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

src/native.ts

@@ -7,6 +7,8 @@ export type WallpaperState = {
   shuffle: boolean;
   lockScreenOnly: boolean;
   currentIndex: number;
+  currentId: string | null;
+  imageIds: string[];
   imageUrls: string[];
 };
 
@@ -67,6 +69,8 @@ const demoState: WallpaperState = {
   shuffle: true,
   lockScreenOnly: true,
   currentIndex: 0,
+  currentId: "demo-0",
+  imageIds: ["demo-0", "demo-1", "demo-2"],
   imageUrls: ["/wallpapers/alpine.png", "/wallpapers/waterfall.png", "/wallpapers/coast.png"],
 };
 
@@ -102,6 +106,8 @@ export async function deleteImage(id: string): Promise<WallpaperState> {
     demoState.imageUrls.splice(index, 1);
     demoState.imageCount = demoState.imageUrls.length;
     demoState.currentIndex = Math.min(demoState.currentIndex, Math.max(0, demoState.imageCount - 1));
+    demoState.imageIds = demoState.imageUrls.map((_, itemIndex) => `demo-${itemIndex}`);
+    demoState.currentId = demoState.imageIds[demoState.currentIndex] ?? null;
   }
   return { ...demoState, imageUrls: [...demoState.imageUrls] };
 }
@@ -117,6 +123,8 @@ export async function deleteImages(ids: string[]): Promise<WallpaperState> {
   demoState.imageUrls = demoState.imageUrls.filter((_, index) => !indexes.has(index));
   demoState.imageCount = demoState.imageUrls.length;
   demoState.currentIndex = Math.min(demoState.currentIndex, Math.max(0, demoState.imageCount - 1));
+  demoState.imageIds = demoState.imageUrls.map((_, index) => `demo-${index}`);
+  demoState.currentId = demoState.imageIds[demoState.currentIndex] ?? null;
   return { ...demoState, imageUrls: [...demoState.imageUrls] };
 }
 
@@ -156,12 +164,24 @@ export async function setIntervalMinutes(value: number) {
 
 export async function nextWallpaper(): Promise<WallpaperState> {
   if (!inTauri()) {
-    demoState.currentIndex = (demoState.currentIndex + 1) % demoState.imageUrls.length;
+    if (demoState.imageUrls.length) demoState.currentIndex = (demoState.currentIndex + 1) % demoState.imageUrls.length;
+    demoState.currentId = demoState.imageIds[demoState.currentIndex] ?? null;
     return { ...demoState };
   }
   return invoke<WallpaperState>("plugin:wallpaper|next_wallpaper");
 }
 
+export async function applyWallpaper(id: string): Promise<WallpaperState> {
+  if (!inTauri()) {
+    const index = demoState.imageIds.indexOf(id);
+    if (index < 0) throw new Error("Image not found");
+    demoState.currentIndex = index;
+    demoState.currentId = id;
+    return { ...demoState };
+  }
+  return invoke<WallpaperState>("plugin:wallpaper|apply_wallpaper", { id });
+}
+
 export async function getImmichConnection(): Promise<ImmichConnection> {
   return inTauri() ? invoke<ImmichConnection>("plugin:wallpaper|get_immich_connection") : demoImmichConnection;
 }