feat(wallpaper): add apply_wallpaper workflow and rotation worker

Adds a new apply_wallpaper command and its plumbing across
desktop, mobile, and Android. A WorkManager-based rotation
worker handles applying wallpapers in the background. Wallpaper
state now tracks currentId and imageIds for precise control.

- Introduced apply_wallpaper command across desktop, mobile and Android
- Added WorkManager-based rotation worker to apply wallpapers in the
  background
- Extended wallpaper state with currentId and imageIds and updated schemas/permissions

plugins/src/mobile.rs

@@ -70,6 +70,11 @@ impl<R: Runtime> Wallpaper<R> {
             .run_mobile_plugin("nextWallpaper", ())
             .map_err(Into::into)
     }
+    pub fn apply_wallpaper(&self, payload: ApplyWallpaperRequest) -> crate::Result<WallpaperState> {
+        self.0
+            .run_mobile_plugin("applyWallpaper", payload)
+            .map_err(Into::into)
+    }
     pub fn get_immich_connection(&self) -> crate::Result<ImmichConnection> {
         self.0.run_mobile_plugin("getImmichConnection", ()).map_err(Into::into)
     }