Release v0.2.0 - LRCX Karaoke Mode

New Features:
- LRCX format support for karaoke-style lyrics with word-level timing
- Progressive fill effect that smoothly fills words from left to right
- Automatic file extension-based parser selection (.lrcx, .lrc, .srt)

Changes:
- Removed -l/--lyrics-file option (MPRIS-only mode)
- Simplified error messages to suggest --help
- Improved lyrics search in same directory as music file

Technical:
- New lrcx_parser.c/h for LRCX format parsing
- Cairo clipping-based progressive fill rendering
- Extended lyrics_line structure with word_segment support