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
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