修复楼层切换后无法返回建筑外观

tests/e2e/three-map-camera-stability.spec.ts

@@ -168,6 +168,21 @@ const showOverview = async (page: Page, testInfo: TestInfo, name: string) => {
   assertStableTransition(before, after)
 }
 
+const exitOverviewWithZoomControl = async (page: Page, testInfo: TestInfo, name: string) => {
+  const before = await getReport(page)
+  await screenshot(page, testInfo, `${name}-before`)
+
+  await page.getByText('−', { exact: true }).click()
+  await expect.poll(async () => (await getReport(page)).activeView, { timeout: 10_000 }).toBe('overview')
+
+  const after = await getReport(page)
+  await screenshot(page, testInfo, `${name}-after`)
+  expect(after.isCameraTweening).toBe(false)
+  expect(after.modelRoot, 'the overview model must stay committed').not.toBeNull()
+  expect(after.modelRoot!.maxError).toBeLessThan(1e-12)
+  expect(after.camera.distance).toBeGreaterThanOrEqual(before.camera.distance * 1.2)
+}
+
 const normalizeFloorKey = (value: string) => value.trim().toLowerCase().replace(/[^a-z0-9.-]/g, '')
 
 const resolveRequiredFloorId = (floors: FloorReport[], requested: string) => {
@@ -213,4 +228,8 @@ test('ordinary exterior and floor switches preserve the GLB_METER camera project
 
   await switchFloor(page, testInfo, l1Point5, 'exterior-l1point5')
   await showOverview(page, testInfo, 'l1point5-exterior')
+
+  await switchFloor(page, testInfo, l1, 'exterior-l1-auto-exit')
+  await switchFloor(page, testInfo, l2, 'l1-l2-auto-exit')
+  await exitOverviewWithZoomControl(page, testInfo, 'l2-exterior-auto-exit')
 })