.cmp(right));
+
+    paths
+        .into_iter()
+        .map(|(path, kind)| Document::new(path, kind))
+        .collect()
+}
+
+fn detect_kind(path: &Path) -> Option<DocumentKind> {
+    match path
+        .extension()
+        .and_then(OsStr::to_str)
+        .map(str::to_ascii_lowercase)
+        .as_deref()
+    {
+        Some("pdf") => Some(DocumentKind::Pdf),
+        Some("svg") => Some(DocumentKind::Svg),
+        Some("png" | "jpg" | "jpeg" | "webp" | "gif" | "bmp" | "tiff" | "tif") => {
+            Some(DocumentKind::Raster)
+        }
+        _ => None,
+    }
+}
+
+fn same_path(left: &Path, right: &Path) -> bool {
+    left == right || left.canonicalize().ok().as_deref() == right.canonicalize().ok().as_deref()
+}
+
+fn pdf_page_count(path: &Path) -> Option<usize> {
+    let output = Command::new("pdfinfo").arg(path).output().ok()?;
+
+    if !output.status.success() {
+        return None;
+    }
+
+    let stdout = String::from_utf8_lossy(&output.stdout);
+    stdout.lines().find_map(|line| {
+        line.strip_prefix("Pages:")
+            .and_then(|value| value.trim().parse::<usize>().ok())
+    })
+}
+
+fn render_pdf_task(
+    path: PathBuf,
+    page: usize,
+    on_done: impl FnOnce(PathBuf, usize, Result<PathBuf, String>) -> Message + Send + 'static,
+) -> Task<Message> {
+    Task::perform(
+        async move {
+            let result = render_pdf_page(&path, page);
+            (path, page, result)
+        },
+        move |(path, page, result)| cosmic::Action::App(on_done(path, page, result)),
+    )
+}
+
+fn cached_pdf_page(path: &Path, page: usize) -> Option<PathBuf> {
+    let output = pdf_page_output(path, page);
+    output.exists().then_some(output)
+}
+
+fn pdf_page_output(path: &Path, page: usize) -> PathBuf {
+    std::env::temp_dir()
+        .join(format!(
+            "noctua-pdf-{}-{}",
+            path_hash(path),
+            page.saturating_add(1)
+        ))
+        .with_extension("png")
+}
+
+fn render_pdf_page(path: &Path, page: usize) -> Result<PathBuf, String> {
+    if let Some(cached) = cached_pdf_page(path, page) {
+        return Ok(cached);
+    }
+
+    let output = pdf_page_output(path, page);
+    let prefix = output.with_extension("");
+
+    let status = Command::new("pdftocairo")
+        .arg("-png")
+        .arg("-singlefile")
+        .arg("-f")
+        .arg(page.saturating_add(1).to_string())
+        .arg("-l")
+        .arg(page.saturating_add(1).to_string())
+        .arg("-scale-to")
+        .arg("2400")
+        .arg(path)
+        .arg(&prefix)
+        .status()
+        .map_err(|err| format!("Failed to run pdftocairo: {err}"))?;
+
+    if status.success() && output.exists() {
+        Ok(output)
+    } else {
+        Err(format!(
+            "Failed to render page {} of {}",
+            page.saturating_add(1),
+            path.display()
+        ))
+    }
+}
+
+fn path_hash(path: &Path) -> u64 {
+    let mut hasher = DefaultHasher::new();
+
+    match path.canonicalize() {
+        Ok(path) => path.hash(&mut hasher),
+        Err(_) => path.hash(&mut hasher),
+    }
+
+    if let Ok(metadata) = path.metadata() {
+        metadata.len().hash(&mut hasher);
+        if let Ok(modified) = metadata.modified() {
+            modified.hash(&mut hasher);
+        }
+    }
+
+    hasher.finish()
 }
diff --git a/src/patch.rs b/src/patch.rs
new file mode 100644
index 0000000..2e44fcd
--- /dev/null
+++ b/src/patch.rs
@@ -0,0 +1,338 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// src/patch.rs
+//
+// Patch file executor for scripted workspace operations and testing.
+
+use crate::active_state::ActiveState;
+use crate::workspace::model::{Item, ItemKind, Session, SessionType, Workspace};
+use anyhow::{bail, Context, Result};
+use serde::Deserialize;
+use std::path::{Path, PathBuf};
+
+/// A single step in a patch file. Each variant maps directly to a JSON key.
+#[derive(Debug, Deserialize)]
+pub enum PatchStep {
+    NewWorkspace(String),
+    LoadWorkspace(String),
+    SaveWorkspace(String),
+
+    CreateSession {
+        name: String,
+        session_type: String,
+    },
+    DeleteSession(String),
+    CopySession(String),
+    RenameSession {
+        session: String,
+        name: String,
+    },
+
+    AddItem {
+        session: String,
+        name: String,
+        kind: String,
+        path: String,
+    },
+    RemoveItem {
+        session: String,
+        item: String,
+    },
+    RenameItem {
+        session: String,
+        item: String,
+        name: String,
+    },
+    CopyItem {
+        from: String,
+        item: String,
+        to: String,
+    },
+    MoveItem {
+        from: String,
+        item: String,
+        to: String,
+    },
+
+    SelectSession(String),
+    SelectItem(usize),
+    NextItem,
+    PreviousItem,
+    MoveItemUp,
+    MoveItemDown,
+    MoveItemToIndex(usize),
+
+    ViewWorkspace,
+    ViewSession(String),
+}
+
+pub fn load(path: &Path) -> Result<Vec<PatchStep>> {
+    let content = std::fs::read_to_string(path).context("Failed to read patch file")?;
+    serde_json::from_str(&content).context("Failed to parse patch file")
+}
+
+pub fn run(path: &Path) {
+    let steps = match load(path) {
+        Ok(s) => s,
+        Err(e) => {
+            eprintln!("patch: {e}");
+            return;
+        }
+    };
+
+    let total = steps.len();
+    let width = total.to_string().len();
+
+    println!("patch: '{}' ({total} steps)\n", path.display());
+
+    let mut ws = Workspace::new("untitled");
+    let mut active = ActiveState::new();
+
+    for (i, step) in steps.into_iter().enumerate() {
+        let n = i + 1;
+        print!("[{n:>width$}/{total}] ");
+        if let Err(e) = execute(step, &mut ws, &mut active) {
+            println!("[ERR] {e}");
+        }
+    }
+
+    println!("\npatch: done.");
+}
+
+fn execute(step: PatchStep, ws: &mut Workspace, active: &mut ActiveState) -> Result<()> {
+    match step {
+        PatchStep::NewWorkspace(name) => {
+            println!("New Workspace {name:?}");
+            *ws = Workspace::new(&name);
+            active.reset();
+        }
+        PatchStep::LoadWorkspace(path) => {
+            *ws = Workspace::load(&path)?;
+            active.reset();
+            println!("Load Workspace {path:?} ({} sessions)", ws.sessions.len());
+        }
+        PatchStep::SaveWorkspace(path) => {
+            ws.save(&path)?;
+            println!("Save Workspace {path:?}");
+        }
+
+        PatchStep::CreateSession { name, session_type } => {
+            let st = parse_session_type(&session_type)?;
+            let session = Session::new(&name, st);
+            let id = session.id;
+            ws.add_session(session);
+            active.select_session_by_id(ws, id)?;
+            println!("Create Session {name:?}");
+        }
+        PatchStep::DeleteSession(name) => {
+            let id = ws.session_by_name(&name)?.id;
+            ws.remove_session(id)?;
+            if active.active_session_id() == Some(id) {
+                active.clear_session();
+            }
+            println!("Delete Session {name:?}");
+        }
+        PatchStep::CopySession(name) => {
+            let id = ws.session_by_name(&name)?.id;
+            let new_id = ws.copy_session(id)?;
+            let new_name = ws.session(new_id)?.name.clone();
+            active.select_session_by_id(ws, new_id)?;
+            println!("Copy Session {name:?} -> {new_name:?}");
+        }
+        PatchStep::RenameSession { session, name } => {
+            let id = ws.session_by_name(&session)?.id;
+            ws.rename_session(id, &name)?;
+            println!("Rename Session {session:?} -> {name:?}");
+        }
+
+        PatchStep::AddItem {
+            session,
+            name,
+            kind,
+            path,
+        } => {
+            let sid = ws.session_by_name(&session)?.id;
+            let item = Item::new(&name, parse_item_kind(&kind, &path)?);
+            ws.add_item(sid, item)?;
+            if active.active_session_id() == Some(sid) {
+                active.select_last_item(ws);
+            }
+            println!("Add Item {name:?} to {session:?}");
+        }
+        PatchStep::RemoveItem { session, item } => {
+            let sid = ws.session_by_name(&session)?.id;
+            let iid = ws.item_by_name(sid, &item)?.id;
+            ws.remove_item(sid, iid)?;
+            if active.active_session_id() == Some(sid) {
+                active.adjust_after_remove(ws);
+            }
+            println!("Remove Item {item:?} from {session:?}");
+        }
+        PatchStep::RenameItem {
+            session,
+            item,
+            name,
+        } => {
+            let sid = ws.session_by_name(&session)?.id;
+            let iid = ws.item_by_name(sid, &item)?.id;
+            ws.rename_item(sid, iid, &name)?;
+            println!("Rename Item {item:?} -> {name:?}");
+        }
+        PatchStep::CopyItem { from, item, to } => {
+            let from_id = ws.session_by_name(&from)?.id;
+            let iid = ws.item_by_name(from_id, &item)?.id;
+            let to_id = ws.session_by_name(&to)?.id;
+            ws.copy_item(from_id, iid, to_id, usize::MAX)?;
+            println!("Copy Item {item:?}: {from:?} -> {to:?}");
+        }
+        PatchStep::MoveItem { from, item, to } => {
+            let from_id = ws.session_by_name(&from)?.id;
+            let iid = ws.item_by_name(from_id, &item)?.id;
+            let to_id = ws.session_by_name(&to)?.id;
+            ws.move_item(from_id, iid, to_id, usize::MAX)?;
+            if active.active_session_id() == Some(from_id) {
+                active.adjust_after_remove(ws);
+            }
+            println!("Move Item {item:?}: {from:?} -> {to:?}");
+        }
+
+        PatchStep::SelectSession(name) => {
+            active.select_session(ws, &name)?;
+            println!("Select Session {name:?}");
+            print_context(ws, active);
+        }
+        PatchStep::SelectItem(index) => {
+            active.select_item(ws, index)?;
+            println!("Select Item [{index}]");
+            print_context(ws, active);
+        }
+        PatchStep::NextItem => {
+            active.next_item(ws);
+            println!("Next Item");
+            print_context(ws, active);
+        }
+        PatchStep::PreviousItem => {
+            active.previous_item();
+            println!("Previous Item");
+            print_context(ws, active);
+        }
+        PatchStep::MoveItemUp => {
+            let sid = active.active_session_id().context("No active session")?;
+            let idx = active.active_item_index().context("No active item")?;
+            if idx == 0 {
+                bail!("Already at top")
+            }
+            let iid = active.active_item_id(ws).context("No active item")?;
+            ws.move_item(sid, iid, sid, idx - 1)?;
+            active.select_item(ws, idx - 1)?;
+            println!("Move Item Up");
+            print_context(ws, active);
+        }
+        PatchStep::MoveItemDown => {
+            let sid = active.active_session_id().context("No active session")?;
+            let idx = active.active_item_index().context("No active item")?;
+            let count = active.active_session(ws).map_or(0, |s| s.items.len());
+            if idx + 1 >= count {
+                bail!("Already at bottom")
+            }
+            let iid = active.active_item_id(ws).context("No active item")?;
+            ws.move_item(sid, iid, sid, idx + 1)?;
+            active.select_item(ws, idx + 1)?;
+            println!("Move Item Down");
+            print_context(ws, active);
+        }
+        PatchStep::MoveItemToIndex(target) => {
+            let sid = active.active_session_id().context("No active session")?;
+            let iid = active.active_item_id(ws).context("No active item")?;
+            ws.move_item(sid, iid, sid, target)?;
+            let count = active.active_session(ws).map_or(0, |s| s.items.len());
+            active.select_item(ws, target.min(count.saturating_sub(1)))?;
+            println!("Move Item To [{target}]");
+            print_context(ws, active);
+        }
+
+        PatchStep::ViewWorkspace => {
+            println!(
+                "View Workspace {:?}  {} sessions",
+                ws.name,
+                ws.sessions.len()
+            );
+            for s in &ws.sessions {
+                let m = if active.active_session_id() == Some(s.id) {
+                    "=>"
+                } else {
+                    "  "
+                };
+                println!(
+                    "           {m} {:?} ({:?})  {} items",
+                    s.name,
+                    s.session_type,
+                    s.items.len()
+                );
+            }
+        }
+        PatchStep::ViewSession(name) => {
+            let session = ws.session_by_name(&name)?;
+            println!(
+                "View Session {:?} ({:?})  {} items",
+                session.name,
+                session.session_type,
+                session.items.len()
+            );
+            for (i, item) in session.items.iter().enumerate() {
+                let m = if active.active_session_id() == Some(session.id)
+                    && active.active_item_index() == Some(i)
+                {
+                    "=>"
+                } else {
+                    "  "
+                };
+                let kind = match &item.kind {
+                    ItemKind::Portable { .. } => "portable",
+                    ItemKind::Raster { .. } => "raster",
+                    ItemKind::Vector { .. } => "vector",
+                    ItemKind::Document { .. } => "document",
+                };
+                println!("           {m} [{i}] {:?} ({kind})", item.name);
+            }
+        }
+    }
+    Ok(())
+}
+
+fn print_context(ws: &Workspace, active: &ActiveState) {
+    let Some(session) = active.active_session(ws) else {
+        return;
+    };
+    let item_info = match active.active_item(ws) {
+        Some(item) => format!(
+            "[{}] {:?}",
+            active.active_item_index().unwrap_or(0),
+            item.name
+        ),
+        None => "-".into(),
+    };
+    println!(
+        "         {:?}  {} items  active: {item_info}",
+        session.name,
+        session.items.len()
+    );
+}
+
+fn parse_session_type(s: &str) -> Result<SessionType> {
+    match s.to_lowercase().as_str() {
+        "browser" => Ok(SessionType::Browser),
+        "collection" => Ok(SessionType::Collection),
+        _ => bail!("Unknown session type: {s:?}"),
+    }
+}
+
+fn parse_item_kind(kind: &str, path: &str) -> Result<ItemKind> {
+    let path = PathBuf::from(path);
+    match kind.to_lowercase().as_str() {
+        "portable" | "pdf" => Ok(ItemKind::Portable { path }),
+        "raster" | "image" => Ok(ItemKind::Raster { path }),
+        "vector" | "svg" => Ok(ItemKind::Vector { path }),
+        "document" => Ok(ItemKind::Document { path }),
+        _ => bail!("Unknown item kind: {kind:?}"),
+    }
+}
diff --git a/src/render/converter.rs b/src/render/converter.rs
new file mode 100644
index 0000000..a4d02e6
--- /dev/null
+++ b/src/render/converter.rs
@@ -0,0 +1,4 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// src/render/converter.rs
+//
+// Converts raw document data into renderable page output.
diff --git a/src/render/mod.rs b/src/render/mod.rs
new file mode 100644
index 0000000..c13e7ba
--- /dev/null
+++ b/src/render/mod.rs
@@ -0,0 +1,7 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// src/render/mod.rs
+//
+// Rendering subsystem: converts document content into displayable output.
+
+pub mod converter;
+pub mod thumbnail;
diff --git a/src/render/thumbnail.rs b/src/render/thumbnail.rs
new file mode 100644
index 0000000..294a985
--- /dev/null
+++ b/src/render/thumbnail.rs
@@ -0,0 +1,4 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// src/render/thumbnail.rs
+//
+// Thumbnail cache following the freedesktop.org thumbnail spec.
diff --git a/src/ui/app.rs b/src/ui/app.rs
deleted file mode 100644
index 2093176..0000000
--- a/src/ui/app.rs
+++ /dev/null
@@ -1,403 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/ui/app/app.rs
-//
-// COSMIC application wiring and main app struct.
-
-use super::message::AppMessage;
-use super::model::{AppModel, ViewMode};
-use super::update;
-use crate::ui::views;
-
-use std::time::Duration;
-
-use cosmic::app::{context_drawer, Core};
-use cosmic::cosmic_config::{self, CosmicConfigEntry};
-use cosmic::iced::keyboard::{self, key::Named, Key, Modifiers};
-use cosmic::iced::time;
-use cosmic::iced::window;
-use cosmic::iced::Subscription;
-use cosmic::widget::nav_bar;
-use cosmic::{Action, Element, Task};
-
-use crate::application::DocumentManager;
-use crate::config::AppConfig;
-use crate::Args;
-
-/// Flags passed from `main` into the application.
