test(mobile): 新增 App 冒烟测试——Mobile 首测 2 passed

vite.config 新增 test.jsdom 环境配置，新增 @testing-library 依赖。

Author: DeliciousBuding

app/mobile/src/__tests__/App.test.tsx

@@ -0,0 +1,39 @@
+import { describe, it, expect, vi } from 'vitest';
+import { render, screen } from '@testing-library/react';
+import '@testing-library/jest-dom/vitest';
+import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
+import { App } from '../App';
+
+Element.prototype.scrollIntoView = vi.fn();
+
+vi.mock('../native/mobileCommands', () => ({
+  signIn: vi.fn(),
+  checkSession: vi.fn(),
+  clearSession: vi.fn(),
+  testAlert: vi.fn(),
+}));
+
+vi.mock('../native/hubHealth', () => ({
+  checkHubHealth: vi.fn(() => Promise.resolve({ reachable: true })),
+}));
+
+function renderWithProviders(ui: React.ReactElement) {
+  const queryClient = new QueryClient({
+    defaultOptions: { queries: { retry: false } },
+  });
+  return render(
+    <QueryClientProvider client={queryClient}>{ui}</QueryClientProvider>,
+  );
+}
+
+describe('Mobile App', () => {
+  it('renders the bottom navigation bar', () => {
+    renderWithProviders(<App />);
+    expect(screen.getByText('Threads')).toBeInTheDocument();
+  });
+
+  it('starts on the threads view', () => {
+    renderWithProviders(<App />);
+    expect(screen.getByText('Threads')).toBeInTheDocument();
+  });
+});