feat(profile): add data storage settings screen with cache management

Add DataStorageScreen for managing media cache and storage:
- Display cache statistics (image/video/audio counts and sizes)
- Show AsyncStorage usage information
- Add clear all cache functionality
- Add cleanup expired cache option (7 days threshold)
- Add storage usage breakdown by category
- Add "Last cleaned" timestamp display

Also fix MediaCacheManager to skip native cache operations on web platform:
- Return original URI directly on web without caching
- Skip directory creation on web
- Skip file existence checks on web
- Skip startup and periodic cleanup on web

src/navigation/hrefs.ts

@@ -206,3 +206,7 @@ export function hrefVerificationForm(identity?: string): string {
   }
   return '/verification-form';
 }
+
+export function hrefProfileDataStorage(): string {
+  return '/profile/data-storage';
+}