-#[derive(Debug, Clone)]
-pub enum Flags {
-    Args(Args),
-}
-
-/// Context page displayed in right drawer.
-#[derive(Copy, Clone, Debug, Default, Eq, PartialEq)]
-pub enum ContextPage {
-    #[default]
-    Properties,
-}
-
-/// Main application type.
-pub struct NoctuaApp {
-    core: Core,
-    pub model: AppModel,
-    nav: nav_bar::Model,
-    context_page: ContextPage,
-    pub config: AppConfig,
-    config_handler: Option<cosmic_config::Config>,
-    pub document_manager: DocumentManager,
-}
-
-impl cosmic::Application for NoctuaApp {
-    type Executor = cosmic::SingleThreadExecutor;
-    type Flags = Flags;
-    type Message = AppMessage;
-
-    const APP_ID: &'static str = "org.codeberg.wfx.Noctua";
-
-    fn core(&self) -> &Core {
-        &self.core
-    }
-
-    fn core_mut(&mut self) -> &mut Core {
-        &mut self.core
-    }
-
-    fn init(mut core: Core, flags: Self::Flags) -> (Self, Task<Action<Self::Message>>) {
-        // Load persisted config.
-        let (config, config_handler) =
-            match cosmic_config::Config::new(Self::APP_ID, AppConfig::VERSION) {
-                Ok(handler) => {
-                    let config = AppConfig::get_entry(&handler).unwrap_or_default();
-                    (config, Some(handler))
-                }
-                Err(_) => (AppConfig::default(), None),
-            };
-
-        let Flags::Args(args) = flags;
-
-        // Determine initial path: CLI argument takes priority.
-        // Fall back to configured default directory only if it exists.
-        let initial_path = args.file.or_else(|| {
-            config
-                .default_image_dir
-                .as_ref()
-                .filter(|p| p.exists())
-                .cloned()
-        });
-
-        // Initialize document manager
-        let mut document_manager = DocumentManager::new();
-
-        // Initialize model
-        let mut model = AppModel::new(config.clone());
-
-        // Load initial document if provided
-        if let Some(path) = initial_path {
-            if let Err(e) = document_manager.open_document(&path) {
-                log::error!("Failed to open initial path {}: {}", path.display(), e);
-            } else {
-                // Set initial view mode to Fit
-                model.viewport.fit_mode = ViewMode::Fit;
-                model.viewport.scale = 1.0;
-                model.reset_pan();
-
-                // Cache initial render so image is displayed immediately
-                if let Some(doc) = document_manager.current_document_mut() {
-                    use crate::domain::document::core::document::Renderable;
-                    match doc.render(model.viewport.scale as f64) {
-                        Ok(output) => {
-                            model.viewport.cached_image_handle = Some(output.handle);
-                        }
-                        Err(e) => {
-                            log::error!("Failed to render initial document: {}", e);
-                        }
-                    }
-                }
-            }
-        }
-
-        // Initialize nav bar model (required for COSMIC to show toggle icon).
-        let nav = nav_bar::Model::default();
-
-        // Apply persisted panel states.
-        core.window.show_context = config.context_drawer_visible;
-
-        // Auto-open nav bar for multi-page documents
-        let should_show_nav = if let Some(doc) = document_manager.current_document() {
-            doc.is_multi_page()
-        } else {
-            false
-        };
-
-        if should_show_nav {
-            core.nav_bar_set_toggled(true);
-            model.panels.left = Some(crate::ui::model::LeftPanel::Thumbnails);
-        } else {
-            core.nav_bar_set_toggled(config.nav_bar_visible);
-        }
-
-        // Start thumbnail generation for initial document if applicable.
-        let init_task = start_thumbnail_generation(&model);
-
-        (
-            Self {
-                core,
-                model,
-                nav,
-                context_page: ContextPage::default(),
-                config,
-                config_handler,
-                document_manager,
-            },
-            init_task,
-        )
-    }
-
-    fn on_close_requested(&self, _id: window::Id) -> Option<Self::Message> {
-        None
-    }
-
-    fn update(&mut self, message: Self::Message) -> Task<Action<Self::Message>> {
-        match &message {
-            AppMessage::ToggleNavBar => {
-                use crate::ui::model::LeftPanel;
-
-                self.core.nav_bar_toggle();
-                let is_visible = self.core.nav_bar_active();
-                self.config.nav_bar_visible = is_visible;
-                self.save_config();
-
-                if is_visible {
-                    // Opening nav bar - show thumbnails for multi-page docs
-                    if let Some(doc) = self.document_manager.current_document()
-                        && doc.is_multi_page()
-                    {
-                        self.model.panels.left = Some(LeftPanel::Thumbnails);
-                    }
-                } else {
-                    // Closing nav bar - hide left panel
-                    self.model.panels.left = None;
-                }
-                return Task::none();
-            }
-
-            AppMessage::OpenFormatPanel => {
-                // Format panel is now part of Transform mode
-                // Switch to Transform mode which shows format tools in right panel
-                self.model.mode = crate::ui::model::AppMode::Transform {
-                    paper_format: None,
-                    orientation: crate::ui::model::Orientation::default(),
-                };
-
-                return Task::none();
-            }
-
-            AppMessage::ToggleContextPage(page) => {
-                if self.context_page == *page {
-                    self.core.window.show_context = !self.core.window.show_context;
-                } else {
-                    self.context_page = *page;
-                    self.core.window.show_context = true;
-                }
-                self.config.context_drawer_visible = self.core.window.show_context;
-                self.save_config();
-                return Task::none();
-            }
-
-            AppMessage::OpenPath(_) | AppMessage::NextDocument | AppMessage::PrevDocument => {
-                let result = update::update(self, &message);
-                let thumb_task = start_thumbnail_generation_task(&self.model);
-                return match result {
-                    update::UpdateResult::None => thumb_task,
-                    update::UpdateResult::Task(task) => Task::batch([task, thumb_task]),
-                };
-            }
-
-            _ => {}
-        }
-
-        match update::update(self, &message) {
-            update::UpdateResult::None => Task::none(),
-            update::UpdateResult::Task(task) => task,
-        }
-    }
-
-    fn header_start(&self) -> Vec<Element<'_, Self::Message>> {
-        views::header::start(&self.model, &self.document_manager)
-    }
-
-    fn header_end(&self) -> Vec<Element<'_, Self::Message>> {
-        views::header::end(&self.model, &self.document_manager)
-    }
-
-    fn view(&self) -> Element<'_, Self::Message> {
-        views::view(&self.model, &self.document_manager, &self.config)
-    }
-
-    fn context_drawer(&self) -> Option<context_drawer::ContextDrawer<'_, Self::Message>> {
-        if !self.core.window.show_context {
-            return None;
-        }
-        Some(context_drawer::context_drawer(
-            views::panels::view(&self.model, &self.document_manager),
-            AppMessage::ToggleContextPage(ContextPage::Properties),
-        ))
-    }
-
-    fn nav_model(&self) -> Option<&nav_bar::Model> {
-        Some(&self.nav)
-    }
-
-    fn nav_bar(&self) -> Option<Element<'_, Action<Self::Message>>> {
-        if !self.core.nav_bar_active() {
-            return None;
-        }
-        views::nav_bar(&self.model, &self.document_manager)
-    }
-
-    fn footer(&self) -> Option<Element<'_, Self::Message>> {
-        Some(views::footer::view(&self.model, &self.document_manager))
-    }
-
-    fn subscription(&self) -> Subscription<Self::Message> {
-        Subscription::batch([
-            keyboard::on_key_press(handle_key_press),
-            thumbnail_refresh_subscription(self),
-        ])
-    }
-}
-
-impl NoctuaApp {
-    /// Save current config to disk.
-    fn save_config(&self) {
-        if let Some(ref handler) = self.config_handler {
-            let _ = self.config.write_entry(handler);
-        }
-    }
-
-    /// Update nav bar visibility based on current document type.
-    pub fn update_nav_bar_for_document(&mut self) {
-        use crate::ui::model::LeftPanel;
-
-        if let Some(doc) = self.document_manager.current_document() {
-            if doc.is_multi_page() {
-                // Multi-page document: open nav bar and show thumbnails
-                self.core.nav_bar_set_toggled(true);
-                self.model.panels.left = Some(LeftPanel::Thumbnails);
-            } else {
-                // Single-page document: close nav bar
-                self.core.nav_bar_set_toggled(false);
-                self.model.panels.left = None;
-            }
-        }
-    }
-}
-
-/// Map raw key presses + modifiers into high-level application messages.
-fn handle_key_press(key: Key, modifiers: Modifiers) -> Option<AppMessage> {
-    use AppMessage::{
-        PanLeft, PanRight, PanUp, PanDown, OpenFormatPanel, NextDocument, PrevDocument,
-        FlipHorizontal, FlipVertical, RotateCCW, RotateCW, ZoomIn, ZoomOut, ZoomReset, ZoomFit,
-        ToggleCropMode, ToggleScaleMode, PanReset, ToggleContextPage, ToggleNavBar, SetAsWallpaper,
-    };
-
-    // Handle Ctrl + arrow keys for panning.
-    if modifiers.control() && !modifiers.shift() && !modifiers.alt() && !modifiers.logo() {
-        return match key.as_ref() {
-            Key::Named(Named::ArrowLeft) => Some(PanLeft),
-            Key::Named(Named::ArrowRight) => Some(PanRight),
-            Key::Named(Named::ArrowUp) => Some(PanUp),
-            Key::Named(Named::ArrowDown) => Some(PanDown),
-            Key::Character(ch) if ch.eq_ignore_ascii_case("f") => Some(OpenFormatPanel),
-            _ => None,
-        };
-    }
-
-    // Ignore key presses when command-style modifiers are pressed.
-    if modifiers.command() || modifiers.alt() || modifiers.logo() || modifiers.control() {
-        return None;
-    }
-
-    match key.as_ref() {
-        // Navigation with arrow keys (no modifiers).
-        Key::Named(Named::ArrowRight) => Some(NextDocument),
-        Key::Named(Named::ArrowLeft) => Some(PrevDocument),
-
-        // Transformations.
-        Key::Character(ch) if ch.eq_ignore_ascii_case("h") => Some(FlipHorizontal),
-        Key::Character(ch) if ch.eq_ignore_ascii_case("v") => Some(FlipVertical),
-        Key::Character(ch) if ch.eq_ignore_ascii_case("r") => {
-            if modifiers.shift() {
-                Some(RotateCCW)
-            } else {
-                Some(RotateCW)
-            }
-        }
-
-        // Zoom.
-        Key::Character("+" | "=") => Some(ZoomIn),
-        Key::Character("-") => Some(ZoomOut),
-        Key::Character("1") => Some(ZoomReset),
-        Key::Character(ch) if ch.eq_ignore_ascii_case("f") => Some(ZoomFit),
-
-        // Tool modes.
-        Key::Character(ch) if ch.eq_ignore_ascii_case("c") => Some(ToggleCropMode),
-        Key::Character(ch) if ch.eq_ignore_ascii_case("s") => Some(ToggleScaleMode),
-
-        // Crop mode actions (Enter/Escape handled via key press, validated in update).
-        Key::Named(Named::Enter) => Some(AppMessage::ApplyCrop),
-        Key::Named(Named::Escape) => Some(AppMessage::CancelCrop),
-
-        // Reset pan.
-        Key::Character("0") => Some(PanReset),
-
-        // Toggle panels.
-        Key::Character(ch) if ch.eq_ignore_ascii_case("i") => {
-            Some(ToggleContextPage(ContextPage::Properties))
-        }
-        Key::Character(ch) if ch.eq_ignore_ascii_case("n") => Some(ToggleNavBar),
-
-        // Wallpaper.
-        Key::Character(ch) if ch.eq_ignore_ascii_case("w") => Some(SetAsWallpaper),
-
-        _ => None,
-    }
-}
-
-// =============================================================================
-// Thumbnail Helpers
-// =============================================================================
-
-fn start_thumbnail_generation(model: &AppModel) -> Task<Action<AppMessage>> {
-    start_thumbnail_generation_task(model)
-}
-
-fn start_thumbnail_generation_task(_model: &AppModel) -> Task<Action<AppMessage>> {
-    // TODO: Re-enable when document is synced from DocumentManager
-    // if let Some(doc) = &model.document {
-    //     let page_count = doc.page_count();
-    //     if page_count > 0 && !doc.thumbnails_ready() {
-    //         return Task::batch([
-    //             Task::done(Action::App(AppMessage::GenerateThumbnailPage(0))),
-    //             Task::done(Action::App(AppMessage::RefreshView)),
-    //         ]);
-    //     }
-    // }
-    Task::none()
-}
-
-fn thumbnail_refresh_subscription(_app: &NoctuaApp) -> Subscription<AppMessage> {
-    // TODO: Re-enable when document is synced from DocumentManager
-    let needs_refresh = false;
-    // let needs_refresh = app
-    //     .model
-    //     .document
-    //     .as_ref()
-    //     .is_some_and(|doc| doc.is_multi_page() && !doc.thumbnails_ready());
-
-    if needs_refresh {
-        time::every(Duration::from_millis(100)).map(|_| AppMessage::RefreshView)
-    } else {
-        Subscription::none()
-    }
-}
diff --git a/src/ui/components/mod.rs b/src/ui/components/mod.rs
deleted file mode 100644
index debd9c5..0000000
--- a/src/ui/components/mod.rs
+++ /dev/null
@@ -1,6 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/ui/components/mod.rs
-//
-// UI components: reusable widgets and controls.
-
-// Crop functionality moved to ui/widgets
diff --git a/src/ui/message.rs b/src/ui/message.rs
deleted file mode 100644
index 18826e3..0000000
--- a/src/ui/message.rs
+++ /dev/null
@@ -1,102 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/app/message.rs
-//
-// Application messages: events, user actions, and internal signals.
-
-use std::path::PathBuf;
-
-use crate::ui::widgets::DragHandle;
-
-#[derive(Debug, Clone)]
-pub enum AppMessage {
-    // File / navigation.
-    #[allow(dead_code)]
-    OpenPath(PathBuf),
-    NextDocument,
-    PrevDocument,
-    GotoPage(usize),
-    GenerateThumbnailPage(usize),
-
-    // Transformations.
-    RotateCW,
-    RotateCCW,
-    FlipHorizontal,
-    FlipVertical,
-
-    // View / zoom.
-    ZoomIn,
-    ZoomOut,
-    ZoomReset,
-    ZoomFit,
-    ViewerStateChanged {
-        scale: f32,
-        offset_x: f32,
-        offset_y: f32,
-        canvas_size: cosmic::iced::Size,
-        image_size: cosmic::iced::Size,
-    },
-
-    // Pan control.
-    PanLeft,
-    PanRight,
-    PanUp,
-    PanDown,
-    PanReset,
-
-    // Tool modes.
-    ToggleCropMode,
-    ToggleScaleMode,
-
-    // Crop operations.
-    StartCrop,
-    CancelCrop,
-    ApplyCrop,
-    CropDragStart {
-        x: f32,
-        y: f32,
-        handle: DragHandle,
-    },
-    CropDragMove {
-        x: f32,
-        y: f32,
-        max_x: f32,
-        max_y: f32,
-    },
-
-    CropDragEnd,
-
-    // Panels.
-    ToggleContextPage(crate::ui::app::ContextPage),
-    ToggleNavBar,
-    OpenFormatPanel,
-
-    // Menu.
-    ToggleMainMenu,
-
-    // Format operations.
-    SetPaperFormat(super::model::PaperFormat),
-    SetOrientation(super::model::Orientation),
-
-    // Metadata.
-    #[allow(dead_code)]
-    RefreshMetadata,
-
-    // Save operations.
-    SaveAs,
-
-    // Wallpaper.
-    SetAsWallpaper,
-
-    // Errors.
-    #[allow(dead_code)]
-    ShowError(String),
-    #[allow(dead_code)]
-    ClearError,
-
-    // UI refresh.
-    RefreshView,
-
-    // Fallback.
-    #[allow(dead_code)]
-    NoOp,
-}
diff --git a/src/ui/mod.rs b/src/ui/mod.rs
deleted file mode 100644
index 96a0990..0000000
--- a/src/ui/mod.rs
+++ /dev/null
@@ -1,17 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/ui/mod.rs
-//
-// UI layer: COSMIC application, views, and widgets.
