完善建筑外观切换与宿主页面适配

src/components/explain/ExplainHallSelect.vue

@@ -1,6 +1,6 @@
 <template>
   <view class="explain-hall-select" :class="{ 'host-navigation': shouldUseHostNavigation }">
-    <view v-if="!shouldUseHostNavigation" class="explain-page-header">
+    <view v-if="showInternalHeader" class="explain-page-header">
       <view class="header-back" @tap="handleBack">
         <text class="header-back-icon">‹</text>
         <text class="header-back-text">返回</text>
@@ -241,6 +241,7 @@ const hallPreviewMap: Record<string, string> = {
 
 const filteredHalls = computed(() => props.halls)
 const shouldUseHostNavigation = computed(() => isEmbeddedInWechatMiniProgram())
+const showInternalHeader = computed(() => !shouldUseHostNavigation.value)
 const headerTitle = computed(() => {
   if (props.stage === 'unit') return props.selectedHallName || '选择业务单元'
   if (props.stage === 'stop') return props.selectedBusinessUnitName || '选择讲解点'

src/components/map/ThreeMap.vue

@@ -5142,9 +5142,30 @@ const handleFloorChange = async (floorId: string) => {
 }
 
 const showOverview = async () => {
-  // 建筑外观不再作为手动切换入口；只在初始加载与缩放自动切换时展示。
   if (activeView.value === 'overview') {
     resetCamera()
+    return
+  }
+
+  const previousLoadToken = modelLoadVersion
+  try {
+    isLoading.value = true
+    loadError.value = false
+    clearMapSelection(false)
+    clearRoutePreview()
+    await loadOverview()
+  } catch (error) {
+    if (!isStaleModelLoadError(error)) {
+      console.error('建筑外观模型加载失败:', error)
+      loadError.value = true
+      setFriendlyModelLoadError()
+    }
+    throw error
+  } finally {
+    const requestWasSuperseded = modelLoadVersion > previousLoadToken + 1
+    if (!requestWasSuperseded) {
+      isLoading.value = false
+    }
   }
 }
 

src/components/navigation/GuideMapShell.vue

@@ -705,6 +705,18 @@ const handleZoomClick = (direction: 'in' | 'out') => {
   emit('toolClick', direction === 'in' ? '放大' : '缩小')
 }
 
+const handleShowOverview = async () => {
+  indoorRendererRef.value?.disableAutoSwitchTemporarily?.(10000)
+  loadingFloorId.value = ''
+  requestedFloorId.value = ''
+  requestedFloorLabel.value = ''
+  failedFloorId.value = ''
+  await indoorRendererRef.value?.showOverview?.()
+  emit('selectionClear')
+  emit('indoorViewChange', 'overview')
+  emit('layerModeChange', 'single')
+}
+
 const handleMoreTap = () => {
   emit('moreClick')
 }
@@ -766,7 +778,8 @@ const handleOutdoorMarkerClick = (markerId: string) => {
 defineExpose({
   clearRoute: () => {
     indoorRendererRef.value?.clearRoute?.()
-  }
+  },
+  showOverview: handleShowOverview
 })
 </script>