feat: voice status visibility + sidebar persistence fixes

- Add WebSocket voice_status/voice_status_update events so mute/deafen
  icons are visible in the sidebar without joining the voice channel
- Server tracks voiceUserStates and includes them in the ready payload
- Re-register voice channel on WebSocket reconnect to prevent sidebar
  users from disappearing after idle timeout
- Re-broadcast deafen state to late joiners via LiveKit data channel
- Fix black grid tile when video stops (enabled-flag guards)
- Remove duplicate mute/deafen from VoiceControls (replaced with
  Video Quality + Noise Suppression)
- Fix missing users in sidebar voice list (identity matching + fallback)

packages/server/src/ws/events.ts

@@ -156,6 +156,9 @@ export function handleClientEvent(
     case 'dm_call_end':
       handleDmCallEnd(event, userId);
       break;
+    case 'voice_status':
+      handleVoiceStatus(event, userId);
+      break;
     default:
       connectionManager.sendToUser(userId, {
         type: 'error',
@@ -738,6 +741,27 @@ function handleChannelAck(event: Record<string, unknown>, userId: string): void
   });
 }
 
+function handleVoiceStatus(event: Record<string, unknown>, userId: string): void {
+  const isMuted = event.isMuted === true;
+  const isDeafened = event.isDeafened === true;
+
+  const channelId = connectionManager.getUserVoiceChannel(userId);
+  if (!channelId) return;
+
+  const serverId = getChannelServerId(channelId);
+  if (!serverId) return;
+
+  connectionManager.setVoiceUserStatus(userId, isMuted, isDeafened);
+
+  connectionManager.sendToServer(serverId, {
+    type: 'voice_status_update',
+    userId,
+    channelId,
+    isMuted,
+    isDeafened,
+  });
+}
+
 // ─── DM Call Handlers ──────────────────────────────────────────────────────────
 
 function handleDmCallStart(event: Record<string, unknown>, userId: string, username: string): void {