-
-pub mod app;
-pub mod message;
-pub mod model;
-pub mod update;
-pub mod components;
-pub mod views;
-pub mod widgets;
-
-// Re-export main types
-pub use app::NoctuaApp;
-pub use message::AppMessage;
-pub use model::AppModel;
diff --git a/src/ui/model.rs b/src/ui/model.rs
deleted file mode 100644
index ef22573..0000000
--- a/src/ui/model.rs
+++ /dev/null
@@ -1,280 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/ui/model.rs
-//
-// UI state (view, tools, panels).
-//
-// AppModel contains ONLY UI-specific state.
-// Document state lives in DocumentManager (application layer).
-
-use cosmic::iced::Size;
-
-use crate::ui::widgets::CropSelection;
-use crate::config::AppConfig;
-
-// =============================================================================
-// View Mode
-// =============================================================================
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
-pub enum ViewMode {
-    #[default]
-    Fit,
-    ActualSize,
-    Custom,
-}
-
-// =============================================================================
-// Paper Format (for export/transform)
-// =============================================================================
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub enum PaperFormat {
-    UsLetter,
-    IsoA0,
-    IsoA1,
-    IsoA2,
-    IsoA3,
-    IsoA4,
-    IsoA5,
-    IsoA6,
-}
-
-impl PaperFormat {
-    /// Returns (width, height) in millimeters
-    pub fn dimensions_mm(self) -> (u32, u32) {
-        match self {
-            Self::UsLetter => (216, 279), // 8.5 x 11 inches
-            Self::IsoA0 => (841, 1189),
-            Self::IsoA1 => (594, 841),
-            Self::IsoA2 => (420, 594),
-            Self::IsoA3 => (297, 420),
-            Self::IsoA4 => (210, 297),
-            Self::IsoA5 => (148, 210),
-            Self::IsoA6 => (105, 148),
-        }
-    }
-
-    /// Returns display name
-    pub fn display_name(self) -> &'static str {
-        match self {
-            Self::UsLetter => "US Letter",
-            Self::IsoA0 => "A0 (841 × 1189 mm)",
-            Self::IsoA1 => "A1",
-            Self::IsoA2 => "A2",
-            Self::IsoA3 => "A3",
-            Self::IsoA4 => "A4",
-            Self::IsoA5 => "A5 (148 × 210 mm)",
-            Self::IsoA6 => "A6",
-        }
-    }
-}
-
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
-pub enum Orientation {
-    Horizontal,
-    #[default]
-    Vertical,
-}
-
-// =============================================================================
-// Application Mode (combines tool + panel state)
-// =============================================================================
-
-/// Application mode - unified tool and panel state.
-///
-/// Each mode determines:
-/// - Active tool behavior
-/// - Right panel content
-/// - Available shortcuts
-#[derive(Debug, Clone)]
-#[allow(dead_code)]
-pub enum AppMode {
-    /// Normal viewing mode - no active tool
-    View,
-
-    /// Crop mode with selection
-    Crop { selection: CropSelection },
-
-    /// Transform/export mode
-    Transform {
-        paper_format: Option<PaperFormat>,
-        orientation: Orientation,
-    },
-
-    /// Fullscreen mode (all panels hidden)
-    Fullscreen,
-}
-
-impl Default for AppMode {
-    fn default() -> Self {
-        Self::View
-    }
-}
-
-impl AppMode {
-    /// Get the right panel that should be shown for this mode
-    pub fn right_panel(&self) -> Option<RightPanel> {
-        match self {
-            Self::View => Some(RightPanel::Properties),
-            Self::Crop { .. } => Some(RightPanel::CropTools),
-            Self::Transform { .. } => Some(RightPanel::TransformTools),
-            Self::Fullscreen => None,
-        }
-    }
-
-    /// Check if mode is an active tool (not View/Fullscreen)
-    pub fn is_tool_active(&self) -> bool {
-        matches!(self, Self::Crop { .. } | Self::Transform { .. })
-    }
-}
-
-// =============================================================================
-// Viewport (zoom, pan, canvas)
-// =============================================================================
-
-/// Viewport state - zoom, pan, canvas dimensions.
-#[derive(Debug, Clone)]
-pub struct Viewport {
-    /// Current scale factor
-    pub scale: f32,
-
-    /// Pan offset X
-    pub pan_x: f32,
-
-    /// Pan offset Y
-    pub pan_y: f32,
-
-    /// Canvas size (container)
-    pub canvas_size: Size,
-
-    /// Image size (after scaling)
-    pub image_size: Size,
-
-    /// Fit mode
-    pub fit_mode: ViewMode,
-
-    /// Scroll container ID
-    pub scroll_id: cosmic::widget::Id,
-
-    /// Cached image handle for rendering (updated when document or scale changes)
-    pub cached_image_handle: Option<cosmic::widget::image::Handle>,
-}
-
-impl Default for Viewport {
-    fn default() -> Self {
-        Self {
-            scale: 1.0,
-            pan_x: 0.0,
-            pan_y: 0.0,
-            canvas_size: Size::ZERO,
-            image_size: Size::ZERO,
-            fit_mode: ViewMode::Fit,
-            scroll_id: cosmic::widget::Id::new("canvas-scroll"),
-            cached_image_handle: None,
-        }
-    }
-}
-
-impl Viewport {
-    /// Reset pan to center
-    pub fn reset_pan(&mut self) {
-        self.pan_x = 0.0;
-        self.pan_y = 0.0;
-    }
-}
-
-// =============================================================================
-// Panel State
-// =============================================================================
-
-/// Panel visibility state.
-#[derive(Debug, Clone, Default)]
-pub struct PanelState {
-    /// Left panel (thumbnails for multi-page)
-    pub left: Option<LeftPanel>,
-
-    /// Right panel (context-dependent tools/properties)
-    pub right: Option<RightPanel>,
-}
-
-/// Left panel types
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub enum LeftPanel {
-    /// Thumbnail navigation for multi-page documents
-    Thumbnails,
-}
-
-/// Right panel types
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-#[allow(dead_code)]
-pub enum RightPanel {
-    /// Document properties and metadata
-    Properties,
-
-    /// Crop mode tools
-    CropTools,
-
-    /// Transform/export tools
-    TransformTools,
-}
-
-// =============================================================================
-// AppModel (UI State Only)
-// =============================================================================
-
-/// UI state for the application.
-///
-/// Contains ONLY UI-specific state:
-/// - Current mode (view/tool)
-/// - Viewport (zoom/pan)
-/// - Panel visibility
-/// - Transient UI state (errors, menu)
-///
-/// Document state (current file, metadata, etc.) lives in DocumentManager!
-pub struct AppModel {
-    /// Current application mode
-    pub mode: AppMode,
-
-    /// Viewport state
-    pub viewport: Viewport,
-
-    /// Panel visibility
-    pub panels: PanelState,
-
-    /// Error message to display
-    pub error: Option<String>,
-
-    /// Is main menu open?
-    pub menu_open: bool,
-
-    /// Tick counter for animations
-    pub tick: u64,
-}
-
-impl AppModel {
-    pub fn new(_config: AppConfig) -> Self {
-        Self {
-            mode: AppMode::default(),
-            viewport: Viewport::default(),
-            panels: PanelState::default(),
-            error: None,
-            menu_open: false,
-            tick: 0,
-        }
-    }
-
-    /// Set error message
-    pub fn set_error<S: Into<String>>(&mut self, msg: S) {
-        self.error = Some(msg.into());
-    }
-
-    /// Clear error message
-    pub fn clear_error(&mut self) {
-        self.error = None;
-    }
-
-    /// Reset viewport pan to center
-    pub fn reset_pan(&mut self) {
-        self.viewport.reset_pan();
-    }
-}
diff --git a/src/ui/update.rs b/src/ui/update.rs
deleted file mode 100644
index a511072..0000000
--- a/src/ui/update.rs
+++ /dev/null
@@ -1,404 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/ui/update.rs
-//
-// Application update loop: applies messages to the global model state.
-
-use cosmic::{Action, Task};
-
-use super::NoctuaApp;
-use super::message::AppMessage;
-use super::model::{AppMode, ViewMode};
-use crate::application::commands::transform_document::{TransformDocumentCommand, TransformOperation};
-use crate::application::commands::crop_document::CropDocumentCommand;
-use crate::domain::document::core::document::Renderable;
-use crate::ui::widgets::{CropSelection, DragHandle};
-
-// =============================================================================
-// Update Result
-// =============================================================================
-
-#[allow(dead_code)]
-pub enum UpdateResult {
-    None,
-    Task(Task<Action<AppMessage>>),
-}
-
-// =============================================================================
-// Main Update Function
-// =============================================================================
-
-pub fn update(app: &mut NoctuaApp, msg: &AppMessage) -> UpdateResult {
-    match msg {
-        // ---- File / navigation ----------------------------------------------------
-        AppMessage::OpenPath(path) => {
-            if let Err(e) = app.document_manager.open_document(path) {
-                app.model.set_error(format!("Failed to open document: {e}"));
-            } else {
-                app.model.reset_pan();
-                app.model.viewport.fit_mode = ViewMode::Fit;
-                app.model.viewport.scale = 1.0;
-                cache_render(&mut app.model, &mut app.document_manager);
-
-                // Auto-toggle nav bar for multi-page documents
-                app.update_nav_bar_for_document();
-            }
-        }
-
-        AppMessage::NextDocument => {
-            // Ignore navigation in Crop mode
-            if !matches!(app.model.mode, AppMode::Crop { .. })
-                && let Some(_path) = app.document_manager.next_document()
-            {
-                // Reset zoom when navigating to new document
-                app.model.viewport.scale = 1.0;
-                app.model.viewport.fit_mode = ViewMode::Fit;
-                app.model.reset_pan();
-                cache_render(&mut app.model, &mut app.document_manager);
-
-                // Auto-toggle nav bar for multi-page documents
-                app.update_nav_bar_for_document();
-            }
-        }
-
-        AppMessage::PrevDocument => {
-            // Ignore navigation in Crop mode
-            if !matches!(app.model.mode, AppMode::Crop { .. })
-                && let Some(_path) = app.document_manager.previous_document()
-            {
-                // Reset zoom when navigating to new document
-                app.model.viewport.scale = 1.0;
-                app.model.viewport.fit_mode = ViewMode::Fit;
-                app.model.reset_pan();
-                cache_render(&mut app.model, &mut app.document_manager);
-
-                // Auto-toggle nav bar for multi-page documents
-                app.update_nav_bar_for_document();
-            }
-        }
-
-        AppMessage::GotoPage(page) => {
-            if let Some(doc) = app.document_manager.current_document_mut() {
-                if let Err(e) = doc.go_to_page(*page) {
-                    log::error!("Failed to navigate to page {page}: {e}");
-                } else {
-                    cache_render(&mut app.model, &mut app.document_manager);
-                }
-            }
-        }
-
-        // ---- Thumbnail generation -------------------------------------------------
-        AppMessage::GenerateThumbnailPage(_page) => {
-            // TODO: Thumbnail generation via DocumentManager
-            // Currently handled by DocumentManager.open_document()
-        }
-
-        AppMessage::RefreshView => {
-            app.model.tick += 1;
-        }
-
-        // ---- View / zoom ---------------------------------------------------------
-        AppMessage::ZoomIn => {
-            app.model.viewport.scale = (app.model.viewport.scale * 1.2).min(10.0);
-            app.model.viewport.fit_mode = ViewMode::Custom;
-        }
-
-        AppMessage::ZoomOut => {
-            app.model.viewport.scale = (app.model.viewport.scale / 1.2).max(0.1);
-            app.model.viewport.fit_mode = ViewMode::Custom;
-        }
-
-        AppMessage::ZoomReset => {
-            app.model.viewport.scale = 1.0;
-            app.model.viewport.fit_mode = ViewMode::ActualSize;
-            app.model.reset_pan();
-        }
-
-        AppMessage::ZoomFit => {
-            app.model.viewport.fit_mode = ViewMode::Fit;
-            app.model.reset_pan();
-        }
-
-        AppMessage::ViewerStateChanged {
-            scale,
-            offset_x,
-            offset_y,
-            canvas_size,
-            image_size,
-        } => {
-            // Detect scale changes (zoom vs just pan)
-            let old_scale = app.model.viewport.scale;
-
-            // Update model from viewer state
-            app.model.viewport.scale = *scale;
-            app.model.viewport.pan_x = *offset_x;
-            app.model.viewport.pan_y = *offset_y;
-            app.model.viewport.canvas_size = *canvas_size;
-            app.model.viewport.image_size = *image_size;
-
-            // If scale changed, user zoomed -> switch to Custom mode and re-render
-            // (Fit mode is only maintained when explicitly set via ZoomFit button)
-            if (old_scale - *scale).abs() > 0.001 {
-                app.model.viewport.fit_mode = ViewMode::Custom;
-                cache_render(&mut app.model, &mut app.document_manager);
-            }
-        }
-
-        // ---- Pan control ---------------------------------------------------------
-        AppMessage::PanLeft => {
-            app.model.viewport.pan_x -= 50.0;
-        }
-        AppMessage::PanRight => {
-            app.model.viewport.pan_x += 50.0;
-        }
-        AppMessage::PanUp => {
-            app.model.viewport.pan_y -= 50.0;
-        }
-        AppMessage::PanDown => {
-            app.model.viewport.pan_y += 50.0;
-        }
-        AppMessage::PanReset => {
-            app.model.reset_pan();
-        }
-
-        // ---- Tool modes ----------------------------------------------------------
-        AppMessage::ToggleCropMode => {
-            app.model.mode = match &app.model.mode {
-                AppMode::Crop { .. } => AppMode::View,
-                _ => AppMode::Crop {
-                    selection: CropSelection::default(),
-                },
-            };
-        }
-
-        AppMessage::ToggleScaleMode => {
-            // Scale mode -> Transform mode
-            app.model.mode = match &app.model.mode {
-                AppMode::Transform { .. } => AppMode::View,
-                _ => AppMode::Transform {
-                    paper_format: None,
-                    orientation: Default::default(),
-                },
-            };
-        }
-
-        // ---- Crop operations -----------------------------------------------------
-        AppMessage::StartCrop => {
-            if app.document_manager.current_document().is_some() {
-                app.model.mode = AppMode::Crop {
-                    selection: CropSelection::default(),
-                };
-            }
-        }
-
-        AppMessage::CancelCrop => {
-            // Only cancel if actually in Crop mode
-            if matches!(app.model.mode, AppMode::Crop { .. }) {
-                app.model.mode = AppMode::View;
-            }
-        }
-
-        AppMessage::ApplyCrop => {
-            if let AppMode::Crop { selection } = &app.model.mode {
-                // Get crop selection region
-                if let Some(crop_region) = selection.to_crop_region() {
-                    // Create crop command from canvas selection
-                    let pan_offset = cosmic::iced::Vector::new(
-                        app.model.viewport.pan_x,
-                        app.model.viewport.pan_y,
-                    );
-
-                    match CropDocumentCommand::from_canvas_selection(
-                        &crop_region,
-                        app.model.viewport.canvas_size,
-                        app.model.viewport.image_size,
-                        app.model.viewport.scale,
-                        pan_offset,
-                    ) {
-                        Ok(cmd) => {
-                            // Execute crop command
-                            if let Err(e) = cmd.execute(&mut app.document_manager) {
-                                app.model.set_error(format!("Crop failed: {e}"));
-                            } else {
-                                // Success - exit crop mode
-                                app.model.mode = AppMode::View;
-                                // Reset view to fit the cropped image
-                                app.model.viewport.scale = 1.0;
-                                app.model.viewport.fit_mode = ViewMode::Fit;
-                                app.model.reset_pan();
-                                cache_render(&mut app.model, &mut app.document_manager);
-                            }
-                        }
-                        Err(e) => {
-                            app.model.set_error(format!("Invalid crop region: {e}"));
-                        }
-                    }
-                } else {
-                    app.model.set_error("No crop region selected".to_string());
-                }
-            }
-        }
-
-        AppMessage::CropDragStart { x, y, handle } => {
-            if let AppMode::Crop { selection } = &mut app.model.mode {
-                if *handle == DragHandle::None {
-                    selection.start_new_selection(*x, *y);
-                } else {
-                    selection.start_handle_drag(*handle, *x, *y);
-                }
-            }
-        }
-
-        AppMessage::CropDragMove { x, y, max_x, max_y } => {
-            if let AppMode::Crop { selection } = &mut app.model.mode {
-                selection.update_drag(*x, *y, *max_x, *max_y);
-            }
-        }
-
-        AppMessage::CropDragEnd => {
-            if let AppMode::Crop { selection } = &mut app.model.mode {
-                selection.end_drag();
-            }
-        }
-
-        // ---- Save operations -----------------------------------------------------
-        AppMessage::SaveAs => {
-            save_as(&mut app.model);
-        }
-
-        // ---- Document transformations --------------------------------------------
-        AppMessage::FlipHorizontal => {
-            // Ignore transformations in Crop mode (would invalidate selection)
-            if !matches!(app.model.mode, AppMode::Crop { .. }) {
-                let cmd = TransformDocumentCommand::new(TransformOperation::FlipHorizontal);
-                if let Err(e) = cmd.execute(&mut app.document_manager) {
-                    app.model.set_error(format!("Flip horizontal failed: {e}"));
-                } else {
-                    cache_render(&mut app.model, &mut app.document_manager);
-                }
-            }
-        }
-
-        AppMessage::FlipVertical => {
-            // Ignore transformations in Crop mode (would invalidate selection)
-            if !matches!(app.model.mode, AppMode::Crop { .. }) {
-                let cmd = TransformDocumentCommand::new(TransformOperation::FlipVertical);
-                if let Err(e) = cmd.execute(&mut app.document_manager) {
-                    app.model.set_error(format!("Flip vertical failed: {e}"));
-                } else {
-                    cache_render(&mut app.model, &mut app.document_manager);
-                }
-            }
-        }
-
-        AppMessage::RotateCW => {
-            // Ignore transformations in Crop mode (would invalidate selection)
-            if !matches!(app.model.mode, AppMode::Crop { .. }) {
-                let cmd = TransformDocumentCommand::new(TransformOperation::RotateCw);
-                if let Err(e) = cmd.execute(&mut app.document_manager) {
-                    app.model.set_error(format!("Rotate clockwise failed: {e}"));
-                } else {
-                    cache_render(&mut app.model, &mut app.document_manager);
-                }
-            }
-        }
-
-        AppMessage::RotateCCW => {
-            // Ignore transformations in Crop mode (would invalidate selection)
-            if !matches!(app.model.mode, AppMode::Crop { .. }) {
-                let cmd = TransformDocumentCommand::new(TransformOperation::RotateCcw);
-                if let Err(e) = cmd.execute(&mut app.document_manager) {
-                    app.model.set_error(format!("Rotate CCW failed: {e}"));
-                } else {
-                    cache_render(&mut app.model, &mut app.document_manager);
-                }
-            }
-        }
-
-        // ---- Metadata ------------------------------------------------------------
-        AppMessage::RefreshMetadata => {
-            // Metadata is managed by DocumentManager
-            // Nothing to do here - views access it directly
-        }
-
-        // ---- Format operations ---------------------------------------------------
-        AppMessage::SetPaperFormat(format) => {
-            if let AppMode::Transform { paper_format, .. } = &mut app.model.mode {
-                *paper_format = Some(*format);
-            }
-        }
-
-        AppMessage::SetOrientation(orientation) => {
-            if let AppMode::Transform {
-                orientation: ori, ..
