fix: screenshare rendering, voice panel layout, SW cache bust with git SHA

- 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

web/src/stores/voice.ts

@@ -20,6 +20,7 @@ export interface VoiceParticipant {
   isMuted: boolean;
   isSpeaking: boolean;
   hasVideo: boolean;
+  isScreenSharing: boolean;
 }
 
 export interface WhisperNotification {
@@ -66,12 +67,15 @@ interface VoiceState {
 function participantToVoice(p: Participant): VoiceParticipant {
   const micPub = p.getTrackPublication(Track.Source.Microphone);
   const camPub = p.getTrackPublication(Track.Source.Camera);
+  const screenPub = p.getTrackPublication(Track.Source.ScreenShare);
+  const screenAudioPub = p.getTrackPublication(Track.Source.ScreenShareAudio);
   return {
     identity: p.identity,
     username: p.name || p.identity,
     isMuted: micPub?.isMuted ?? true,
     isSpeaking: p.isSpeaking,
     hasVideo: !!(camPub && !camPub.isMuted),
+    isScreenSharing: !!(screenPub && !screenPub.isMuted) || !!(screenAudioPub && !screenAudioPub.isMuted),
   };
 }
 
@@ -367,8 +371,15 @@ export const useVoiceStore = create<VoiceState>((set, get) => ({
     if (!room) return;
 
     const newState = !get().isScreenSharing;
-    await room.localParticipant.setScreenShareEnabled(newState);
-    set({ isScreenSharing: newState });
+    try {
+      await room.localParticipant.setScreenShareEnabled(newState, { audio: true });
+      set({ isScreenSharing: newState });
+    } catch (err: any) {
+      // user cancelled the browser picker — not an error
+      if (err?.name === 'AbortError' || err?.message?.includes('cancel')) return;
+      console.error('[voice] screenshare toggle failed:', err);
+      set({ error: err instanceof Error ? err.message : 'Screen share failed' });
+    }
   },
 
   toggleNoiseSuppression: async () => {