- Add new `pick` audio clips for each opponent in `opponents.json` and corresponding MP3 files
- Implement a spectrum visualizer overlay for opponent portraits that activates during pick speech playback
- Integrate `SpeechQueue` to handle opponent pick audio with start/stop callbacks for the visualizer
- Add `setMenuMusicVolume` utility and adjust menu music volume during opponent selection
- Prevent speech/visualizer triggers during initial scene load and game start sequences
