feat(monitor): preserve investigation context

vehicle-data-platform/apps/web/src/v2/map/FleetMap.test.tsx

@@ -296,6 +296,29 @@ test('recovers in place after a transient AMap failure and renders data that arr
   expect(screen.queryByText(/地图加载失败/)).not.toBeInTheDocument();
 });
 
+test('restores the saved monitor viewport without forcing the selected vehicle zoom', async () => {
+  window.__LINGNIU_APP_CONFIG__ = { amapWebJsKey: 'amap-web-key' };
+  window.AMapLoader = { load: vi.fn(async () => amapMock()) };
+  const bounds = '113.100000,23.000000,113.400000,23.300000';
+
+  render(<FleetMap
+    vehicles={[]}
+    monitorMap={pointMap}
+    selectedVin="LTEST000000000001"
+    initialViewport={{ zoom: 13, bounds }}
+    onSelect={() => undefined}
+  />);
+
+  await waitFor(() => expect(mapOptions).toHaveLength(1));
+  expect(mapOptions[0]).toEqual(expect.objectContaining({
+    zoom: 13,
+    center: wgs84ToGcj02(113.25, 23.15)
+  }));
+  await waitFor(() => expect(markerSetMap).toHaveBeenCalled());
+  expect(setZoomAndCenter).not.toHaveBeenCalled();
+  expect(panTo).not.toHaveBeenCalled();
+});
+
 test('detaches AMap listeners and destroys the map on unmount', async () => {
   window.__LINGNIU_APP_CONFIG__ = { amapWebJsKey: 'amap-web-key' };
   window.AMapLoader = { load: vi.fn(async () => amapMock()) };