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/permissions/autogenerated/reference.md

@@ -5,7 +5,9 @@ Allow the LockScreenWallpaper app to manage its wallpaper collection
 #### This default permission set includes the following:
 
 - `allow-get-state`
+- `allow-get-gallery`
 - `allow-select-images`
+- `allow-delete-image`
 - `allow-set-setting`
 - `allow-next-wallpaper`
 
@@ -18,6 +20,58 @@ Allow the LockScreenWallpaper app to manage its wallpaper collection
 </tr>
 
 
+<tr>
+<td>
+
+`wallpaper:allow-delete-image`
+
+</td>
+<td>
+
+Enables the delete_image command without any pre-configured scope.
+
+</td>
+</tr>
+
+<tr>
+<td>
+
+`wallpaper:deny-delete-image`
+
+</td>
+<td>
+
+Denies the delete_image command without any pre-configured scope.
+
+</td>
+</tr>
+
+<tr>
+<td>
+
+`wallpaper:allow-get-gallery`
+
+</td>
+<td>
+
+Enables the get_gallery command without any pre-configured scope.
+
+</td>
+</tr>
+
+<tr>
+<td>
+
+`wallpaper:deny-get-gallery`
+
+</td>
+<td>
+
+Denies the get_gallery command without any pre-configured scope.
+
+</td>
+</tr>
+
 <tr>
 <td>