-            } = &mut app.model.mode
-            {
-                *ori = *orientation;
-            }
-        }
-
-        // ---- Menu ----------------------------------------------------------------
-        AppMessage::ToggleMainMenu => {
-            app.model.menu_open = !app.model.menu_open;
-        }
-
-        // ---- Wallpaper -----------------------------------------------------------
-        AppMessage::SetAsWallpaper => {
-            if let Some(path) = app.document_manager.current_path() {
-                log::info!("Setting wallpaper to: {}", path.display());
-                crate::infrastructure::system::set_as_wallpaper(path);
-            } else {
-                app.model.set_error("No image loaded".to_string());
-            }
-        }
-
-        // ---- Error handling ------------------------------------------------------
-        AppMessage::ShowError(msg) => {
-            app.model.set_error(msg.clone());
-        }
-
-        AppMessage::ClearError => {
-            app.model.clear_error();
-        }
-
-        // ---- Handled elsewhere ---------------------------------------------------
-        AppMessage::ToggleContextPage(_)
-        | AppMessage::ToggleNavBar
-        | AppMessage::OpenFormatPanel => {
-            // These are handled in app.rs
-        }
-
-        AppMessage::NoOp => {}
-    }
-
-    UpdateResult::None
-}
-
-// =============================================================================
-// Helper Functions
-// =============================================================================
-
-/// Cache rendered image handle in viewport for view performance.
-fn cache_render(
-    model: &mut super::model::AppModel,
-    manager: &mut crate::application::DocumentManager,
-) {
-    if let Some(doc) = manager.current_document_mut() {
-        match doc.render(model.viewport.scale as f64) {
-            Ok(output) => {
-                model.viewport.cached_image_handle = Some(output.handle);
-            }
-            Err(e) => {
-                log::error!("Failed to cache render: {e}");
-                model.viewport.cached_image_handle = None;
-            }
-        }
-    } else {
-        model.viewport.cached_image_handle = None;
-    }
-}
-
-fn save_as(model: &mut super::model::AppModel) {
-    // TODO: Implement file dialog for save path
-    // For now, show error that this needs UI integration
-    model.set_error("Save As: File dialog not yet implemented".to_string());
-}
diff --git a/src/ui/views/canvas.rs b/src/ui/views/canvas.rs
deleted file mode 100644
index 68d4729..0000000
--- a/src/ui/views/canvas.rs
+++ /dev/null
@@ -1,79 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/ui/views/canvas.rs
-//
-// Render the center canvas area with the current document.
-
-use cosmic::iced::widget::image::FilterMethod;
-use cosmic::iced::{ContentFit, Length};
-use cosmic::iced_widget::stack;
-use cosmic::widget::{container, text};
-use cosmic::Element;
-
-use crate::ui::widgets::{crop_overlay, Viewer};
-use crate::ui::model::{AppMode, ViewMode};
-use crate::ui::{AppMessage, AppModel};
-use crate::application::DocumentManager;
-use crate::config::AppConfig;
-use crate::fl;
-
-/// Render the center canvas area with the current document.
-pub fn view<'a>(
-    model: &'a AppModel,
-    _manager: &'a DocumentManager,
-    config: &'a AppConfig,
-) -> Element<'a, AppMessage> {
-    // Use cached image handle from viewport
-    if let Some(handle) = &model.viewport.cached_image_handle {
-        // Determine content fit mode
-        let content_fit = match model.viewport.fit_mode {
-            ViewMode::Fit => ContentFit::Contain,
-            ViewMode::ActualSize | ViewMode::Custom => ContentFit::None,
-        };
-
-        // Check if we're in crop mode (to disable pan)
-        let disable_pan = matches!(model.mode, AppMode::Crop { .. });
-
-        // Create image viewer
-        let img_viewer = Viewer::new(handle.clone())
-            .with_state(
-                model.viewport.scale,
-                model.viewport.pan_x,
-                model.viewport.pan_y,
-            )
-            .on_state_change(|scale, offset_x, offset_y, canvas_size, image_size| {
-                AppMessage::ViewerStateChanged {
-                    scale,
-                    offset_x,
-                    offset_y,
-                    canvas_size,
-                    image_size,
-                }
-            })
-            .width(Length::Fill)
-            .height(Length::Fill)
-            .content_fit(content_fit)
-            .filter_method(FilterMethod::Linear)
-            .min_scale(config.min_scale)
-            .max_scale(config.max_scale)
-            .scale_step(config.scale_step - 1.0)
-            .disable_pan(disable_pan);
-
-        // Overlay crop UI when in crop mode
-        if let AppMode::Crop { selection } = &model.mode {
-            let overlay = crop_overlay(selection, config.crop_show_grid);
-            stack![img_viewer, overlay].into()
-        } else {
-            container(img_viewer)
-                .width(Length::Fill)
-                .height(Length::Fill)
-                .into()
-        }
-    } else {
-        // No document loaded
-        container(text(fl!("no-document")))
-            .width(Length::Fill)
-            .height(Length::Fill)
-            .center(Length::Fill)
-            .into()
-    }
-}
diff --git a/src/ui/views/footer.rs b/src/ui/views/footer.rs
deleted file mode 100644
index b9770ea..0000000
--- a/src/ui/views/footer.rs
+++ /dev/null
@@ -1,87 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/ui/views/footer.rs
-//
-// Footer bar with zoom controls and document info.
-
-use cosmic::iced::Alignment;
-use cosmic::widget::{button, icon, row, text};
-use cosmic::Element;
-
-use crate::ui::model::{AppModel, ViewMode};
-use crate::ui::AppMessage;
-use crate::application::DocumentManager;
-use crate::domain::document::core::document::Renderable;
-use crate::fl;
-
-/// Build the footer element with zoom controls and document info.
-pub fn view<'a>(model: &'a AppModel, manager: &'a DocumentManager) -> Element<'a, AppMessage> {
-    // Zoom level display
-    let zoom_text = if model.viewport.fit_mode == ViewMode::Fit {
-        fl!("status-zoom-fit")
-    } else {
-        let percent = (model.viewport.scale * 100.0).round() as i32;
-        fl!("status-zoom-percent", percent: percent)
-    };
-
-    // Document dimensions (from DocumentManager)
-    let doc_info = if let Some(doc) = manager.current_document() {
-        let info = doc.info();
-        fl!("status-doc-dimensions", width: info.width, height: info.height)
-    } else {
-        String::new()
-    };
-
-    // Navigation position (from DocumentManager)
-    let folder_count = manager.folder_entries().len();
-    let nav_info = if folder_count == 0 {
-        String::new()
-    } else {
-        let current = manager.current_index().map_or(0, |i| i + 1);
-        let total = folder_count;
-        fl!("status-nav-position", current: current, total: total)
-    };
-
-    row()
-        .spacing(8)
-        .align_y(Alignment::Center)
-        .padding([4, 12])
-        // Zoom out button
-        .push(
-            button::icon(icon::from_name("zoom-out-symbolic"))
-                .on_press(AppMessage::ZoomOut)
-                .padding(4),
-        )
-        // Zoom level text
-        .push(text(zoom_text))
-        // Zoom in button
-        .push(
-            button::icon(icon::from_name("zoom-in-symbolic"))
-                .on_press(AppMessage::ZoomIn)
-                .padding(4),
-        )
-        // Zoom reset button
-        .push(
-            button::icon(icon::from_name("zoom-original-symbolic"))
-                .on_press(AppMessage::ZoomReset)
-                .padding(4),
-        )
-        // Zoom fit button
-        .push(
-            button::icon(icon::from_name("zoom-fit-best-symbolic"))
-                .on_press(AppMessage::ZoomFit)
-                .padding(4),
-        )
-        // Document dimensions
-        .push_maybe(if !doc_info.is_empty() {
-            Some(text(doc_info))
-        } else {
-            None
-        })
-        // Navigation info
-        .push_maybe(if folder_count == 0 {
-            None
-        } else {
-            Some(text(nav_info))
-        })
-        .into()
-}
diff --git a/src/ui/views/format_panel.rs b/src/ui/views/format_panel.rs
deleted file mode 100644
index 7863204..0000000
--- a/src/ui/views/format_panel.rs
+++ /dev/null
@@ -1,137 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/app/view/format_panel.rs
-//
-// Format panel for paper format and orientation selection.
-
-use cosmic::widget::{column, radio, text};
-use cosmic::Element;
-
-use crate::ui::model::{AppMode, AppModel, Orientation, PaperFormat};
-use crate::ui::AppMessage;
-use crate::fl;
-
-/// Build the format panel view for the navigation bar.
-pub fn view(model: &AppModel) -> Element<'static, AppMessage> {
-    // Extract values from Transform mode
-    let (paper_format, orientation) = match &model.mode {
-        AppMode::Transform {
-            paper_format,
-            orientation,
-        } => (*paper_format, *orientation),
-        _ => (None, Orientation::default()),
-    };
-
-    let mut content = column::with_capacity(20).spacing(12).padding(16);
-
-    // --- Format Section ---
-    content = content
-        .push(text::heading(fl!("format-section-title")))
-        .push(text::caption(fl!("format-section-subtitle")));
-
-    // US Letter
-    content = content.push(
-        radio(
-            "US Letter (216 × 279 mm)",
-            PaperFormat::UsLetter,
-            paper_format,
-            AppMessage::SetPaperFormat,
-        )
-        .size(16),
-    );
-
-    // ISO A formats
-    content = content
-        .push(text::body("ISO A"))
-        .push(
-            radio(
-                PaperFormat::IsoA0.display_name(),
-                PaperFormat::IsoA0,
-                paper_format,
-                AppMessage::SetPaperFormat,
-            )
-            .size(16),
-        )
-        .push(
-            radio(
-                PaperFormat::IsoA1.display_name(),
-                PaperFormat::IsoA1,
-                paper_format,
-                AppMessage::SetPaperFormat,
-            )
-            .size(16),
-        )
-        .push(
-            radio(
-                PaperFormat::IsoA2.display_name(),
-                PaperFormat::IsoA2,
-                paper_format,
-                AppMessage::SetPaperFormat,
-            )
-            .size(16),
-        )
-        .push(
-            radio(
-                PaperFormat::IsoA3.display_name(),
-                PaperFormat::IsoA3,
-                paper_format,
-                AppMessage::SetPaperFormat,
-            )
-            .size(16),
-        )
-        .push(
-            radio(
-                PaperFormat::IsoA4.display_name(),
-                PaperFormat::IsoA4,
-                paper_format,
-                AppMessage::SetPaperFormat,
-            )
-            .size(16),
-        )
-        .push(
-            radio(
-                PaperFormat::IsoA5.display_name(),
-                PaperFormat::IsoA5,
-                paper_format,
-                AppMessage::SetPaperFormat,
-            )
-            .size(16),
-        )
-        .push(
-            radio(
-                PaperFormat::IsoA6.display_name(),
-                PaperFormat::IsoA6,
-                paper_format,
-                AppMessage::SetPaperFormat,
-            )
-            .size(16),
-        );
-
-    // --- Orientation Section ---
-    content = content
-        .push(cosmic::widget::vertical_space().height(16))
-        .push(text::heading(fl!("orientation-section-title")));
-
-    // Horizontal
-    content = content.push(
-        radio(
-            "Horizontal",
-            Orientation::Horizontal,
-            Some(orientation),
-            AppMessage::SetOrientation,
-        )
-        .size(16),
-    );
-
-    // Vertical
-    content = content.push(
-        radio(
-            "Vertical",
-            Orientation::Vertical,
-            Some(orientation),
-            AppMessage::SetOrientation,
-        )
-        .size(16),
-    );
-
-    content.into()
-}
diff --git a/src/ui/views/header.rs b/src/ui/views/header.rs
deleted file mode 100644
index 9f53cbe..0000000
--- a/src/ui/views/header.rs
+++ /dev/null
@@ -1,91 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/app/view/header.rs
-//
-// Header bar content (navigation, rotation, flip).
-
-use cosmic::iced::Length;
-use cosmic::widget::{button, horizontal_space, icon, row};
-use cosmic::Element;
-
-use crate::ui::message::AppMessage;
-use crate::ui::model::AppModel;
-use crate::ui::app::ContextPage;
-use crate::application::DocumentManager;
-use crate::fl;
-
-/// Build the start (left) side of the header bar.
-pub fn start<'a>(
-    _model: &'a AppModel,
-    manager: &'a DocumentManager,
-) -> Vec<Element<'a, AppMessage>> {
-    let has_doc = manager.current_document().is_some();
-
-    // Left section: Panel toggle + Menu + Navigation
-    let left_controls = row()
-        .spacing(4)
-        .push(
-            button::icon(icon::from_name("view-sidebar-start-symbolic"))
-                .on_press(AppMessage::ToggleNavBar),
-            //.tooltip(fl!("tooltip-nav-toggle")),
-        )
-        // .push(
-        //     button::icon(icon::from_name("open-menu-symbolic"))
-        //         .on_press(AppMessage::ToggleMainMenu),
-        //     //.tooltip(fl!("menu-main")),
-        // )
-        .push(
-            button::icon(icon::from_name("go-previous-symbolic"))
-                .on_press_maybe(has_doc.then_some(AppMessage::PrevDocument)),
-            //.tooltip(fl!("tooltip-nav-previous")),
-        )
-        .push(
-            button::icon(icon::from_name("go-next-symbolic"))
-                .on_press_maybe(has_doc.then_some(AppMessage::NextDocument)),
-            //.tooltip(fl!("tooltip-nav-next")),
-        );
-
-    // Center section: Transformations
-    let center_controls = row()
-        .spacing(4)
-        .push(
-            button::icon(icon::from_name("object-rotate-left-symbolic"))
-                .on_press_maybe(has_doc.then_some(AppMessage::RotateCCW)),
-            //.tooltip(fl!("tooltip-rotate-ccw")),
-        )
-        .push(
-            button::icon(icon::from_name("object-rotate-right-symbolic"))
-                .on_press_maybe(has_doc.then_some(AppMessage::RotateCW)),
-            //.tooltip(fl!("tooltip-rotate-cw")),
-        )
-        .push(horizontal_space().width(Length::Fixed(12.0)))
-        .push(
-            button::icon(icon::from_name("object-flip-horizontal-symbolic"))
-                .on_press_maybe(has_doc.then_some(AppMessage::FlipHorizontal)),
-            //.tooltip(fl!("tooltip-flip-horizontal")),
-        )
-        .push(
-            button::icon(icon::from_name("object-flip-vertical-symbolic"))
-                .on_press_maybe(has_doc.then_some(AppMessage::FlipVertical)),
-            //.tooltip(fl!("tooltip-flip-vertical")),
-        );
-
-    vec![
-        left_controls.into(),
-        center_controls.into(),
-        horizontal_space().width(Length::Fill).into(),
-    ]
-}
-
-/// Build the end (right) side of the header bar.
