fix(conversation): 离屏不丢回复、列表预热 WS 与非阻塞进入聊天

- 后端：文本/转写后 AI 生成改为独立任务，避免断连取消整轮；按需 TTS 等与 WS 改动
- 前端：RealtimeSession 重绑 UI 时恢复流式 buffer；列表 onPressIn/挂载预热、已有会话立即 push
- 同步会话相关类型、i18n、测试与 env/资源等累计改动

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

app-expo/tests/core/ws/client.test.ts

@@ -9,7 +9,7 @@ jest.mock('@/core/auth/token-manager', () => ({
 
 jest.mock('@/core/config', () => ({
   config: {
-    wsBaseUrl: 'ws://localhost:8000',
+    wsBaseUrl: 'ws://localhost:8000/',
     ws: {
       reconnectMaxRetries: 3,
       reconnectBaseDelayMs: 10,
@@ -23,6 +23,7 @@ jest.mock('@/core/config', () => ({
 class MockWebSocket {
   static OPEN = 1;
   static CLOSED = 3;
+  static instances: MockWebSocket[] = [];
 
   readyState = MockWebSocket.OPEN;
   onopen: (() => void) | null = null;
@@ -32,6 +33,7 @@ class MockWebSocket {
   sentMessages: string[] = [];
 
   constructor(public url: string) {
+    MockWebSocket.instances.push(this);
     setTimeout(() => this.onopen?.(), 0);
   }
 
@@ -53,6 +55,7 @@ class MockWebSocket {
 describe('WsClient', () => {
   afterEach(() => {
     jest.clearAllMocks();
+    MockWebSocket.instances = [];
   });
 
   test('connects with token and conversation id in URL', async () => {
@@ -66,6 +69,9 @@ describe('WsClient', () => {
 
     expect(states).toContain('connecting');
     expect(states).toContain('connected');
+    expect(MockWebSocket.instances[0]?.url).toBe(
+      'ws://localhost:8000/ws/conversation/conv-123?token=test-token',
+    );
 
     client.dispose();
   });
@@ -133,6 +139,27 @@ describe('WsClient', () => {
     client.dispose();
   });
 
+  test('sends text with tts_this_turn when requested', async () => {
+    const client = new WsClient('conv-123');
+
+    await client.connect();
+    await new Promise((r) => setTimeout(r, 10));
+
+    client.sendText('Hello', { ttsThisTurn: true });
+
+    const ws = (client as unknown as { ws: MockWebSocket }).ws;
+    expect(ws.sentMessages).toHaveLength(1);
+
+    const sent = JSON.parse(ws.sentMessages[0]);
+    expect(sent).toEqual({
+      type: 'text',
+      conversation_id: 'conv-123',
+      data: { text: 'Hello', tts_this_turn: true },
+    });
+
+    client.dispose();
+  });
+
   test('ignores unknown message types without crashing', async () => {
     const client = new WsClient('conv-123');
     const events: WsEvent[] = [];