- Center video player in full-screen mode (like album art)
- Add Plyr video player with proper sync and cleanup
- Improve lyrics functionality with multiple API sources (lyrics.ovh, LRCLIB, SimpMusic, ZingMP3)
- Add Vietnamese language detection for lyrics
- Add helpful links to ZingMP3/NhacCuaTui when lyrics not found
- Mobile UI improvements (gaps, settings panel removal, centered cover)
- Add origin parameter to YouTube embed for better security
- Fix TypeScript errors and improve code quality
