perf(web): bound speculative route warming

vehicle-data-platform/apps/web/src/v2/routing/RouteBoundary.test.tsx

@@ -1,6 +1,6 @@
 import { cleanup, fireEvent, render, screen } from '@testing-library/react';
 import { afterEach, describe, expect, it, vi } from 'vitest';
-import { useEffect, useState } from 'react';
+import { lazy, useEffect, useState } from 'react';
 import { MemoryRouter, useSearchParams } from 'react-router-dom';
 import { isRouteChunkError, RoutePage } from './RouteBoundary';
 import { ROUTER_FUTURE } from './routerConfig';
@@ -36,6 +36,14 @@ describe('route recovery boundary', () => {
     expect(screen.getByText(/旧标签页仍引用上一版本资源/)).toBeInTheDocument();
   });
 
+  it('keeps a meaningful content skeleton visible while a route chunk is pending', () => {
+    const PendingPage = lazy(() => new Promise<never>(() => undefined));
+    const { container } = render(<MemoryRouter future={ROUTER_FUTURE} initialEntries={['/access']}><RoutePage page={PendingPage} label="接入管理" /></MemoryRouter>);
+    expect(screen.getByRole('status')).toHaveTextContent('正在加载接入管理');
+    expect(screen.getByText('导航与筛选状态已保留')).toBeInTheDocument();
+    expect(container.querySelectorAll('.v2-page-skeleton > i')).toHaveLength(4);
+  });
+
   it('keeps page state mounted when only URL search parameters change', () => {
     let mounts = 0;
     function FilterablePage() {