-pub fn end<'a>(
-    _model: &'a AppModel,
-    _manager: &'a DocumentManager,
-) -> Vec<Element<'a, AppMessage>> {
-    vec![
-        // Info panel toggle
-        button::icon(icon::from_name("dialog-information-symbolic"))
-            .on_press(AppMessage::ToggleContextPage(ContextPage::Properties))
-            //.tooltip(fl!("tooltip-info-panel"))
-            .into(),
-    ]
-}
diff --git a/src/ui/views/meta_panel.rs b/src/ui/views/meta_panel.rs
deleted file mode 100644
index 025d4fa..0000000
--- a/src/ui/views/meta_panel.rs
+++ /dev/null
@@ -1,180 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/ui/views/meta_panel.rs
-//
-// Metadata and properties panel for document information.
-
-use cosmic::iced::{Alignment, Length};
-use cosmic::widget::{button, column, divider, horizontal_space, icon, row, text};
-use cosmic::Element;
-
-use crate::application::DocumentManager;
-use crate::domain::document::core::document::Renderable;
-use crate::ui::{AppMessage, AppModel};
-use crate::fl;
-
-/// Build the metadata/properties panel view.
-pub fn view(_model: &AppModel, manager: &DocumentManager) -> Element<'static, AppMessage> {
-    let mut content = column::with_capacity(16).spacing(8).padding(12);
-
-    // Header with action icons
-    content = content.push(panel_header(manager));
-
-    // Display document metadata if available
-    if let Some(meta) = manager.current_metadata() {
-        // --- Basic Information Section ---
-        content = content
-            .push(section_header(fl!("meta-section-file")))
-            .push(meta_row(fl!("meta-filename"), meta.basic.file_name.clone()))
-            .push(meta_row(fl!("meta-format"), meta.basic.format.clone()));
-
-        // Show dimensions - original from metadata, current if transformed
-        let original_dims = (meta.basic.width, meta.basic.height);
-        let current_dims = if let Some(doc) = manager.current_document() {
-            let info = doc.info();
-            (info.width, info.height)
-        } else {
-            (0, 0)
-        };
-
-        if original_dims != current_dims && current_dims != (0, 0) {
-            // Dimensions changed (e.g., rotation) - show both
-            content = content.push(meta_row(
-                fl!("meta-dimensions"),
-                format!(
-                    "{} × {} (original: {} × {})",
-                    current_dims.0, current_dims.1, original_dims.0, original_dims.1
-                ),
-            ));
-        } else {
-            // No transformation or no document loaded yet
-            content = content.push(meta_row(
-                fl!("meta-dimensions"),
-                meta.basic.resolution_display(),
-            ));
-        }
-
-        content = content
-            .push(meta_row(
-                fl!("meta-filesize"),
-                meta.basic.file_size_display(),
-            ))
-            .push(meta_row(
-                fl!("meta-colortype"),
-                meta.basic.color_type.clone(),
-            ));
-
-        // --- EXIF Section (if available) ---
-        if let Some(ref exif) = meta.exif {
-            let has_exif_data = exif.camera_display().is_some()
-                || exif.date_time.is_some()
-                || exif.exposure_time.is_some()
-                || exif.f_number.is_some()
-                || exif.iso.is_some()
-                || exif.focal_length.is_some()
-                || exif.gps_display().is_some();
-
-            if has_exif_data {
-                content = content
-                    .push(divider::horizontal::light())
-                    .push(section_header(fl!("meta-section-exif")));
-
-                if let Some(camera) = exif.camera_display() {
-                    content = content.push(meta_row(fl!("meta-camera"), camera));
-                }
-
-                if let Some(ref date) = exif.date_time {
-                    content = content.push(meta_row(fl!("meta-datetime"), date.clone()));
-                }
-
-                if let Some(ref exposure) = exif.exposure_time {
-                    content = content.push(meta_row(fl!("meta-exposure"), exposure.clone()));
-                }
-
-                if let Some(ref fnumber) = exif.f_number {
-                    content = content.push(meta_row(fl!("meta-aperture"), fnumber.clone()));
-                }
-
-                if let Some(iso) = exif.iso {
-                    content = content.push(meta_row(fl!("meta-iso"), format!("ISO {}", iso)));
-                }
-
-                if let Some(ref focal) = exif.focal_length {
-                    content = content.push(meta_row(fl!("meta-focal"), focal.clone()));
-                }
-
-                if let Some(gps) = exif.gps_display() {
-                    content = content.push(meta_row(fl!("meta-gps"), gps));
-                }
-            }
-        }
-
-        // --- File Path (at the bottom, less prominent) ---
-        content = content
-            .push(divider::horizontal::light())
-            .push(meta_row_small(
-                fl!("meta-path"),
-                meta.basic.file_path.clone(),
-            ));
-    } else {
-        // No document loaded
-        content = content
-            .push(vertical_space())
-            .push(text::body(fl!("no-document")))
-            .push(vertical_space());
-    }
-
-    content.into()
-}
-
-// =============================================================================
-// Helper Components
-// =============================================================================
-
-/// Panel header with title and action buttons.
-fn panel_header(manager: &DocumentManager) -> Element<'static, AppMessage> {
-    let has_doc = manager.current_document().is_some();
-
-    row::with_capacity(5)
-        .spacing(4)
-        .align_y(Alignment::Center)
-        .padding([0, 0, 8, 0])
-        .push(text::title4(fl!("panel-properties")))
-        .push(horizontal_space().width(Length::Fill))
-        .push(
-            button::icon(icon::from_name("image-x-generic-symbolic"))
-                .tooltip(fl!("action-set-wallpaper"))
-                .padding(4)
-                .on_press_maybe(has_doc.then_some(AppMessage::SetAsWallpaper)),
-        )
-        .into()
-}
-
-/// Section header for grouping metadata.
-fn section_header(label: String) -> Element<'static, AppMessage> {
-    text::heading(label).size(14).into()
-}
-
-/// Key-value metadata row.
-fn meta_row(label: String, value: String) -> Element<'static, AppMessage> {
-    column::with_capacity(2)
-        .spacing(2)
-        .push(text::caption(format!("{}:", label)))
-        .push(text::body(value))
-        .into()
-}
-
-/// Less prominent metadata row (smaller text).
-fn meta_row_small(label: String, value: String) -> Element<'static, AppMessage> {
-    column::with_capacity(2)
-        .spacing(2)
-        .push(text::caption(format!("{}:", label)))
-        .push(text::caption(value))
-        .into()
-}
-
-/// Vertical spacer helper.
-fn vertical_space() -> Element<'static, AppMessage> {
-    cosmic::widget::vertical_space()
-        .height(Length::Fixed(32.0))
-        .into()
-}
diff --git a/src/ui/views/mod.rs b/src/ui/views/mod.rs
deleted file mode 100644
index 439ae5d..0000000
--- a/src/ui/views/mod.rs
+++ /dev/null
@@ -1,51 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/app/view/mod.rs
-//
-// View module exports.
-
-pub mod canvas;
-pub mod footer;
-pub mod format_panel;
-pub mod header;
-pub mod meta_panel;
-pub mod pages_panel;
-pub mod panels;
-
-use cosmic::iced::Length;
-use cosmic::widget::container;
-use cosmic::{Action, Element};
-
-use crate::ui::model::LeftPanel;
-use crate::ui::{AppMessage, AppModel};
-use crate::application::DocumentManager;
-use crate::config::AppConfig;
-
-/// Main application view (canvas area).
-pub fn view<'a>(
-    model: &'a AppModel,
-    manager: &'a DocumentManager,
-    config: &'a AppConfig,
-) -> Element<'a, AppMessage> {
-    canvas::view(model, manager, config)
-}
-
-/// Navigation bar content (left panel).
-///
-/// Shows different panels based on panel state:
-/// - `LeftPanel::Thumbnails`: Page thumbnails (multi-page documents)
-/// - `None`: Hidden
-pub fn nav_bar<'a>(
-    model: &'a AppModel,
-    manager: &'a DocumentManager,
-) -> Option<Element<'a, Action<AppMessage>>> {
-    match model.panels.left {
-        None => None,
-        Some(LeftPanel::Thumbnails) => pages_panel::view(model, manager).map(|panel| {
-            container(panel.map(Action::App))
-                .width(Length::Shrink)
-                .height(Length::Fill)
-                .max_width(250)
-                .into()
-        }),
-    }
-}
diff --git a/src/ui/views/pages_panel.rs b/src/ui/views/pages_panel.rs
deleted file mode 100644
index c2ab024..0000000
--- a/src/ui/views/pages_panel.rs
+++ /dev/null
@@ -1,103 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/app/view/pages_panel.rs
-//
-// Page navigation panel for multi-page documents (PDF, multi-page TIFF, etc.).
-
-/// Maximum width in pixels for page navigation thumbnails.
-const THUMBNAIL_MAX_WIDTH: f32 = 100.0;
-
-use cosmic::iced::{Alignment, Length};
-use cosmic::widget::{button, column, container, scrollable, text};
-use cosmic::widget::image as cosmic_image;
-
-use cosmic::Element;
-
-use crate::application::DocumentManager;
-use crate::ui::{AppMessage, AppModel};
-use crate::fl;
-
-/// Build the page navigation panel view.
-/// Returns None if the current document doesn't support multiple pages.
-pub fn view<'a>(
-    _model: &'a AppModel,
-    manager: &'a DocumentManager,
-) -> Option<Element<'a, AppMessage>> {
-    // Get document and check if it's multi-page
-    let doc = manager.current_document()?;
-    let page_count = doc.page_count();
-
-    if page_count <= 1 {
-        return None;
-    }
-
-    let current_page = doc.current_page();
-    let loaded = doc.thumbnails_loaded();
-
-    let mut content = column::with_capacity(page_count + 1)
-        .spacing(12)
-        .padding([12, 8])
-        .align_x(Alignment::Center)
-        .width(Length::Fill);
-
-    // Show loading progress if not all thumbnails are ready.
-    if !doc.thumbnails_ready() {
-        let loading_msg = fl!("loading-thumbnails", current: loaded, total: page_count);
-        content = content.push(text::caption(loading_msg));
-    }
-
-    // Build thumbnail list for pages that are already loaded.
-    for page_index in 0..loaded {
-        let is_current = page_index == current_page;
-
-        // Get cached thumbnail handle (read-only access).
-        let thumbnail_element: Element<'static, AppMessage> =
-            if let Some(handle) = manager.get_thumbnail_handle(page_index) {
-                // Display the thumbnail image.
-                cosmic_image::Image::new(handle)
-                    .width(Length::Fixed(THUMBNAIL_MAX_WIDTH))
-                    .into()
-            } else {
-                // Fallback: show page number if thumbnail not yet loaded.
-                container(text(format!("Page {}", page_index + 1)))
-                    .width(Length::Fixed(THUMBNAIL_MAX_WIDTH))
-                    .height(Length::Fixed(THUMBNAIL_MAX_WIDTH * 1.4))
-                    .center_x(Length::Fill)
-                    .center_y(Length::Fill)
-                    .into()
-            };
-
-        // Page number label.
-        let page_label = text::caption(format!("{}", page_index + 1));
-
-        // Combine thumbnail and label in a column.
-        let page_content = column::with_capacity(2)
-            .spacing(4)
-            .align_x(Alignment::Center)
-            .push(thumbnail_element)
-            .push(page_label);
-
-        // Wrap in button for navigation.
-        let page_button = if is_current {
-            // Current page: highlighted style.
-            button::custom(page_content)
-                .class(cosmic::theme::Button::Suggested)
-                .padding(4)
-        } else {
-            // Other pages: clickable with standard style.
-            button::custom(page_content)
-                .class(cosmic::theme::Button::Standard)
-                .padding(4)
-                .on_press(AppMessage::GotoPage(page_index))
-        };
-
-        content = content.push(page_button);
-    }
-
-    // Wrap in scrollable container.
-    Some(
-        scrollable(content)
-            .width(Length::Shrink)
-            .height(Length::Fill)
-            .into(),
-    )
-}
diff --git a/src/ui/views/panels.rs b/src/ui/views/panels.rs
deleted file mode 100644
index 5879d8e..0000000
--- a/src/ui/views/panels.rs
+++ /dev/null
@@ -1,43 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/ui/views/panels.rs
-//
-// Panel router - delegates to specific panel views.
-
-use cosmic::Element;
-
-use crate::application::DocumentManager;
-use crate::ui::model::{AppModel, RightPanel};
-use crate::ui::AppMessage;
-
-use super::{format_panel, meta_panel};
-
-/// Build the right panel view based on current panel state.
-///
-/// Returns the appropriate panel content:
-/// - `RightPanel::Properties`: Metadata and document properties (default)
-/// - `RightPanel::CropTools`: Crop tool controls (TODO)
-/// - `RightPanel::TransformTools`: Transform/export controls
-///
-/// Defaults to Properties panel if no panel is explicitly set.
-pub fn view(model: &AppModel, manager: &DocumentManager) -> Element<'static, AppMessage> {
-    match model.panels.right.as_ref() {
-        Some(RightPanel::Properties) | None => meta_panel::view(model, manager),
-        Some(RightPanel::CropTools) => crop_tools_panel(model, manager),
-        Some(RightPanel::TransformTools) => format_panel::view(model),
-    }
-}
-
-/// Crop tools panel (TODO: implement dedicated crop controls).
-fn crop_tools_panel(_model: &AppModel, _manager: &DocumentManager) -> Element<'static, AppMessage> {
-    use cosmic::widget::{column, text};
-
-    column::with_capacity(4)
-        .spacing(12)
-        .padding(12)
-        .push(text::title4("Crop Tools"))
-        .push(text::body("Crop controls will be implemented here."))
-        .push(text::caption(
-            "For now, use the crop overlay on the canvas.",
-        ))
-        .into()
-}
diff --git a/src/ui/widgets/crop_model.rs b/src/ui/widgets/crop_model.rs
deleted file mode 100644
index 465e471..0000000
--- a/src/ui/widgets/crop_model.rs
+++ /dev/null
@@ -1,210 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/ui/widgets/crop_model.rs
-//
-// Crop UI model (drag state and logic).
-
-use crate::domain::document::operations::CropRegion;
-
-/// Drag handle for crop selection.
-/// 
-/// Identifies which part of the selection is being dragged.
-/// Pure UI concern - not part of domain.
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
-pub enum DragHandle {
-    #[default]
-    None,
-    TopLeft,
-    TopRight,
-    BottomLeft,
-    BottomRight,
-    Top,
-    Bottom,
-    Left,
-    Right,
-    Move,
-}
-
-/// Crop selection UI model.
-/// 
-/// Manages the interactive state of crop selection:
-/// - Current selection region (in screen/canvas coordinates)
-/// - Drag state (what's being dragged, where it started)
-/// - Drag logic (how to update region based on handle type)
-/// 
-/// This is UI-specific logic, not domain logic!
-#[derive(Debug, Clone, Default)]
-pub struct CropSelection {
-    /// Current selection region as (x, y, width, height) in screen coordinates
-    pub region: Option<(f32, f32, f32, f32)>,
-    
-    /// Is user currently dragging?
-    pub is_dragging: bool,
-    
-    /// Which handle/part is being dragged?
-    pub drag_handle: DragHandle,
-    
-    /// Where did the drag start? (for delta calculation)
-    drag_start: Option<(f32, f32)>,
-    
-    /// What was the region when drag started? (for resize calculation)
-    drag_start_region: Option<(f32, f32, f32, f32)>,
-}
-
-impl CropSelection {
-    pub fn new() -> Self {
-        Self::default()
-    }
-
-    /// Start a new selection (user clicks on empty area).
