fix(voice): keep LiveKit TTS tracks alive

examples/livekit-gemini-hacker-starter/frontend/components/agents-ui/agent-session-provider.tsx

@@ -0,0 +1,61 @@
+import { Room } from 'livekit-client';
+import {
+  RoomAudioRenderer,
+  type RoomAudioRendererProps,
+  SessionProvider,
+  type SessionProviderProps,
+  type UseSessionReturn,
+} from '@livekit/components-react';
+
+/**
+ * Props for the AgentSessionProvider component.
+ * Combines SessionProviderProps with RoomAudioRendererProps.
+ */
+export type AgentSessionProviderProps = SessionProviderProps &
+  RoomAudioRendererProps & {
+    /**
+     * The room to provide.
+     */
+    room?: Room;
+    /**
+     * The volume to set for the audio renderer.
+     */
+    volume?: number;
+    /**
+     * Whether to mute the audio renderer.
+     */
+    muted?: boolean;
+    /**
+     * The session to provide.
+     */
+    session: UseSessionReturn;
+    /**
+     * The children to render.
+     */
+    children: React.ReactNode;
+  };
+
+/**
+ * A provider component for agent sessions that wraps SessionProvider
+ * and includes RoomAudioRenderer for audio playback.
+ *
+ * @example
+ * ```tsx
+ * <AgentSessionProvider session={agentSession}>
+ *   <AgentControlBar />
+ *   <AgentChatTranscript />
+ * </AgentSessionProvider>
+ * ```
+ */
+export function AgentSessionProvider({
+  session,
+  children,
+  ...roomAudioRendererProps
+}: AgentSessionProviderProps) {
+  return (
+    <SessionProvider session={session}>
+      {children}
+      <RoomAudioRenderer {...roomAudioRendererProps} />
+    </SessionProvider>
+  );
+}