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/android/src/main/java/WallpaperPlugin.kt

@@ -28,6 +28,9 @@ class GalleryArgs { var offset: Int = 0; var limit: Int = 48 }
 @InvokeArg
 class DeleteImageArgs { lateinit var id: String }
 
+@InvokeArg
+class ApplyWallpaperArgs { lateinit var id: String }
+
 @InvokeArg
 class DeleteImagesArgs { var ids: Array<String> = emptyArray() }
 
@@ -130,7 +133,7 @@ class WallpaperPlugin(private val activity: Activity) : Plugin(activity) {
     try {
       val args = invoke.parseArgs(SettingArgs::class.java)
       WallpaperStore.set(activity, args.name, args.value)
-      invoke.resolve(WallpaperStore.state(activity, includePreviews = false))
+      invoke.resolve(WallpaperStore.state(activity))
     } catch (error: Exception) { invoke.reject(error.message ?: "Einstellung konnte nicht gespeichert werden") }
   }
 
@@ -139,7 +142,7 @@ class WallpaperPlugin(private val activity: Activity) : Plugin(activity) {
       val args = invoke.parseArgs(IntervalArgs::class.java)
       WallpaperStore.setInterval(activity, args.minutes)
       if (args.minutes > 0) WallpaperRotationService.restart(activity) else WallpaperRotationService.stop(activity)
-      invoke.resolve(WallpaperStore.state(activity, includePreviews = false))
+      invoke.resolve(WallpaperStore.state(activity))
     } catch (error: Exception) { invoke.reject(error.message ?: "Wechselintervall konnte nicht gespeichert werden") }
   }
 
@@ -150,6 +153,14 @@ class WallpaperPlugin(private val activity: Activity) : Plugin(activity) {
     } catch (error: Exception) { invoke.reject(error.message ?: "Das Hintergrundbild konnte nicht geändert werden") }
   }
 
+  @Command fun applyWallpaper(invoke: Invoke) = io.execute {
+    try {
+      val args = invoke.parseArgs(ApplyWallpaperArgs::class.java)
+      if (WallpaperStore.apply(activity, args.id)) invoke.resolve(WallpaperStore.state(activity))
+      else invoke.reject("Bild konnte nicht angewendet werden")
+    } catch (error: Exception) { invoke.reject(error.message ?: "Das Hintergrundbild konnte nicht geändert werden") }
+  }
+
   @Command fun getImmichConnection(invoke: Invoke) = io.execute {
     invoke.resolve(ImmichClient.connection(activity))
   }