perf(tracks): defer empty map runtime

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

@@ -98,6 +98,68 @@ afterEach(() => {
   mapInstances.length = 0;
 });
 
+test('defers the map runtime until valid track data exists and releases it when data is cleared', async () => {
+  window.__LINGNIU_APP_CONFIG__ = { amapWebJsKey: 'amap-web-key' };
+  const load = vi.fn(async () => amapMock());
+  window.AMapLoader = { load };
+  const view = render(<TrackMap
+    points={[]}
+    stops={[]}
+    activeIndex={0}
+    showStops={false}
+    follow
+    onSelectIndex={() => undefined}
+    onFollowChange={() => undefined}
+  />);
+
+  expect(load).not.toHaveBeenCalled();
+  expect(mapInstances).toHaveLength(0);
+  expect(view.container.querySelector('.v2-map-state')).not.toBeInTheDocument();
+
+  view.rerender(<TrackMap
+    points={points}
+    stops={[]}
+    activeIndex={0}
+    showStops={false}
+    follow
+    onSelectIndex={() => undefined}
+    onFollowChange={() => undefined}
+  />);
+  await waitFor(() => expect(mapInstances).toHaveLength(1));
+  expect(load).toHaveBeenCalledTimes(1);
+
+  view.rerender(<TrackMap
+    points={[]}
+    stops={[]}
+    activeIndex={0}
+    showStops={false}
+    follow
+    onSelectIndex={() => undefined}
+    onFollowChange={() => undefined}
+  />);
+  await waitFor(() => expect(mapDestroy).toHaveBeenCalledTimes(1));
+  expect(mapInstances).toHaveLength(1);
+});
+
+test('does not initialize the map for rows without a valid coordinate', () => {
+  window.__LINGNIU_APP_CONFIG__ = { amapWebJsKey: 'amap-web-key' };
+  const load = vi.fn(async () => amapMock());
+  window.AMapLoader = { load };
+  render(<TrackMap
+    points={[{ ...points[0], longitude: 0, latitude: 0 }]}
+    stops={[]}
+    activeIndex={0}
+    showStops={false}
+    follow
+    onSelectIndex={() => undefined}
+    onFollowChange={() => undefined}
+  />);
+
+  expect(load).not.toHaveBeenCalled();
+  expect(mapInstances).toHaveLength(0);
+  expect(document.body).toHaveTextContent('当前轨迹没有可展示的有效坐标');
+});
+
 test('uses the playback cadence for follow animation and advances the passed path', async () => {
   window.__LINGNIU_APP_CONFIG__ = { amapWebJsKey: 'amap-web-key' };
   window.AMapLoader = { load: vi.fn(async () => amapMock()) };