chore: inital commit

Split project into a Cargo workspace with two crates:

- core/ (noctua_core): UI-independent document library
- ui/ (noctua_ui): COSMIC application scaffold (empty)

justfile for workspace (run, run-cli, check, test, build)

i18n/en/noctua.ftl

@@ -0,0 +1,119 @@
+# 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 = A document and image viewer for the COSMIC desktop
+
+
+## Main window
+window-title = { $filename ->
+    [none] Noctua
+   *[some] { $filename } — Noctua
+}
+
+
+## Menu entries
+menu-main = Menu
+menu-file-open = Open…
+menu-file-quit = Quit
+menu-view-zoom-in = Zoom In
+menu-view-zoom-out = Zoom Out
+menu-view-zoom-reset = Reset Zoom
+menu-view-zoom-fit = Fit to Window
+menu-view-flip-horizontal = Flip Horizontally
+menu-view-flip-vertical = Flip Vertically
+menu-view-rotate-cw = Rotate Clockwise
+menu-view-rotate-ccw = Rotate Counter-Clockwise
+
+
+## Footer / Status bar
+status-zoom-fit = Fit
+status-zoom-percent = { $percent }%
+status-doc-dimensions = { $width } × { $height }
+status-nav-position = { $current } / { $total }
+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
+label-zoom = Zoom
+label-tools = Tools
+label-crop = Crop
+label-scale = Scale
+label-page = Page
+label-pages = Pages
+
+
+## Loading states
+loading-metadata = Loading metadata…
+loading-thumbnails = Loading { $current } / { $total }…
+
+
+## Error messages
+error-failed-to-open = Failed to open "{ $path }"
+error-unsupported-format = Unsupported file format
+error-no-image-loaded = No image loaded
+
+
+## Properties panel
+panel-properties = Properties
+panel-actions = Actions
+
+meta-section-file = File Information
+meta-section-exif = Camera Information
+meta-section-image = Image Information
+
+## File metadata
+meta-filename = Name
+meta-format = Format
+meta-dimensions = Dimensions
+meta-filesize = Size
+meta-colortype = Color Type
+meta-path = Path
+meta-pages = Pages
+meta-current-page = Current Page
+
+## Image metadata
+meta-width = Width
+meta-height = Height
+meta-depth = Bit Depth
+
+## EXIF metadata
+meta-camera = Camera
+meta-datetime = Date Taken
+meta-exposure = Exposure
+meta-aperture = Aperture
+meta-iso = ISO { $iso }
+meta-focal = Focal Length
+meta-gps = GPS Location
+
+## Action buttons
+action-set-wallpaper = Set as Wallpaper
+action-open-with = Open With…
+action-show-in-folder = Show in Folder
+
+
+## Navigation panel (thumbnails)
+nav-panel-title = Pages
+nav-panel-loading = Loading { $current } / { $total }…
+
+
+## Format panel
+format-section-title = Paper Format
+format-section-subtitle = Select paper size for export
+orientation-section-title = Orientation