refine Semi UI mobile vehicle grants

vehicle-data-platform/apps/web/src/v2/pages/UsersPage.test.tsx

@@ -249,6 +249,8 @@ test('keeps granted vehicles primary and reveals mobile assignment tools on dema
   expect(screen.queryByRole('textbox', { name: '按车牌或 VIN 搜索' })).not.toBeInTheDocument();
   expect(screen.getAllByRole('button', { name: /^移除 / })).toHaveLength(4);
   expect(screen.getByText('第 1–4 条，共 5 辆')).toBeInTheDocument();
+  expect(document.querySelectorAll('.v2-assigned-vehicle-card.is-mobile-compact')).toHaveLength(4);
+  expect(document.querySelector('.v2-assigned-vehicle-interval')).toHaveAttribute('aria-label', '授权有效期：启用 2026-06-05 00:00；停用 持续有效');
   expect(document.querySelector('.v2-user-editor-last-login')).toHaveTextContent('最近登录');
 
   fireEvent.click(toggle);