fix: optimistic voice state so user appears in sidebar immediately

Previously, the voice channel sidebar only showed users after a server
round-trip (voice_state_update broadcast). After a deploy/reconnect,
this left the user invisible in the sidebar despite being connected.
Now joinVoiceChannel, leaveVoice, and the WS ready handler all
optimistically update voiceUsers for the local user immediately.

packages/web/src/hooks/useWebSocket.ts

@@ -172,6 +172,9 @@ function handleEvent(origin: string, event: ServerEvent): void {
             console.log('[WebSocket] Re-syncing voice status on reconnect:', { currentVoiceChannelId, origin, curMuted, curDeafened, curCamera, curScreen });
             wsSend({ type: 'voice_join', channelId: currentVoiceChannelId }, origin);
             wsSend({ type: 'voice_status', isMuted: curMuted, isDeafened: curDeafened, isCameraOn: curCamera, isScreenSharing: curScreen }, origin);
+            // Optimistic: immediately show self in voice channel sidebar
+            const myId = isHome ? event.user.id : useAuthStore.getState().user?.id;
+            if (myId) addVoiceUser(currentVoiceChannelId, myId);
           }
         }
       }

packages/web/src/stores/voiceStore.ts

@@ -3,6 +3,7 @@ import { persist, createJSONStorage } from 'zustand/middleware';
 import type { ParticipantInfo } from '../hooks/useLiveKit';
 import { AudioManager } from '../audio/AudioManager';
 import { useServerStore } from './serverStore';
+import { useAuthStore } from './authStore';
 
 export interface ScreenShareConfig {
   height: 1080 | 720 | 540;
@@ -291,7 +292,21 @@ export const useVoiceStore = create<VoiceState>()(
       },
 
       // Leave voice without wiping the voiceUsers map (so sidebar still shows others)
-      leaveVoice: () => set({
+      leaveVoice: () => {
+        const channelId = get().currentVoiceChannelId;
+        const myId = useAuthStore.getState().user?.id;
+
+        set((state) => {
+          // Optimistic: immediately remove self from the channel's voice users
+          const voiceUsers = (channelId && myId)
+            ? (() => {
+                const m = new Map(state.voiceUsers);
+                m.set(channelId, (m.get(channelId) ?? []).filter(id => id !== myId));
+                return m;
+              })()
+            : state.voiceUsers;
+
+          return {
             currentVoiceChannelId: null,
             isCameraOn: false,
             isScreenSharing: false,
@@ -307,7 +322,10 @@ export const useVoiceStore = create<VoiceState>()(
             streamVolumes: new Map(),
             streamMutes: new Map(),
             watchingStreams: new Set(),
-      }),
+            voiceUsers,
+          };
+        });
+      },
 
       reset: () => set({
         voiceUsers: new Map(),

packages/web/src/utils/voice.ts

@@ -1,4 +1,5 @@
 import { useVoiceStore } from '../stores/voiceStore';
+import { useAuthStore } from '../stores/authStore';
 import { getChannelOrigin } from '../stores/serverStore';
 import { wsSend } from '../hooks/useWebSocket';
 
@@ -9,9 +10,11 @@ import { wsSend } from '../hooks/useWebSocket';
  * broadcasts a leave event and the client cleans up stale voice state.
  */
 export function joinVoiceChannel(channelId: string): void {
-  const { currentVoiceChannelId, setCurrentVoiceChannel } = useVoiceStore.getState();
+  const { currentVoiceChannelId, setCurrentVoiceChannel, addVoiceUser, removeVoiceUser } = useVoiceStore.getState();
   if (currentVoiceChannelId === channelId) return;
 
+  const myId = useAuthStore.getState().user?.id;
+
   // Leave old instance if switching cross-origin
   if (currentVoiceChannelId) {
     const oldOrigin = getChannelOrigin(currentVoiceChannelId);
@@ -19,8 +22,12 @@ export function joinVoiceChannel(channelId: string): void {
     if (oldOrigin !== newOrigin) {
       wsSend({ type: 'voice_leave' }, oldOrigin);
     }
+    // Optimistic: immediately remove self from old channel
+    if (myId) removeVoiceUser(currentVoiceChannelId, myId);
   }
 
   setCurrentVoiceChannel(channelId);
   wsSend({ type: 'voice_join', channelId }, getChannelOrigin(channelId));
+  // Optimistic: immediately show self in new channel
+  if (myId) addVoiceUser(channelId, myId);
 }