perf(web): reschedule route preloads after navigation

vehicle-data-platform/apps/web/src/v2/layout/AppShell.test.tsx

@@ -0,0 +1,43 @@
+import { cleanup, fireEvent, render, screen, waitFor } from '@testing-library/react';
+import { afterEach, expect, test, vi } from 'vitest';
+import { MemoryRouter, Route, Routes } from 'react-router-dom';
+import { ROUTER_FUTURE } from '../routing/routerConfig';
+
+const routing = vi.hoisted(() => ({
+  preloadRoute: vi.fn(async () => undefined),
+  scheduleIdleRoutePreloads: vi.fn(() => vi.fn()),
+  shouldPreloadRouteOnIntent: vi.fn(() => true)
+}));
+
+vi.mock('../routing/routeModules', () => routing);
+vi.mock('../auth/AuthGate', () => ({
+  usePlatformSession: () => ({ session: { name: 'test-user', role: 'viewer' }, logout: vi.fn() })
+}));
+
+import { AppShell } from './AppShell';
+
+afterEach(() => {
+  cleanup();
+  vi.clearAllMocks();
+});
+
+test('reschedules likely route preloads when the active module changes', async () => {
+  const firstCleanup = vi.fn();
+  const secondCleanup = vi.fn();
+  routing.scheduleIdleRoutePreloads
+    .mockReturnValueOnce(firstCleanup)
+    .mockReturnValueOnce(secondCleanup);
+
+  render(<MemoryRouter future={ROUTER_FUTURE} initialEntries={['/monitor']}>
+    <Routes><Route element={<AppShell />}><Route path="*" element={<span>页面内容</span>} /></Route></Routes>
+  </MemoryRouter>);
+
+  expect(routing.scheduleIdleRoutePreloads).toHaveBeenCalledWith({ activePathname: '/monitor' });
+  fireEvent.click(screen.getByRole('link', { name: '历史数据' }));
+
+  await waitFor(() => expect(routing.scheduleIdleRoutePreloads).toHaveBeenLastCalledWith({ activePathname: '/history' }));
+  expect(firstCleanup).toHaveBeenCalledTimes(1);
+
+  cleanup();
+  expect(secondCleanup).toHaveBeenCalledTimes(1);
+});

vehicle-data-platform/apps/web/src/v2/layout/AppShell.tsx

@@ -39,11 +39,11 @@ const pageNames: Record<string, string> = {
 
 export function AppShell() {
   const location = useLocation();
-  const [initialPathname] = useState(() => location.pathname);
   const section = location.pathname.split('/')[1] || 'monitor';
+  const activeRoutePath = `/${section}`;
   const { session, logout } = usePlatformSession();
   const roleLabel = { viewer: '只读', operator: '处置员', admin: '管理员' }[session.role];
-  useEffect(() => scheduleIdleRoutePreloads({ activePathname: initialPathname }), [initialPathname]);
+  useEffect(() => scheduleIdleRoutePreloads({ activePathname: activeRoutePath }), [activeRoutePath]);
 
   return (
     <div className="v2-shell">