feat(wallpapers): add image crop support and i18n strings

Adds per-image image-crop support with persistent settings.
Rendering adapts to crop mode, zoom and position per image.
Locales the UI strings and notifications; app name updated.

- Cropping workflow with per-image crop state and rendering
- Localizes strings and notifications for en and de
- Introduces set_image_crop command and its permission schema

plugins/permissions/autogenerated/reference.md

@@ -8,6 +8,7 @@ Allow the LockScreenWallpaper app to manage its wallpaper collection
 - `allow-get-gallery`
 - `allow-select-images`
 - `allow-delete-image`
+- `allow-set-image-crop`
 - `allow-set-setting`
 - `allow-next-wallpaper`
 
@@ -153,6 +154,32 @@ Denies the select_images command without any pre-configured scope.
 <tr>
 <td>
 
+`wallpaper:allow-set-image-crop`
+
+</td>
+<td>
+
+Enables the set_image_crop command without any pre-configured scope.
+
+</td>
+</tr>
+
+<tr>
+<td>
+
+`wallpaper:deny-set-image-crop`
+
+</td>
+<td>
+
+Denies the set_image_crop command without any pre-configured scope.
+
+</td>
+</tr>
+
+<tr>
+<td>
+
 `wallpaper:allow-set-setting`
 
 </td>