style(web): close control-system gaps found in the deep sweep

apps/web/src/settings/connection-settings-panel.test.tsx

@@ -1,5 +1,5 @@
 // @vitest-environment jsdom
-import { cleanup, render, screen, within } from '@testing-library/react';
+import { cleanup, render, screen, waitFor, within } from '@testing-library/react';
 import userEvent from '@testing-library/user-event';
 import { afterEach, describe, expect, it, vi } from 'vitest';
 
@@ -28,6 +28,11 @@ async function mount(overrides: Partial<SystemMaintenanceDataSource> = {}) {
   const data = source(overrides);
   const view = render(<ConnectionSettingsPanel dataSource={data} />);
   const region = await screen.findByRole('region', { name: '连接设置' });
+  if (!overrides.connection) {
+    await waitFor(() => {
+      expect(within(region).getByLabelText('心跳间隔（秒）').value).toBe('30');
+    });
+  }
   return { ...view, data, region };
 }