feat(wallpaper-store): enhance previews, EXIF handling, and shuffle

These changes add image previews and robust image handling across platforms.
Android, desktop, and TS UI now share imagePreviews data and a
persistent shuffle queue, improving ordering and previews.
EXIF orientation is applied when decoding images and rendering crops.
Manifest and rendering paths were adjusted for portrait mode.

- Introduce imagePreviews in models and UI to show per-image crop data.
- Implement EXIF orientation handling and enhanced cropping.
- Improve shuffle with persistent queue and seen-tracking.

src-tauri/gen/android/app/src/main/AndroidManifest.xml

@@ -15,6 +15,7 @@
             android:launchMode="singleTask"
             android:label="@string/main_activity_title"
             android:name=".MainActivity"
+            android:screenOrientation="portrait"
             android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />