feat: Add generated PNG assets
All button states (up, down, over, disabled):
- Play, pause, stop, prev, next
- Volume, mute, fullscreen, playlist
- Shuffle (on/off), repeat (on/off), repeat one (on/off)
- Window controls (close, minimize)
- Equalizer, A-B loop, speed
Sliders:
- Time slider track (440x8) and knob (20px)
- Volume slider track (80x6) and knob (18px)
Backgrounds:
- Main window (500x225) with superellipse corners
- Video window (640x480)
- Playlist window (320x400)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
9af3492fd5