- Add preview mode (p key) to toggle between send/preview behavior
- Arrow keys for navigation with optional send
- Enter sends current chord (only when not in preview mode)
- Jump to chord by number + Enter
- k/K keys for kill soft (15.0) and kill hard (0.0) commands
- Display prev/current/next chords with frequencies to 2 decimals
- Add OSC test receiver for debugging
- Use arrow key escape sequences for left/right navigation
