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/commands.rs

@@ -71,6 +71,10 @@ pub(crate) async fn set_interval<R: Runtime>(app: AppHandle<R>, minutes: usize)
 pub(crate) async fn next_wallpaper<R: Runtime>(app: AppHandle<R>) -> Result<WallpaperState> {
     app.wallpaper().next_wallpaper()
 }
+#[command]
+pub(crate) async fn apply_wallpaper<R: Runtime>(app: AppHandle<R>, id: String) -> Result<WallpaperState> {
+    app.wallpaper().apply_wallpaper(ApplyWallpaperRequest { id })
+}
 
 #[command]
 pub(crate) async fn get_immich_connection<R: Runtime>(app: AppHandle<R>) -> Result<ImmichConnection> {

plugins/src/desktop.rs

@@ -22,6 +22,8 @@ impl<R: Runtime> Wallpaper<R> {
             shuffle: true,
             lock_screen_only: true,
             current_index: 0,
+            current_id: Some("demo-0".into()),
+            image_ids: vec!["demo-0".into(), "demo-1".into(), "demo-2".into()],
             image_urls: vec![
                 "/wallpapers/alpine.png".into(),
                 "/wallpapers/waterfall.png".into(),
@@ -100,6 +102,15 @@ impl<R: Runtime> Wallpaper<R> {
     pub fn next_wallpaper(&self) -> crate::Result<WallpaperState> {
         let mut state = Self::demo();
         state.current_index = 1;
+        state.current_id = Some("demo-1".into());
+        Ok(state)
+    }
+    pub fn apply_wallpaper(&self, payload: ApplyWallpaperRequest) -> crate::Result<WallpaperState> {
+        let mut state = Self::demo();
+        if let Some(index) = state.image_ids.iter().position(|id| id == &payload.id) {
+            state.current_index = index;
+            state.current_id = Some(payload.id);
+        }
         Ok(state)
     }
     pub fn get_immich_connection(&self) -> crate::Result<ImmichConnection> {

plugins/src/lib.rs

@@ -46,6 +46,7 @@ pub fn init<R: Runtime>() -> TauriPlugin<R> {
             commands::set_setting,
             commands::set_interval,
             commands::next_wallpaper,
+            commands::apply_wallpaper,
             commands::get_immich_connection,
             commands::connect_immich,
             commands::disconnect_immich,

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)
     }

plugins/src/models.rs

@@ -9,6 +9,8 @@ pub struct WallpaperState {
     pub shuffle: bool,
     pub lock_screen_only: bool,
     pub current_index: usize,
+    pub current_id: Option<String>,
+    pub image_ids: Vec<String>,
     pub image_urls: Vec<String>,
 }
 
@@ -38,6 +40,12 @@ pub struct DeleteImageRequest {
     pub id: String,
 }
 
+#[derive(Debug, Clone, Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct ApplyWallpaperRequest {
+    pub id: String,
+}
+
 #[derive(Debug, Clone, Deserialize, Serialize)]
 #[serde(rename_all = "camelCase")]
 pub struct DeleteImagesRequest {