feat(wallpaper): extend commands with gallery, delete image, and crop

The plugin now exposes gallery retrieval, image deletion and image crop
across Android, desktop and mobile. The Rust core and Android
bridge are wired to handle these commands, updating state as needed.

- Add gallery, delete_image, and set_image_crop commands
- across Android, desktop and mobile.
- Update permissions, defaults, and schema to enable new commands.

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

@@ -17,12 +17,25 @@ import java.util.concurrent.Executors
 @InvokeArg
 class SettingArgs { lateinit var name: String; var value: Boolean = false }
 
+@InvokeArg
+class GalleryArgs { var offset: Int = 0; var limit: Int = 48 }
+
+@InvokeArg
+class DeleteImageArgs { lateinit var id: String }
+
 @TauriPlugin
 class WallpaperPlugin(private val activity: Activity) : Plugin(activity) {
   private val io = Executors.newSingleThreadExecutor()
 
   @Command fun getState(invoke: Invoke) = io.execute { invoke.resolve(WallpaperStore.state(activity)) }
 
+  @Command fun getGallery(invoke: Invoke) = io.execute {
+    try {
+      val args = invoke.parseArgs(GalleryArgs::class.java)
+      invoke.resolve(WallpaperStore.gallery(activity, args.offset, args.limit))
+    } catch (error: Exception) { invoke.reject(error.message ?: "Galerie konnte nicht geladen werden") }
+  }
+
   @Command fun selectImages(invoke: Invoke) {
     val intent = Intent(Intent.ACTION_OPEN_DOCUMENT).apply {
       addCategory(Intent.CATEGORY_OPENABLE)
@@ -33,6 +46,14 @@ class WallpaperPlugin(private val activity: Activity) : Plugin(activity) {
     startActivityForResult(invoke, intent, "selectedImages")
   }
 
+  @Command fun deleteImage(invoke: Invoke) = io.execute {
+    try {
+      val args = invoke.parseArgs(DeleteImageArgs::class.java)
+      if (!WallpaperStore.delete(activity, args.id)) throw IllegalArgumentException("Bild wurde nicht gefunden")
+      invoke.resolve(WallpaperStore.state(activity))
+    } catch (error: Exception) { invoke.reject(error.message ?: "Bild konnte nicht gelöscht werden") }
+  }
+
   @ActivityCallback
   fun selectedImages(invoke: Invoke, result: ActivityResult) {
     if (result.resultCode != Activity.RESULT_OK) { invoke.reject("Bildauswahl abgebrochen"); return }