fix: preserve new chats created before history loading finishes

src/frontend/components/layout/AppLayout.test.tsx

@@ -8,6 +8,7 @@ import { createTestStore } from '../../test-utils/createTestStore';
 import { addChat } from '../../redux/slices/chats';
 import { setProjects } from '../../redux/slices/projects';
 import { AppLayout } from './AppLayout';
+import { HomePage } from '../../pages/HomePage';
 import { chatStorage } from '../../services/chatStorage';
 import { getAllThreadsByUserId } from '../../services/agent-rest';
 import { getProjects, getThreadsByProject } from '../../services/projects-api';
@@ -136,6 +137,31 @@ describe('AppLayout — project delete and chat count', () => {
     mocks.getThreadsByProject.mockResolvedValue([]);
   });
 
+  it('preserves a quick-prompt chat when startup history finishes after the click', async () => {
+    let resolveHistory!: (history: []) => void;
+    vi.mocked(getAllThreadsByUserId).mockReturnValueOnce(
+      new Promise((resolve) => { resolveHistory = resolve; }),
+    );
+    const store = createTestStore();
+    render(
+      <Provider store={store}>
+        <MemoryRouter>
+          <AppLayout><HomePage /></AppLayout>
+        </MemoryRouter>
+      </Provider>,
+    );
+
+    await userEvent.click(screen.getByRole('button', { name: 'Start chat: What can you do for me?' }));
+    const chatId = store.getState().chats.chats[0].id;
+
+    resolveHistory([]);
+
+    await waitFor(() => {
+      expect(store.getState().chats.threadsListHydrated).toBe(true);
+    });
+    expect(store.getState().chats.chats.map((chat) => chat.id)).toContain(chatId);
+  });
+
   it('does not wipe local chats when the project is already gone', async () => {
     const user = userEvent.setup();
     mocks.deleteProject.mockResolvedValue({

src/frontend/pages/HomePage.tsx

@@ -4,6 +4,7 @@ import { v4 as uuidv4 } from 'uuid';
 import { Send } from 'lucide-react';
 import { useAppDispatch } from '../redux/hooks';
 import { addChat, ChatItem } from '../redux/slices/chats';
+import { markChatAsClientCreated } from '../services/newChatTracker';
 
 function builtinQuickPrompts(): string[] {
   return [
@@ -35,6 +36,7 @@ export function HomePage() {
   const startChat = useCallback(
     (initialPrompt?: string) => {
       const newChatId = uuidv4();
+      markChatAsClientCreated(newChatId);
       const newChat: ChatItem = {
         id: newChatId,
         title: initialPrompt?.substring(0, 40) || 'New Chat',