fix(voice): keep LiveKit TTS tracks alive

examples/livekit-gemini-hacker-starter/frontend/hooks/useDebug.ts

@@ -0,0 +1,27 @@
+import * as React from 'react';
+import { LogLevel, setLogLevel } from 'livekit-client';
+import { useRoomContext } from '@livekit/components-react';
+
+export const useDebugMode = (options: { logLevel?: LogLevel; enabled?: boolean } = {}) => {
+  const room = useRoomContext();
+  const logLevel = options.logLevel ?? 'debug';
+  const enabled = options.enabled ?? true;
+
+  React.useEffect(() => {
+    if (!enabled) {
+      setLogLevel('silent');
+      return;
+    }
+
+    setLogLevel(logLevel ?? 'debug');
+
+    // @ts-expect-error this is a global variable
+    window.__lk_room = room;
+
+    return () => {
+      // @ts-expect-error this is a global variable
+      window.__lk_room = undefined;
+      setLogLevel('silent');
+    };
+  }, [room, enabled, logLevel]);
+};