Fix chat visibility and conversation sync

tests/web/conversations-route.test.ts

@@ -6,12 +6,16 @@ import { createConversationsRouter } from '../../src/web/routes/conversations.js
 
 const servers: Array<ReturnType<express.Express['listen']>> = [];
 
-async function request(app: express.Express, path: string): Promise<Response> {
+async function request(
+  app: express.Express,
+  path: string,
+  init?: RequestInit,
+): Promise<Response> {
   const server = app.listen(0);
   servers.push(server);
   await new Promise<void>((resolve) => server.once('listening', resolve));
   const { port } = server.address() as AddressInfo;
-  return fetch(`http://127.0.0.1:${port}${path}`);
+  return fetch(`http://127.0.0.1:${port}${path}`, init);
 }
 
 afterEach(async () => {
@@ -177,4 +181,48 @@ describe('conversations route', () => {
     });
     expect(context.repos.messages.getLatestByRecipient).not.toHaveBeenCalled();
   });
+
+  it('waits for the conversation delta sync after sending a reply', async () => {
+    const conversation = {
+      username: 'alice', roomName: 'alice', roomId: 'room-alice',
+      url: 'https://chat.reddit.com/room/room-alice',
+      lastMessageTime: 10, lastMessageSnippet: 'Hello', isFromUs: false, unread: false,
+      messages: [{ sender: 'alice', text: 'Hello', timestamp: 10, isSelf: false }],
+    };
+    let completeSync: (() => void) | undefined;
+    const refreshTopChats = vi.fn(() => new Promise<void>((resolve) => {
+      completeSync = resolve;
+    }));
+    const context = {
+      logger: { error: vi.fn() },
+      activity: { push: vi.fn() },
+      broadcaster: { push: vi.fn() },
+      services: { chat: {
+        getCachedConversations: vi.fn().mockResolvedValue([conversation]),
+        sendChatMessage: vi.fn().mockResolvedValue(true),
+        refreshTopChats,
+      } },
+    } as unknown as WebContext;
+    const app = express()
+      .use(express.json())
+      .use('/api', createConversationsRouter(context));
+
+    let responseSettled = false;
+    const responsePromise = request(app, '/api/conversations/room-alice/send-reply', {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ message: 'AI-assisted reply' }),
+    }).then((response) => {
+      responseSettled = true;
+      return response;
+    });
+
+    await vi.waitFor(() => expect(refreshTopChats).toHaveBeenCalledWith(5));
+    expect(responseSettled).toBe(false);
+    completeSync?.();
+
+    const response = await responsePromise;
+    expect(response.status).toBe(200);
+    expect(await response.json()).toEqual({ success: true });
+  });
 });