fix: Bug - Voice states doesn't get cleared for all users on leave

Broadcast a cleared voice_state when voice-active sockets drop and reset mute/deafen flags on disconnect or reconnect so stale session state cannot leak to other clients.

Co-authored-by: Cursor <cursoragent@cursor.com>

server/src/websocket/handler.ts

@@ -134,6 +134,59 @@ function clearVoiceActiveForOderId(oderId: string, exceptConnectionId?: string):
   });
 }
 
+function readVoiceStateServerId(snapshot: Record<string, unknown> | undefined): string | undefined {
+  if (!snapshot) {
+    return undefined;
+  }
+
+  const nestedVoiceState = snapshot['voiceState'];
+
+  if (nestedVoiceState && typeof nestedVoiceState === 'object') {
+    const nestedServerId = readMessageId((nestedVoiceState as { serverId?: unknown }).serverId);
+
+    if (nestedServerId) {
+      return nestedServerId;
+    }
+  }
+
+  return readMessageId(snapshot['serverId']);
+}
+
+/** Broadcast a cleared voice_state when a voice-active socket disappears without a graceful leave. */
+export function finalizeVoiceDisconnectForConnection(connectionId: string): void {
+  const user = connectedUsers.get(connectionId);
+
+  if (!user?.authenticated || (!user.voiceActive && !user.voiceStateSnapshot)) {
+    return;
+  }
+
+  const serverId = readVoiceStateServerId(user.voiceStateSnapshot) ?? user.viewedServerId;
+
+  if (serverId && user.serverIds.has(serverId)) {
+    broadcastToServer(
+      serverId,
+      {
+        type: 'voice_state',
+        serverId,
+        oderId: user.oderId,
+        displayName: normalizeDisplayName(user.displayName),
+        voiceState: {
+          isConnected: false,
+          isMuted: false,
+          isDeafened: false,
+          isSpeaking: false
+        }
+      },
+      { excludeConnectionId: connectionId }
+    );
+  }
+
+  user.voiceActive = false;
+  user.voiceStateSnapshot = undefined;
+  connectedUsers.set(connectionId, user);
+  clearVoiceActiveForOderId(user.oderId, connectionId);
+}
+
 function sendVoiceStateSnapshotToConnection(user: ConnectedUser, snapshot: Record<string, unknown>): void {
   user.ws.send(JSON.stringify({
     type: 'voice_state',