feat(wallpaper-store): enhance previews, EXIF handling, and shuffle

These changes add image previews and robust image handling across platforms.
Android, desktop, and TS UI now share imagePreviews data and a
persistent shuffle queue, improving ordering and previews.
EXIF orientation is applied when decoding images and rendering crops.
Manifest and rendering paths were adjusted for portrait mode.

- Introduce imagePreviews in models and UI to show per-image crop data.
- Implement EXIF orientation handling and enhanced cropping.
- Improve shuffle with persistent queue and seen-tracking.

plugins/src/desktop.rs

@@ -15,6 +15,20 @@ pub struct Wallpaper<R: Runtime>(AppHandle<R>);
 
 impl<R: Runtime> Wallpaper<R> {
     fn demo() -> WallpaperState {
+        let image_previews = ["alpine", "waterfall", "coast"]
+            .into_iter()
+            .enumerate()
+            .map(|(index, name)| GalleryImage {
+                id: format!("demo-{index}"),
+                url: format!("/wallpapers/{name}.png"),
+                selected: index == 0,
+                crop_mode: "cover".into(),
+                crop_zoom: 1.0,
+                crop_position_x: 0.5,
+                crop_position_y: 0.5,
+                crop_rotation: 0,
+            })
+            .collect();
         WallpaperState {
             image_count: 3,
             enabled: true,
@@ -31,6 +45,7 @@ impl<R: Runtime> Wallpaper<R> {
                 "/wallpapers/waterfall.png".into(),
                 "/wallpapers/coast.png".into(),
             ],
+            image_previews,
         }
     }
     pub fn get_state(&self) -> crate::Result<WallpaperState> {

plugins/src/models.rs

@@ -14,6 +14,8 @@ pub struct WallpaperState {
     pub current_id: Option<String>,
     pub image_ids: Vec<String>,
     pub image_urls: Vec<String>,
+    #[serde(default)]
+    pub image_previews: Vec<GalleryImage>,
 }
 
 #[derive(Debug, Clone, Deserialize, Serialize)]