Implement Android-specific features

Add Android-specific features not available on iOS.

Features:

1. Home Screen Widgets

   • Recent content widget
   • Quick actions widget

2. Quick Settings Tiles

   • Quick access to common features

3. Picture-in-Picture

   • Video playback in PiP mode

4. Share Sheet Integration

   • Share content to other apps
   • Receive content from other apps

5. Notification Channels

   • Granular notification settings

Tasks:

• Design and implement widgets
• Add PiP support for video player
• Implement share functionality
• Configure notification channels
• Add Quick Settings tiles
• Test on various Android versions