perf(tracks): coalesce address lookups

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

@@ -74,3 +74,20 @@ test('renders a map-first replay workspace and connects stop, event, and panel i
   await waitFor(() => expect(client.getQueryCache().findAll({ queryKey: ['track-playback'] })).toHaveLength(0));
   await waitFor(() => expect(client.getQueryCache().findAll({ queryKey: ['track-address'] })).toHaveLength(0));
 });
+
+test('coalesces rapid track scrubbing into one address lookup for the final point', async () => {
+  const client = new QueryClient({ defaultOptions: { queries: { retry: false } } });
+  render(<QueryClientProvider client={client}><MemoryRouter future={ROUTER_FUTURE} initialEntries={['/tracks?keyword=LTEST000000000001&dateFrom=2026-07-15T00:00&dateTo=2026-07-15T23:59']}><TrackPage /></MemoryRouter></QueryClientProvider>);
+
+  expect((await screen.findAllByText('粤A12345')).length).toBeGreaterThan(0);
+  await waitFor(() => expect(mocks.reverseGeocode).toHaveBeenCalledTimes(1));
+
+  const progress = screen.getByRole('slider', { name: '轨迹播放进度' });
+  fireEvent.change(progress, { target: { value: '1' } });
+  fireEvent.change(progress, { target: { value: '2' } });
+
+  expect(screen.getByText('位置已变化，等待地址解析…')).toBeInTheDocument();
+  await waitFor(() => expect(mocks.reverseGeocode).toHaveBeenCalledTimes(2));
+  expect(mocks.reverseGeocode.mock.calls[1][0].get('longitude')).toBe('113.3000');
+  expect(mocks.reverseGeocode.mock.calls[1][0].get('latitude')).toBe('23.3000');
+});