- VideoGrid: add screen share track display with proper sizing
- participantToVoice: detect ScreenShare + ScreenShareAudio tracks
- VoicePanel: flex layout, no scroll, tiles dynamically fill space
- VoiceChannel: show screen/camera icons in participant list
- vite.config: inject git SHA into SW CACHE_VERSION on build
- New VideoGrid component: live camera feeds (local + remote) in VoicePanel
- Camera toggle in VoiceControls: enable/disable video per participant
- Noise suppression toggle in VoiceControls + voice store
- VOICE_WHISPER WS event: backend routes whisper to target user only
- Whisper UI: per-participant whisper button, notification toasts with dismiss
- Fix circular import between voice.ts and ws.ts (use lazy accessor)