-    pub fn start_new_selection(&mut self, x: f32, y: f32) {
-        self.region = Some((x, y, 0.0, 0.0));
-        self.is_dragging = true;
-        self.drag_handle = DragHandle::None;
-        self.drag_start = Some((x, y));
-        self.drag_start_region = None;
-    }
-
-    /// Start dragging a handle (user clicks on existing selection).
-    pub fn start_handle_drag(&mut self, handle: DragHandle, x: f32, y: f32) {
-        self.is_dragging = true;
-        self.drag_handle = handle;
-        self.drag_start = Some((x, y));
-        self.drag_start_region = self.region;
-    }
-
-    /// Update selection during drag.
-    pub fn update_drag(&mut self, x: f32, y: f32, img_width: f32, img_height: f32) {
-        if !self.is_dragging {
-            return;
-        }
-
-        match self.drag_handle {
-            DragHandle::None => {
-                // Creating new selection - expand from start point
-                if let Some((start_x, start_y)) = self.drag_start {
-                    let min_x = start_x.min(x).max(0.0);
-                    let min_y = start_y.min(y).max(0.0);
-                    let max_x = start_x.max(x).min(img_width);
-                    let max_y = start_y.max(y).min(img_height);
-
-                    self.region = Some((min_x, min_y, max_x - min_x, max_y - min_y));
-                }
-            }
-            DragHandle::Move => {
-                // Moving entire selection
-                if let (Some((start_x, start_y)), Some((rx, ry, rw, rh))) =
-                    (self.drag_start, self.drag_start_region)
-                {
-                    let dx = x - start_x;
-                    let dy = y - start_y;
-                    let new_x = (rx + dx).max(0.0).min(img_width - rw);
-                    let new_y = (ry + dy).max(0.0).min(img_height - rh);
-                    self.region = Some((new_x, new_y, rw, rh));
-                }
-            }
-            _ => {
-                // Resizing from edge/corner
-                if let Some((rx, ry, rw, rh)) = self.drag_start_region {
-                    let (new_x, new_y, new_w, new_h) =
-                        self.resize_region(rx, ry, rw, rh, x, y, img_width, img_height);
-                    self.region = Some((new_x, new_y, new_w, new_h));
-                }
-            }
-        }
-    }
-
-    /// Resize region based on which handle is being dragged.
-    fn resize_region(
-        &self,
-        rx: f32,
-        ry: f32,
-        rw: f32,
-        rh: f32,
-        x: f32,
-        y: f32,
-        img_width: f32,
-        img_height: f32,
-    ) -> (f32, f32, f32, f32) {
-        const MIN_SIZE: f32 = 10.0;
-
-        let right = rx + rw;
-        let bottom = ry + rh;
-        let x = x.max(0.0).min(img_width);
-        let y = y.max(0.0).min(img_height);
-
-        match self.drag_handle {
-            DragHandle::TopLeft => {
-                let new_x = x.min(right - MIN_SIZE);
-                let new_y = y.min(bottom - MIN_SIZE);
-                (new_x, new_y, right - new_x, bottom - new_y)
-            }
-            DragHandle::TopRight => {
-                let new_right = x.max(rx + MIN_SIZE);
-                let new_y = y.min(bottom - MIN_SIZE);
-                (rx, new_y, new_right - rx, bottom - new_y)
-            }
-            DragHandle::BottomLeft => {
-                let new_x = x.min(right - MIN_SIZE);
-                let new_bottom = y.max(ry + MIN_SIZE);
-                (new_x, ry, right - new_x, new_bottom - ry)
-            }
-            DragHandle::BottomRight => {
-                let new_right = x.max(rx + MIN_SIZE);
-                let new_bottom = y.max(ry + MIN_SIZE);
-                (rx, ry, new_right - rx, new_bottom - ry)
-            }
-            DragHandle::Top => {
-                let new_y = y.min(bottom - MIN_SIZE);
-                (rx, new_y, rw, bottom - new_y)
-            }
-            DragHandle::Bottom => {
-                let new_bottom = y.max(ry + MIN_SIZE);
-                (rx, ry, rw, new_bottom - ry)
-            }
-            DragHandle::Left => {
-                let new_x = x.min(right - MIN_SIZE);
-                (new_x, ry, right - new_x, rh)
-            }
-            DragHandle::Right => {
-                let new_right = x.max(rx + MIN_SIZE);
-                (rx, ry, new_right - rx, rh)
-            }
-            _ => (rx, ry, rw, rh),
-        }
-    }
-
-    /// End drag operation.
-    pub fn end_drag(&mut self) {
-        self.is_dragging = false;
-        self.drag_start = None;
-        self.drag_start_region = None;
-    }
-
-    /// Reset selection (cancel).
-    pub fn reset(&mut self) {
-        *self = Self::default();
-    }
-
-    /// Check if there's a valid selection.
-    pub fn has_selection(&self) -> bool {
-        self.region
-            .map(|(_, _, w, h)| w > 1.0 && h > 1.0)
-            .unwrap_or(false)
-    }
-
-    /// Convert to domain CropRegion for actual crop operation.
-    pub fn to_crop_region(&self) -> Option<CropRegion> {
-        self.region.and_then(|(x, y, w, h)| {
-            if w > 1.0 && h > 1.0 {
-                Some(CropRegion {
-                    x: x as u32,
-                    y: y as u32,
-                    width: w as u32,
-                    height: h as u32,
-                })
-            } else {
-                None
-            }
-        })
-    }
-}
diff --git a/src/ui/widgets/crop_overlay.rs b/src/ui/widgets/crop_overlay.rs
deleted file mode 100644
index 457d2ca..0000000
--- a/src/ui/widgets/crop_overlay.rs
+++ /dev/null
@@ -1,404 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/ui/widgets/crop_overlay.rs
-//
-// Simple crop overlay.
-
-use cosmic::{
-    Element, Renderer,
-    iced::{
-        Color, Length, Point, Rectangle, Size,
-        advanced::{
-            Clipboard, Layout, Shell, Widget,
-            layout::{Limits, Node},
-            renderer::{Quad, Renderer as QuadRenderer},
-            widget::Tree,
-        },
-        event::{Event, Status},
-        mouse::{self, Button, Cursor},
-    },
-};
-
-use crate::ui::widgets::crop_model::{CropSelection, DragHandle};
-use crate::ui::AppMessage;
-
-const HANDLE_SIZE: f32 = 12.0;
-const HANDLE_HIT_SIZE: f32 = 24.0;
-const OVERLAY_COLOR: Color = Color::from_rgba(0.0, 0.0, 0.0, 0.5);
-const HANDLE_COLOR: Color = Color::WHITE;
-const BORDER_COLOR: Color = Color::WHITE;
-const BORDER_WIDTH: f32 = 2.0;
-
-pub struct CropOverlay {
-    selection: CropSelection,
-    show_grid: bool,
-    last_click: Option<std::time::Instant>,
-}
-
-impl CropOverlay {
-    pub fn new(selection: &CropSelection, show_grid: bool) -> Self {
-        Self {
-            selection: selection.clone(),
-            show_grid,
-            last_click: None,
-        }
-    }
-
-    fn hit_test_handle(&self, point: Point) -> DragHandle {
-        let Some((x, y, w, h)) = self.selection.region else {
-            return DragHandle::None;
-        };
-
-        let handles = [
-            (Point::new(x, y), DragHandle::TopLeft),
-            (Point::new(x + w, y), DragHandle::TopRight),
-            (Point::new(x, y + h), DragHandle::BottomLeft),
-            (Point::new(x + w, y + h), DragHandle::BottomRight),
-            (Point::new(x + w / 2.0, y), DragHandle::Top),
-            (Point::new(x + w / 2.0, y + h), DragHandle::Bottom),
-            (Point::new(x, y + h / 2.0), DragHandle::Left),
-            (Point::new(x + w, y + h / 2.0), DragHandle::Right),
-        ];
-
-        for (pos, handle) in handles {
-            if point_in_handle(point, pos) {
-                return handle;
-            }
-        }
-
-        if point.x >= x && point.x <= x + w && point.y >= y && point.y <= y + h {
-            return DragHandle::Move;
-        }
-
-        DragHandle::None
-    }
-
-    fn draw_overlay(&self, renderer: &mut Renderer, bounds: Rectangle) {
-        let Some((x, y, w, h)) = self.selection.region else {
-            draw_quad(renderer, bounds, OVERLAY_COLOR);
-            return;
-        };
-
-        // Convert relative coords to absolute screen coords
-        let abs_x = bounds.x + x;
-        let abs_y = bounds.y + y;
-        let abs_right = abs_x + w;
-        let abs_bottom = abs_y + h;
-
-        // Top
-        if abs_y > bounds.y {
-            draw_quad(
-                renderer,
-                Rectangle::new(
-                    Point::new(bounds.x, bounds.y),
-                    Size::new(bounds.width, abs_y - bounds.y),
-                ),
-                OVERLAY_COLOR,
-            );
-        }
-
-        // Bottom
-        if abs_bottom < bounds.y + bounds.height {
-            draw_quad(
-                renderer,
-                Rectangle::new(
-                    Point::new(bounds.x, abs_bottom),
-                    Size::new(bounds.width, bounds.y + bounds.height - abs_bottom),
-                ),
-                OVERLAY_COLOR,
-            );
-        }
-
-        // Left
-        if abs_x > bounds.x {
-            draw_quad(
-                renderer,
-                Rectangle::new(
-                    Point::new(bounds.x, abs_y),
-                    Size::new(abs_x - bounds.x, h),
-                ),
-                OVERLAY_COLOR,
-            );
-        }
-
-        // Right
-        if abs_right < bounds.x + bounds.width {
-            draw_quad(
-                renderer,
-                Rectangle::new(
-                    Point::new(abs_right, abs_y),
-                    Size::new(bounds.x + bounds.width - abs_right, h),
-                ),
-                OVERLAY_COLOR,
-            );
-        }
-    }
-
-    fn draw_border(&self, renderer: &mut Renderer, bounds: Rectangle) {
-        let Some((x, y, w, h)) = self.selection.region else {
-            return;
-        };
-
-        // Add bounds offset
-        let abs_x = bounds.x + x;
-        let abs_y = bounds.y + y;
-
-        // Top
-        draw_quad(
-            renderer,
-            Rectangle::new(Point::new(abs_x, abs_y), Size::new(w, BORDER_WIDTH)),
-            BORDER_COLOR,
-        );
-
-        // Bottom
-        draw_quad(
-            renderer,
-            Rectangle::new(
-                Point::new(abs_x, abs_y + h - BORDER_WIDTH),
-                Size::new(w, BORDER_WIDTH),
-            ),
-            BORDER_COLOR,
-        );
-
-        // Left
-        draw_quad(
-            renderer,
-            Rectangle::new(Point::new(abs_x, abs_y), Size::new(BORDER_WIDTH, h)),
-            BORDER_COLOR,
-        );
-
-        // Right
-        draw_quad(
-            renderer,
-            Rectangle::new(
-                Point::new(abs_x + w - BORDER_WIDTH, abs_y),
-                Size::new(BORDER_WIDTH, h),
-            ),
-            BORDER_COLOR,
-        );
-    }
-
-    fn draw_handles(&self, renderer: &mut Renderer, bounds: Rectangle) {
-        let Some((x, y, w, h)) = self.selection.region else {
-            return;
-        };
-
-        let half = HANDLE_SIZE / 2.0;
-
-        // Add bounds offset
-        let abs_x = bounds.x + x;
-        let abs_y = bounds.y + y;
-
-        let handles = [
-            Point::new(abs_x, abs_y),
-            Point::new(abs_x + w, abs_y),
-            Point::new(abs_x, abs_y + h),
-            Point::new(abs_x + w, abs_y + h),
-            Point::new(abs_x + w / 2.0, abs_y),
-            Point::new(abs_x + w / 2.0, abs_y + h),
-            Point::new(abs_x, abs_y + h / 2.0),
-            Point::new(abs_x + w, abs_y + h / 2.0),
-        ];
-
-        for pos in handles {
-            draw_quad(
-                renderer,
-                Rectangle::new(
-                    Point::new(pos.x - half, pos.y - half),
-                    Size::new(HANDLE_SIZE, HANDLE_SIZE),
-                ),
-                HANDLE_COLOR,
-            );
-        }
-    }
-
-    fn draw_grid(&self, renderer: &mut Renderer, bounds: Rectangle) {
-        if !self.show_grid {
-            return;
-        }
-
-        let Some((x, y, w, h)) = self.selection.region else {
-            return;
-        };
-
-        if w <= 10.0 || h <= 10.0 {
-            return;
-        }
-
-        // Add bounds offset
-        let abs_x = bounds.x + x;
-        let abs_y = bounds.y + y;
-
-        let grid_color = Color::from_rgba(1.0, 1.0, 1.0, 0.3);
-        let third_w = w / 3.0;
-        let third_h = h / 3.0;
-
-        // 2 vertical
-        for i in 1..3 {
-            let line_x = abs_x + third_w * i as f32;
-            draw_quad(
-                renderer,
-                Rectangle::new(Point::new(line_x, abs_y), Size::new(1.0, h)),
-                grid_color,
-            );
-        }
-
-        // 2 horizontal
-        for i in 1..3 {
-            let line_y = abs_y + third_h * i as f32;
-            draw_quad(
-                renderer,
-                Rectangle::new(Point::new(abs_x, line_y), Size::new(w, 1.0)),
-                grid_color,
-            );
-        }
-    }
-}
-
-impl Widget<AppMessage, cosmic::Theme, Renderer> for CropOverlay {
-    fn size(&self) -> Size<Length> {
-        Size::new(Length::Fill, Length::Fill)
-    }
-
-    fn layout(&self, _tree: &mut Tree, _renderer: &Renderer, limits: &Limits) -> Node {
-        Node::new(limits.max())
-    }
-
-    fn draw(
-        &self,
-        _tree: &Tree,
-        renderer: &mut Renderer,
-        _theme: &cosmic::Theme,
-        _style: &cosmic::iced::advanced::renderer::Style,
-        layout: Layout<'_>,
-        _cursor: Cursor,
-        _viewport: &Rectangle,
-    ) {
-        let bounds = layout.bounds();
-
-        self.draw_overlay(renderer, bounds);
-        self.draw_border(renderer, bounds);
-        self.draw_handles(renderer, bounds);
-        self.draw_grid(renderer, bounds);
-    }
-
-    fn on_event(
-        &mut self,
-        _tree: &mut Tree,
-        event: Event,
-        layout: Layout<'_>,
-        cursor: Cursor,
-        _renderer: &Renderer,
-        _clipboard: &mut dyn Clipboard,
-        shell: &mut Shell<'_, AppMessage>,
-        _viewport: &Rectangle,
-    ) -> Status {
-        let bounds = layout.bounds();
-
-        match event {
-            Event::Mouse(mouse::Event::ButtonPressed(Button::Left)) => {
-                if let Some(pos) = cursor.position_in(bounds) {
-                    let handle = self.hit_test_handle(pos);
-
-                    if handle == DragHandle::Move {
-                        use std::time::{Duration, Instant};
-                        let now = Instant::now();
-                        if let Some(last) = self.last_click {
-                            if now.duration_since(last) < Duration::from_millis(400) {
-                                shell.publish(AppMessage::ApplyCrop);
-                                self.last_click = None;
-                                return Status::Captured;
-                            }
-                        }
-                        self.last_click = Some(now);
-                    }
-
-                    shell.publish(AppMessage::CropDragStart {
-                        x: pos.x,
-                        y: pos.y,
-                        handle,
-                    });
-                    return Status::Captured;
-                }
-            }
-            Event::Mouse(mouse::Event::CursorMoved { .. }) => {
-                if self.selection.is_dragging {
-                    if let Some(pos) = cursor.position_in(bounds) {
-                        shell.publish(AppMessage::CropDragMove {
-                            x: pos.x,
-                            y: pos.y,
-                            max_x: bounds.width,
-                            max_y: bounds.height,
-                        });
-                        return Status::Captured;
-                    }
-                }
-            }
-            Event::Mouse(mouse::Event::ButtonReleased(Button::Left)) => {
-                if self.selection.is_dragging {
-                    shell.publish(AppMessage::CropDragEnd);
-                    return Status::Captured;
-                }
-            }
-            _ => {}
-        }
-
-        Status::Ignored
-    }
-
-    fn mouse_interaction(
-        &self,
-        _tree: &Tree,
-        layout: Layout<'_>,
-        cursor: Cursor,
-        _viewport: &Rectangle,
-        _renderer: &Renderer,
-    ) -> mouse::Interaction {
-        let bounds = layout.bounds();
-
-        if let Some(pos) = cursor.position_in(bounds) {
-            let handle = self.hit_test_handle(pos);
-            return match handle {
-                DragHandle::TopLeft | DragHandle::BottomRight => {
-                    mouse::Interaction::ResizingDiagonallyDown
-                }
-                DragHandle::TopRight | DragHandle::BottomLeft => {
-                    mouse::Interaction::ResizingDiagonallyUp
-                }
-                DragHandle::Top | DragHandle::Bottom => mouse::Interaction::ResizingVertically,
-                DragHandle::Left | DragHandle::Right => mouse::Interaction::ResizingHorizontally,
-                DragHandle::Move => mouse::Interaction::Grabbing,
-                DragHandle::None => mouse::Interaction::Crosshair,
-            };
-        }
-
-        mouse::Interaction::None
-    }
-}
-
-impl<'a> From<CropOverlay> for Element<'a, AppMessage> {
-    fn from(widget: CropOverlay) -> Self {
-        Element::new(widget)
-    }
-}
-
-fn point_in_handle(point: Point, handle_center: Point) -> bool {
-    let half = HANDLE_HIT_SIZE / 2.0;
-    point.x >= handle_center.x - half
-        && point.x <= handle_center.x + half
-        && point.y >= handle_center.y - half
-        && point.y <= handle_center.y + half
-}
-
-fn draw_quad(renderer: &mut Renderer, bounds: Rectangle, color: Color) {
-    renderer.fill_quad(
-        Quad {
-            bounds,
-            ..Quad::default()
-        },
-        color,
-    );
-}
-
-pub fn crop_overlay<'a>(selection: &CropSelection, show_grid: bool) -> Element<'a, AppMessage> {
-    CropOverlay::new(selection, show_grid).into()
-}
diff --git a/src/ui/widgets/image_viewer.rs b/src/ui/widgets/image_viewer.rs
deleted file mode 100644
index 01a30d9..0000000
--- a/src/ui/widgets/image_viewer.rs
+++ /dev/null
@@ -1,559 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/app/view/image_viewer.rs
-//
-// Zoom and pan image viewer widget with external state control.
