fix(web): activate contextual help and filter status

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

@@ -93,6 +93,8 @@ test('starts without a selection and supports expand, collapse, reselection, and
   expect(screen.queryByRole('button', { name: '取消选择车辆' })).not.toBeInTheDocument();
   expect(screen.getByTestId('fleet-map')).toHaveAttribute('data-selected-vin', '');
   expect(screen.getByText('有实时位置')).toBeInTheDocument();
+  expect(screen.getByRole('status', { name: '搜索和筛选条件修改后自动生效' })).toHaveTextContent('实时筛选');
+  expect(screen.queryByRole('button', { name: '筛选' })).not.toBeInTheDocument();
   expect(screen.queryByText('接入车辆')).not.toBeInTheDocument();
 
   fireEvent.click(firstVehicle);

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

@@ -310,7 +310,7 @@ export default function MonitorPage() {
           {statuses.map((item) => <option key={item} value={item}>{item ? statusLabel(item as never) : '全部状态'}</option>)}
         </select>
         <button type="button" className="v2-secondary-button" onClick={() => { setKeyword(''); setProtocol(''); setStatus(''); setListOffset(0); }}><IconRefresh />清空</button>
-        <button type="button" className="v2-primary-button"><IconFilter />筛选</button>
+        <span className="v2-filter-live-status" role="status" title="搜索和筛选条件修改后自动生效"><IconFilter />实时筛选</span>
         <div className="v2-monitor-mode" aria-label="监控视图"><button type="button" className={mode === 'map' ? 'is-active' : ''} onClick={() => setMode('map')}><IconMapPin />地图</button><button type="button" className={mode === 'list' ? 'is-active' : ''} onClick={() => { setMode('list'); setDetailOpen(false); }}><IconList />列表</button></div>
         <button type="button" className="v2-monitor-mobile-entry" onClick={() => setMobileEntryOpen(true)}><IconQrCode />手机端</button>
       </section>