refactor: Move image_viewer to widgets/ (it's a widget, not a view)

src/ui/views/canvas.rs

@@ -8,7 +8,7 @@ use cosmic::iced::{ContentFit, Length};
 use cosmic::widget::{container, text};
 use cosmic::Element;
 
-use super::image_viewer::Viewer;
+use crate::ui::widgets::Viewer;
 use crate::ui::model::{ToolMode, ViewMode};
 use crate::ui::{AppMessage, AppModel};
 use crate::application::DocumentManager;

src/ui/views/mod.rs

@@ -7,7 +7,6 @@ pub mod canvas;
 pub mod footer;
 pub mod format_panel;
 pub mod header;
-pub mod image_viewer;
 pub mod pages_panel;
 pub mod panels;
 

src/ui/widgets/mod.rs

@@ -4,5 +4,7 @@
 // Custom widgets module.
 
 pub mod crop_types;
+pub mod image_viewer;
 
 pub use crop_types::{CropRegion, CropSelection, DragHandle};
+pub use image_viewer::Viewer;