-// Forked from cosmic::iced to support external state control.
-
-use cosmic::iced::advanced::image as img_renderer;
-use cosmic::iced::advanced::layout;
-use cosmic::iced::advanced::renderer;
-use cosmic::iced::advanced::widget::tree::{self, Tree};
-use cosmic::iced::advanced::widget::Widget;
-use cosmic::iced::advanced::{Clipboard, Layout, Shell};
-use cosmic::iced::event::{self, Event};
-use cosmic::iced::mouse;
-use cosmic::iced::widget::image::FilterMethod;
-use cosmic::iced::{ContentFit, Element, Length, Pixels, Point, Radians, Rectangle, Size, Vector};
-
-/// Tolerance for scale comparisons in widget state synchronization.
-const SCALE_EPSILON: f32 = 0.0001;
-
-/// Tolerance for offset comparisons in widget state synchronization.
-const OFFSET_EPSILON: f32 = 0.01;
-
-/// Callback type for notifying viewer state changes (scale, `offset_x`, `offset_y`, `canvas_size`, `image_size`).
-type StateChangeCallback<Message> = Box<dyn Fn(f32, f32, f32, Size, Size) -> Message>;
-
-/// A frame that displays an image with the ability to zoom in/out and pan.
-#[allow(missing_debug_implementations)]
-pub struct Viewer<Handle, Message> {
-    padding: f32,
-    width: Length,
-    height: Length,
-    min_scale: f32,
-    max_scale: f32,
-    scale_step: f32,
-    handle: Handle,
-    filter_method: FilterMethod,
-    content_fit: ContentFit,
-    /// Optional external state to override internal state (scale, offset)
-    external_state: Option<(f32, Vector)>,
-    /// Optional callback to notify state changes
-    on_state_change: Option<StateChangeCallback<Message>>,
-    /// Disable pan interaction (for crop mode)
-    disable_pan: bool,
-}
-
-impl<Handle, Message> Viewer<Handle, Message> {
-    /// Creates a new [`Viewer`] with the given handle.
-    pub fn new<T: Into<Handle>>(handle: T) -> Self {
-        Viewer {
-            handle: handle.into(),
-            padding: 0.0,
-            width: Length::Shrink,
-            height: Length::Shrink,
-            min_scale: 0.25,
-            max_scale: 10.0,
-            scale_step: 0.10,
-            filter_method: FilterMethod::default(),
-            content_fit: ContentFit::default(),
-            external_state: None,
-            on_state_change: None,
-            disable_pan: false,
-        }
-    }
-
-    /// Set external state to control zoom and pan from outside.
-    /// This allows keyboard/button controls to override the internal state.
-    pub fn with_state(mut self, scale: f32, offset_x: f32, offset_y: f32) -> Self {
-        self.external_state = Some((scale, Vector::new(offset_x, offset_y)));
-        self
-    }
-
-    /// Set a callback to be notified when the state changes (for mouse interaction).
-    pub fn on_state_change<F>(mut self, f: F) -> Self
-    where
-        F: 'static + Fn(f32, f32, f32, Size, Size) -> Message,
-    {
-        self.on_state_change = Some(Box::new(f));
-        self
-    }
-
-    /// Disable pan interaction (useful when overlaying crop tools).
-    pub fn disable_pan(mut self, disable: bool) -> Self {
-        self.disable_pan = disable;
-        self
-    }
-
-    /// Sets the [`FilterMethod`] of the [`Viewer`].
-    pub fn filter_method(mut self, filter_method: FilterMethod) -> Self {
-        self.filter_method = filter_method;
-        self
-    }
-
-    /// Sets the [`ContentFit`] of the [`Viewer`].
-    pub fn content_fit(mut self, content_fit: ContentFit) -> Self {
-        self.content_fit = content_fit;
-        self
-    }
-
-    /// Sets the padding of the [`Viewer`].
-    pub fn padding(mut self, padding: impl Into<Pixels>) -> Self {
-        self.padding = padding.into().0;
-        self
-    }
-
-    /// Sets the width of the [`Viewer`].
-    pub fn width(mut self, width: impl Into<Length>) -> Self {
-        self.width = width.into();
-        self
-    }
-
-    /// Sets the height of the [`Viewer`].
-    pub fn height(mut self, height: impl Into<Length>) -> Self {
-        self.height = height.into();
-        self
-    }
-
-    /// Sets the max scale applied to the image of the [`Viewer`].
-    ///
-    /// Default is `10.0`
-    pub fn max_scale(mut self, max_scale: f32) -> Self {
-        self.max_scale = max_scale;
-        self
-    }
-
-    /// Sets the min scale applied to the image of the [`Viewer`].
-    ///
-    /// Default is `0.25`
-    pub fn min_scale(mut self, min_scale: f32) -> Self {
-        self.min_scale = min_scale;
-        self
-    }
-
-    /// Sets the percentage the image of the [`Viewer`] will be scaled by
-    /// when zoomed in / out.
-    ///
-    /// Default is `0.10`
-    pub fn scale_step(mut self, scale_step: f32) -> Self {
-        self.scale_step = scale_step;
-        self
-    }
-}
-
-impl<Message, Theme, Renderer, Handle> Widget<Message, Theme, Renderer> for Viewer<Handle, Message>
-where
-    Renderer: img_renderer::Renderer<Handle = Handle>,
-    Handle: Clone,
-    Message: Clone,
-{
-    fn tag(&self) -> tree::Tag {
-        tree::Tag::of::<State>()
-    }
-
-    fn state(&self) -> tree::State {
-        let mut state = State::new();
-        // Apply external state if provided at creation
-        if let Some((scale, offset)) = self.external_state {
-            state.scale = scale;
-            state.current_offset = offset;
-            state.starting_offset = offset;
-        }
-        tree::State::new(state)
-    }
-
-    fn diff(&mut self, tree: &mut Tree) {
-        // Sync external state into internal state when user is not dragging
-        if let Some((ext_scale, ext_offset)) = self.external_state {
-            let state = tree.state.downcast_mut::<State>();
-
-            // Only apply external state if user is not currently dragging
-            if !state.is_cursor_grabbed() {
-                // Check if external state differs significantly from current state
-                let scale_changed = (state.scale - ext_scale).abs() > SCALE_EPSILON;
-                let offset_changed = (state.current_offset.x - ext_offset.x).abs() > OFFSET_EPSILON
-                    || (state.current_offset.y - ext_offset.y).abs() > OFFSET_EPSILON;
-
-                if scale_changed || offset_changed {
-                    state.scale = ext_scale;
-                    state.current_offset = ext_offset;
-                    state.starting_offset = ext_offset;
-                }
-            }
-        }
-    }
-
-    fn size(&self) -> Size<Length> {
-        Size {
-            width: self.width,
-            height: self.height,
-        }
-    }
-
-    fn layout(
-        &self,
-        _tree: &mut Tree,
-        renderer: &Renderer,
-        limits: &layout::Limits,
-    ) -> layout::Node {
-        let image_size = renderer.measure_image(&self.handle);
-        let image_size = Size::new(image_size.width as f32, image_size.height as f32);
-
-        let raw_size = limits.resolve(self.width, self.height, image_size);
-        let full_size = self.content_fit.fit(image_size, raw_size);
-
-        let final_size = Size {
-            width: match self.width {
-                Length::Shrink => f32::min(raw_size.width, full_size.width),
-                _ => raw_size.width,
-            },
-            height: match self.height {
-                Length::Shrink => f32::min(raw_size.height, full_size.height),
-                _ => raw_size.height,
-            },
-        };
-
-        layout::Node::new(final_size)
-    }
-
-    fn on_event(
-        &mut self,
-        tree: &mut Tree,
-        event: Event,
-        layout: Layout<'_>,
-        cursor: mouse::Cursor,
-        renderer: &Renderer,
-        _clipboard: &mut dyn Clipboard,
-        shell: &mut Shell<'_, Message>,
-        _viewport: &Rectangle,
-    ) -> event::Status {
-        let bounds = layout.bounds();
-
-        match event {
-            Event::Mouse(mouse::Event::WheelScrolled { delta }) => {
-                let Some(cursor_position) = cursor.position_over(bounds) else {
-                    return event::Status::Ignored;
-                };
-
-                match delta {
-                    mouse::ScrollDelta::Lines { y, .. } | mouse::ScrollDelta::Pixels { y, .. } => {
-                        let state = tree.state.downcast_mut::<State>();
-                        let previous_scale = state.scale;
-
-                        if y < 0.0 && previous_scale > self.min_scale
-                            || y > 0.0 && previous_scale < self.max_scale
-                        {
-                            state.scale = (if y > 0.0 {
-                                state.scale * (1.0 + self.scale_step)
-                            } else {
-                                state.scale / (1.0 + self.scale_step)
-                            })
-                            .clamp(self.min_scale, self.max_scale);
-
-                            let scale_factor = state.scale / previous_scale;
-
-                            // Cursor position relative to the image center (not bounds center)
-                            // The image is centered in bounds, so bounds.center() is correct
-                            let cursor_to_center = cursor_position - bounds.center();
-
-                            // Transform offset so the point under cursor stays stationary
-                            // Formula: new_offset = old_offset * scale_factor + cursor_to_center * (scale_factor - 1)
-                            let new_offset = Vector::new(
-                                state.current_offset.x * scale_factor
-                                    + cursor_to_center.x * (scale_factor - 1.0),
-                                state.current_offset.y * scale_factor
-                                    + cursor_to_center.y * (scale_factor - 1.0),
-                            );
-
-                            // Clamp offset to valid range
-                            let scaled_size = scaled_image_size(
-                                renderer,
-                                &self.handle,
-                                state,
-                                bounds.size(),
-                                self.content_fit,
-                            );
-
-                            state.current_offset =
-                                clamp_offset(new_offset, bounds.size(), scaled_size);
-
-                            // Notify state change
-                            if let Some(ref on_change) = self.on_state_change {
-                                let image_size = renderer.measure_image(&self.handle);
-                                let image_size =
-                                    Size::new(image_size.width as f32, image_size.height as f32);
-                                shell.publish(on_change(
-                                    state.scale,
-                                    state.current_offset.x,
-                                    state.current_offset.y,
-                                    bounds.size(),
-                                    image_size,
-                                ));
-                            }
-                        }
-                    }
-                }
-
-                event::Status::Captured
-            }
-            Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Left)) => {
-                if self.disable_pan {
-                    return event::Status::Ignored;
-                }
-
-                let Some(cursor_position) = cursor.position_over(bounds) else {
-                    return event::Status::Ignored;
-                };
-
-                let state = tree.state.downcast_mut::<State>();
-                state.cursor_grabbed_at = Some(cursor_position);
-                state.starting_offset = state.current_offset;
-
-                event::Status::Captured
-            }
-            Event::Mouse(mouse::Event::ButtonReleased(mouse::Button::Left)) => {
-                if self.disable_pan {
-                    return event::Status::Ignored;
-                }
-
-                let state = tree.state.downcast_mut::<State>();
-
-                if state.cursor_grabbed_at.is_some() {
-                    state.cursor_grabbed_at = None;
-
-                    // Notify final state after drag ends
-                    if let Some(ref on_change) = self.on_state_change {
-                        let image_size = renderer.measure_image(&self.handle);
-                        let image_size =
-                            Size::new(image_size.width as f32, image_size.height as f32);
-                        shell.publish(on_change(
-                            state.scale,
-                            state.current_offset.x,
-                            state.current_offset.y,
-                            bounds.size(),
-                            image_size,
-                        ));
-                    }
-
-                    event::Status::Captured
-                } else {
-                    event::Status::Ignored
-                }
-            }
-            Event::Mouse(mouse::Event::CursorMoved { position }) => {
-                if self.disable_pan {
-                    return event::Status::Ignored;
-                }
-
-                let state = tree.state.downcast_mut::<State>();
-
-                if let Some(origin) = state.cursor_grabbed_at {
-                    let scaled_size = scaled_image_size(
-                        renderer,
-                        &self.handle,
-                        state,
-                        bounds.size(),
-                        self.content_fit,
-                    );
-
-                    let delta = position - origin;
-
-                    // Pan: subtract delta from starting offset
-                    let new_offset = Vector::new(
-                        state.starting_offset.x - delta.x,
-                        state.starting_offset.y - delta.y,
-                    );
-
-                    state.current_offset = clamp_offset(new_offset, bounds.size(), scaled_size);
-
-                    // Notify state change during pan
-                    if let Some(ref on_change) = self.on_state_change {
-                        let image_size = renderer.measure_image(&self.handle);
-                        let image_size =
-                            Size::new(image_size.width as f32, image_size.height as f32);
-                        shell.publish(on_change(
-                            state.scale,
-                            state.current_offset.x,
-                            state.current_offset.y,
-                            bounds.size(),
-                            image_size,
-                        ));
-                    }
-
-                    event::Status::Captured
-                } else {
-                    event::Status::Ignored
-                }
-            }
-            _ => event::Status::Ignored,
-        }
-    }
-
-    fn mouse_interaction(
-        &self,
-        tree: &Tree,
-        layout: Layout<'_>,
-        cursor: mouse::Cursor,
-        _viewport: &Rectangle,
-        _renderer: &Renderer,
-    ) -> mouse::Interaction {
-        let state = tree.state.downcast_ref::<State>();
-        let bounds = layout.bounds();
-        let is_mouse_over = cursor.is_over(bounds);
-
-        if state.is_cursor_grabbed() {
-            mouse::Interaction::Grabbing
-        } else if is_mouse_over {
-            mouse::Interaction::Grab
-        } else {
-            mouse::Interaction::None
-        }
-    }
-
-    fn draw(
-        &self,
-        tree: &Tree,
-        renderer: &mut Renderer,
-        _theme: &Theme,
-        _style: &renderer::Style,
-        layout: Layout<'_>,
-        _cursor: mouse::Cursor,
-        _viewport: &Rectangle,
-    ) {
-        let state = tree.state.downcast_ref::<State>();
-        let bounds = layout.bounds();
-
-        let scaled_size = scaled_image_size(
-            renderer,
-            &self.handle,
-            state,
-            bounds.size(),
-            self.content_fit,
-        );
-
-        // Calculate translation to center the image and apply offset
-        let translation = {
-            // How much space is left after placing the scaled image
-            let diff_w = bounds.width - scaled_size.width;
-            let diff_h = bounds.height - scaled_size.height;
-
-            // Base position: center the image in the viewport
-            // For images smaller than viewport: center them (diff > 0)
-            // For images larger than viewport: they extend beyond bounds (diff < 0)
-            let center_offset = Vector::new(diff_w / 2.0, diff_h / 2.0);
-
-            // Apply pan offset (offset moves the "camera", so subtract it)
-            // Positive offset = looking at right/bottom part = image moves left/up
-            center_offset - state.current_offset
-        };
-
-        let drawing_bounds = Rectangle::new(bounds.position(), scaled_size);
-
-        let render = |renderer: &mut Renderer| {
-            renderer.with_translation(translation, |renderer| {
-                renderer.draw_image(
-                    self.handle.clone(),
-                    self.filter_method,
-                    drawing_bounds,
-                    Radians(0.0),
-                    1.0,
-                    [0.0; 4],
-                );
-            });
-        };
-
-        renderer.with_layer(bounds, render);
-    }
-}
-
-/// The local state of a [`Viewer`].
