feat(monitor): preserve investigation context

vehicle-data-platform/apps/web/src/v2/shared/MonitorReturnBar.test.tsx

@@ -0,0 +1,19 @@
+import { render, screen } from '@testing-library/react';
+import { expect, test } from 'vitest';
+import { MemoryRouter } from 'react-router-dom';
+import { ROUTER_FUTURE } from '../routing/routerConfig';
+import { withMonitorReturn } from '../routing/monitorContext';
+import { MonitorReturnBar } from './MonitorReturnBar';
+
+test('shows a deterministic monitor return only for monitor-originated child routes', () => {
+  const child = withMonitorReturn('/history?vin=LTEST000000000001', '/monitor?selectedVin=LTEST000000000001&detail=collapsed&zoom=13&bounds=113.1%2C23%2C113.4%2C23.3');
+  const view = render(<MemoryRouter future={ROUTER_FUTURE} initialEntries={[child]}><MonitorReturnBar /></MemoryRouter>);
+
+  expect(screen.getByRole('link', { name: /返回全局监控/ })).toHaveAttribute('href', expect.stringContaining('/monitor?'));
+  expect(screen.getByText(/LTEST000000000001/)).toBeInTheDocument();
+  expect(screen.getByText(/Zoom 13 · 详情收起/)).toBeInTheDocument();
+
+  view.unmount();
+  render(<MemoryRouter future={ROUTER_FUTURE} initialEntries={['/history?vin=LTEST000000000001']}><MonitorReturnBar /></MemoryRouter>);
+  expect(screen.queryByRole('link', { name: /返回全局监控/ })).not.toBeInTheDocument();
+});

vehicle-data-platform/apps/web/src/v2/shared/MonitorReturnBar.tsx

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+import { IconArrowLeft, IconMapPin } from '@douyinfe/semi-icons';
+import { Link, useSearchParams } from 'react-router-dom';
+import { monitorReturnFromParams, parseMonitorRouteContext } from '../routing/monitorContext';
+
+export function MonitorReturnBar() {
+  const [searchParams] = useSearchParams();
+  const returnTo = monitorReturnFromParams(searchParams);
+  if (!returnTo) return null;
+  const context = parseMonitorRouteContext(new URL(returnTo, 'https://vehicle-platform.invalid').searchParams);
+  const scope = [
+    context.selectedVin || '',
+    context.keyword && context.keyword !== context.selectedVin ? context.keyword : '',
+    context.protocol,
+    context.status
+  ].filter(Boolean).join(' · ');
+  return <section className="v2-monitor-return" aria-label="全局监控返回上下文">
+    <Link to={returnTo} replace><IconArrowLeft />返回全局监控</Link>
+    <span><IconMapPin />{scope || '恢复离开前的地图与筛选状态'}</span>
+    <em>Zoom {context.viewport.zoom} · {context.detailOpen ? '详情展开' : context.selectedVin ? '详情收起' : '未选车辆'}</em>
+  </section>;
+}