feat(platform): export dashboard snapshot

vehicle-data-platform/apps/web/src/test/App.test.tsx

@@ -1109,6 +1109,8 @@ test('dashboard copies highest priority quality issue notification text', async
     configurable: true,
     value: { writeText }
   });
+  const createObjectURL = vi.spyOn(URL, 'createObjectURL').mockReturnValue('blob:dashboard-snapshot');
+  const revokeObjectURL = vi.spyOn(URL, 'revokeObjectURL').mockImplementation(() => undefined);
   vi.spyOn(globalThis, 'fetch').mockImplementation(async (input) => {
     const path = String(input);
     if (path.includes('/api/ops/health')) {
@@ -1238,6 +1240,11 @@ test('dashboard copies highest priority quality issue notification text', async
   expect(writeText).toHaveBeenCalledWith(expect.stringContaining('历史RAW：http://localhost:3000/#/history-query?keyword=%E7%B2%A4A%E5%91%8A%E8%AD%A61&protocol=JT808&tab=raw&dateFrom=2026-07-03&dateTo=2026-07-04&includeFields=true'));
   expect(writeText).toHaveBeenCalledWith(expect.stringContaining('告警事件：http://localhost:3000/#/alert-events?issueType=VIN_MISSING'));
   expect(writeText).toHaveBeenCalledWith(expect.stringContaining('车辆服务：http://localhost:3000/#/detail?keyword=%E7%B2%A4A%E5%91%8A%E8%AD%A61&protocol=JT808'));
+
+  fireEvent.click(screen.getByRole('button', { name: '导出驾驶舱 CSV' }));
+
+  expect(createObjectURL).toHaveBeenCalled();
+  expect(revokeObjectURL).toHaveBeenCalledWith('blob:dashboard-snapshot');
 });
 
 test('dashboard keeps core vehicle service metrics when preview requests fail', async () => {