-#[derive(Debug, Clone, Copy)]
-pub struct State {
-    scale: f32,
-    starting_offset: Vector,
-    current_offset: Vector,
-    cursor_grabbed_at: Option<Point>,
-}
-
-impl Default for State {
-    fn default() -> Self {
-        Self {
-            scale: 1.0,
-            starting_offset: Vector::default(),
-            current_offset: Vector::default(),
-            cursor_grabbed_at: None,
-        }
-    }
-}
-
-impl State {
-    /// Creates a new [`State`].
-    pub fn new() -> Self {
-        State::default()
-    }
-
-    /// Returns if the cursor is currently grabbed by the [`Viewer`].
-    pub fn is_cursor_grabbed(&self) -> bool {
-        self.cursor_grabbed_at.is_some()
-    }
-}
-
-/// Clamps the offset to keep the image within reasonable bounds.
-///
-/// The offset represents how far the viewport's center is displaced from the image's center.
-/// - offset (0, 0) = image centered
-/// - positive offset = viewing right/bottom part of image
-/// - negative offset = viewing left/top part of image
-fn clamp_offset(offset: Vector, viewport_size: Size, image_size: Size) -> Vector {
-    // Maximum allowed offset in each direction
-    // When image is larger than viewport, allow panning up to image edge
-    // When image is smaller than viewport, no panning needed (clamp to 0)
-    let max_offset_x = ((image_size.width - viewport_size.width) / 2.0).max(0.0);
-    let max_offset_y = ((image_size.height - viewport_size.height) / 2.0).max(0.0);
-
-    Vector::new(
-        offset.x.clamp(-max_offset_x, max_offset_x),
-        offset.y.clamp(-max_offset_y, max_offset_y),
-    )
-}
-
-impl<'a, Message, Theme, Renderer, Handle> From<Viewer<Handle, Message>>
-    for Element<'a, Message, Theme, Renderer>
-where
-    Renderer: 'a + img_renderer::Renderer<Handle = Handle>,
-    Message: 'a + Clone,
-    Handle: Clone + 'a,
-{
-    fn from(viewer: Viewer<Handle, Message>) -> Element<'a, Message, Theme, Renderer> {
-        Element::new(viewer)
-    }
-}
-
-/// Returns the scaled size of the image given current state.
-/// Calculate the scaled image size after applying content fit and zoom.
-///
-/// This is the canonical implementation used by the viewer widget.
-/// A simplified version exists in `document::utils::scaled_image_size`.
-pub fn scaled_image_size<Renderer>(
-    renderer: &Renderer,
-    handle: &<Renderer as img_renderer::Renderer>::Handle,
-    state: &State,
-    bounds: Size,
-    content_fit: ContentFit,
-) -> Size
-where
-    Renderer: img_renderer::Renderer,
-{
-    let Size { width, height } = renderer.measure_image(handle);
-    let image_size = Size::new(width as f32, height as f32);
-
-    let adjusted_fit = match content_fit {
-        ContentFit::None => image_size,
-        _ => content_fit.fit(image_size, bounds),
-    };
-
-    Size::new(
-        adjusted_fit.width * state.scale,
-        adjusted_fit.height * state.scale,
-    )
-}
diff --git a/src/ui/widgets/mod.rs b/src/ui/widgets/mod.rs
deleted file mode 100644
index fc0a669..0000000
--- a/src/ui/widgets/mod.rs
+++ /dev/null
@@ -1,13 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-or-later
-// src/ui/widgets/mod.rs
-//
-// Custom widgets module.
-
-pub mod crop_model;
-pub mod crop_overlay;
-pub mod image_viewer;
-
-// Re-exports for convenience
-pub use crop_model::{CropSelection, DragHandle};
-pub use crop_overlay::crop_overlay;
-pub use image_viewer::Viewer;
diff --git a/src/workspace/manager.rs b/src/workspace/manager.rs
new file mode 100644
index 0000000..3b17348
--- /dev/null
+++ b/src/workspace/manager.rs
@@ -0,0 +1,174 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// src/workspace/manager.rs
+//
+// Workspace operations: session and item CRUD, reordering, and RON persistence.
+
+use crate::workspace::model::{Item, Session, Workspace};
+use anyhow::{Context, Result};
+use std::path::Path;
+use uuid::Uuid;
+
+impl Workspace {
+    /// Serialize the workspace to a RON file.
+    pub fn save(&self, path: impl AsRef<Path>) -> Result<()> {
+        let config = ron::ser::PrettyConfig::default();
+        let data =
+            ron::ser::to_string_pretty(self, config).context("Failed to serialize workspace")?;
+        std::fs::write(&path, data).context("Failed to write workspace file")?;
+        Ok(())
+    }
+
+    /// Deserialize a workspace from a RON file.
+    pub fn load(path: impl AsRef<Path>) -> Result<Self> {
+        let data = std::fs::read_to_string(&path).context("Failed to read workspace file")?;
+        let workspace: Workspace =
+            ron::from_str(&data).context("Failed to deserialize workspace")?;
+        Ok(workspace)
+    }
+
+    pub fn add_session(&mut self, session: Session) {
+        self.sessions.push(session);
+    }
+
+    pub fn remove_session(&mut self, session_id: Uuid) -> Result<Session> {
+        let pos = self.session_pos(session_id)?;
+        Ok(self.sessions.remove(pos))
+    }
+
+    pub fn copy_session(&mut self, session_id: Uuid) -> Result<Uuid> {
+        let pos = self.session_pos(session_id)?;
+        let mut clone = self.sessions[pos].clone();
+        clone.id = Uuid::new_v4();
+        clone.name = format!("{} (copy)", clone.name);
+        for item in &mut clone.items {
+            item.id = Uuid::new_v4();
+        }
+        let new_id = clone.id;
+        self.sessions.push(clone);
+        Ok(new_id)
+    }
+
+    pub fn move_session(&mut self, session_id: Uuid, new_index: usize) -> Result<()> {
+        let pos = self.session_pos(session_id)?;
+        let session = self.sessions.remove(pos);
+        let insert_at = new_index.min(self.sessions.len());
+        self.sessions.insert(insert_at, session);
+        Ok(())
+    }
+
+    pub fn rename_session(&mut self, session_id: Uuid, new_name: impl Into<String>) -> Result<()> {
+        let session = self.session_mut(session_id)?;
+        session.name = new_name.into();
+        Ok(())
+    }
+
+    pub fn add_item(&mut self, session_id: Uuid, item: Item) -> Result<()> {
+        let session = self.session_mut(session_id)?;
+        session.items.push(item);
+        Ok(())
+    }
+
+    pub fn remove_item(&mut self, session_id: Uuid, item_id: Uuid) -> Result<Item> {
+        let session = self.session_mut(session_id)?;
+        let pos = item_pos(&session.items, item_id)?;
+        Ok(session.items.remove(pos))
+    }
+
+    /// Move an item within the same session or between two sessions.
+    pub fn move_item(
+        &mut self,
+        from_session: Uuid,
+        item_id: Uuid,
+        to_session: Uuid,
+        to_index: usize,
+    ) -> Result<()> {
+        let item = self.remove_item(from_session, item_id)?;
+        let target = self.session_mut(to_session)?;
+        let insert_at = to_index.min(target.items.len());
+        target.items.insert(insert_at, item);
+        Ok(())
+    }
+
+    /// Copy an item within the same session or between two sessions.
+    pub fn copy_item(
+        &mut self,
+        from_session: Uuid,
+        item_id: Uuid,
+        to_session: Uuid,
+        to_index: usize,
+    ) -> Result<Uuid> {
+        let source = self.session(from_session)?;
+        let pos = item_pos(&source.items, item_id)?;
+        let mut clone = source.items[pos].clone();
+        clone.id = Uuid::new_v4();
+        clone.name = format!("{} (copy)", clone.name);
+        let new_id = clone.id;
+
+        let target = self.session_mut(to_session)?;
+        let insert_at = to_index.min(target.items.len());
+        target.items.insert(insert_at, clone);
+        Ok(new_id)
+    }
+
+    pub fn rename_item(
+        &mut self,
+        session_id: Uuid,
+        item_id: Uuid,
+        new_name: impl Into<String>,
+    ) -> Result<()> {
+        let session = self.session_mut(session_id)?;
+        let pos = item_pos(&session.items, item_id)?;
+        session.items[pos].name = new_name.into();
+        Ok(())
+    }
+
+    /// Read-only access to a session by id.
+    pub fn session(&self, id: Uuid) -> Result<&Session> {
+        self.sessions
+            .iter()
+            .find(|s| s.id == id)
+            .context(format!("Session {id} not found"))
+    }
+
+    /// Read-only access to a session by name.
+    pub fn session_by_name(&self, name: &str) -> Result<&Session> {
+        self.sessions
+            .iter()
+            .find(|s| s.name == name)
+            .context(format!("Session {name:?} not found"))
+    }
+
+    /// Find an item by name within a session.
+    pub fn item_by_name(&self, session_id: Uuid, name: &str) -> Result<&Item> {
+        let session = self.session(session_id)?;
+        session
+            .items
+            .iter()
+            .find(|i| i.name == name)
+            .context(format!(
+                "Item {name:?} not found in session {:?}",
+                session.name
+            ))
+    }
+
+    fn session_mut(&mut self, id: Uuid) -> Result<&mut Session> {
+        self.sessions
+            .iter_mut()
+            .find(|s| s.id == id)
+            .context(format!("Session {id} not found"))
+    }
+
+    fn session_pos(&self, id: Uuid) -> Result<usize> {
+        self.sessions
+            .iter()
+            .position(|s| s.id == id)
+            .context(format!("Session {id} not found"))
+    }
+}
+
+fn item_pos(items: &[Item], id: Uuid) -> Result<usize> {
+    items
+        .iter()
+        .position(|i| i.id == id)
+        .context(format!("Item {id} not found"))
+}
diff --git a/src/workspace/mod.rs b/src/workspace/mod.rs
new file mode 100644
index 0000000..330ed70
--- /dev/null
+++ b/src/workspace/mod.rs
@@ -0,0 +1,7 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// src/workspace/mod.rs
+//
+// Workspace subsystem: data model, operations, and persistence.
+
+pub mod manager;
+pub mod model;
diff --git a/src/workspace/model.rs b/src/workspace/model.rs
new file mode 100644
index 0000000..4d0e008
--- /dev/null
+++ b/src/workspace/model.rs
@@ -0,0 +1,100 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// src/workspace/model.rs
+//
+// Pure data structures for the workspace, sessions, and their items.
+
+use serde::{Deserialize, Serialize};
+use std::path::PathBuf;
+use uuid::Uuid;
+
+/// The document kind an item references.
+///
+/// Each variant carries the path to the source file. Format-specific fields
+/// (e.g. page index for PDFs) live on the variant so they can differ per kind.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub enum ItemKind {
+    Portable { path: PathBuf },
+    Raster { path: PathBuf },
+    Vector { path: PathBuf },
+    Document { path: PathBuf },
+}
+
+impl ItemKind {
+    /// Returns the file path regardless of the variant.
+    pub fn path(&self) -> &PathBuf {
+        match self {
+            ItemKind::Portable { path }
+            | ItemKind::Raster { path }
+            | ItemKind::Vector { path }
+            | ItemKind::Document { path } => path,
+        }
+    }
+}
+
+/// A single entry in a session.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Item {
+    pub id: Uuid,
+    pub name: String,
+    pub kind: ItemKind,
+    pub tags: Vec<String>,
+}
+
+impl Item {
+    pub fn new(name: impl Into<String>, kind: ItemKind) -> Self {
+        Self {
+            id: Uuid::new_v4(),
+            name: name.into(),
+            kind,
+            tags: Vec::new(),
+        }
+    }
+
+    pub fn with_tags(mut self, tags: Vec<String>) -> Self {
+        self.tags = tags;
+        self
+    }
+}
+
+/// Determines how a session behaves in the UI.
+#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
+pub enum SessionType {
+    Browser,
+    Collection,
+}
+
+/// A named group of items inside a workspace.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Session {
+    pub id: Uuid,
+    pub name: String,
+    pub session_type: SessionType,
+    pub items: Vec<Item>,
+}
+
+impl Session {
+    pub fn new(name: impl Into<String>, session_type: SessionType) -> Self {
+        Self {
+            id: Uuid::new_v4(),
+            name: name.into(),
+            session_type,
+            items: Vec::new(),
+        }
+    }
+}
+
+/// The top-level container that is persisted as a `.ws.ron` file.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Workspace {
+    pub name: String,
+    pub sessions: Vec<Session>,
+}
+
+impl Workspace {
+    pub fn new(name: impl Into<String>) -> Self {
+        Self {
+            name: name.into(),
+            sessions: Vec::new(),
+        }
+    }
+}
diff --git a/test.json b/test.json
new file mode 100644
index 0000000..4dd1247
--- /dev/null
+++ b/test.json
@@ -0,0 +1,94 @@
+[
+  { "NewWorkspace": "Demo Projekt" },
+
+  { "CreateSession": { "name": "Referenzen", "session_type": "browser" } },
+  {
+    "AddItem": {
+      "session": "Referenzen",
+      "name": "Logo",
+      "kind": "vector",
+      "path": "tmp/pictures/logo.svg"
+    }
+  },
+  {
+    "AddItem": {
+      "session": "Referenzen",
+      "name": "Foto Hintergrund",
+      "kind": "raster",
+      "path": "tmp/pictures/hero.jpg"
+    }
+  },
+  {
+    "AddItem": {
+      "session": "Referenzen",
+      "name": "Handbuch",
+      "kind": "portable",
+      "path": "tmp/pictures/handbook.pdf"
+    }
+  },
+  { "ViewSession": "Referenzen" },
+
+  { "SelectSession": "Referenzen" },
+  { "SelectItem": 0 },
+  "NextItem",
+  "NextItem",
+  "PreviousItem",
+  { "SelectItem": 0 },
+  "MoveItemDown",
+  { "ViewSession": "Referenzen" },
+  "MoveItemUp",
+  { "ViewSession": "Referenzen" },
+  { "MoveItemToIndex": 2 },
+  { "ViewSession": "Referenzen" },
+  { "MoveItemToIndex": 0 },
+
+  { "CreateSession": { "name": "Favoriten", "session_type": "collection" } },
+  { "CreateSession": { "name": "Archiv", "session_type": "collection" } },
+  "ViewWorkspace",
+
+  { "CopyItem": { "from": "Referenzen", "item": "Logo", "to": "Favoriten" } },
+  {
+    "CopyItem": {
+      "from": "Referenzen",
+      "item": "Foto Hintergrund",
+      "to": "Favoriten"
+    }
+  },
+  { "ViewSession": "Favoriten" },
+
+  {
+    "RenameItem": {
+      "session": "Favoriten",
+      "item": "Logo (copy)",
+      "name": "Hauptlogo"
+    }
+  },
+  { "ViewSession": "Favoriten" },
+
+  {
+    "RemoveItem": { "session": "Favoriten", "item": "Foto Hintergrund (copy)" }
+  },
+  { "ViewSession": "Favoriten" },
+
+  { "MoveItem": { "from": "Referenzen", "item": "Handbuch", "to": "Archiv" } },
+  { "ViewSession": "Referenzen" },
+  { "ViewSession": "Archiv" },
+
+  { "CopySession": "Referenzen" },
+  "ViewWorkspace",
+
+  {
+    "RenameSession": {
+      "session": "Referenzen (copy)",
+      "name": "Backup Referenzen"
+    }
+  },
+  "ViewWorkspace",
+
+  { "DeleteSession": "Archiv" },
+  "ViewWorkspace",
+
+  { "SaveWorkspace": "tmp/demo.ws.ron" },
+  { "LoadWorkspace": "tmp/demo.ws.ron" },
+  "ViewWorkspace"
+]