修复导览与讲解位置预览逻辑

src/view-models/explainViewModels.ts

@@ -37,6 +37,7 @@ export interface ExplainDetailPageViewModel {
   subtitle?: string
   contentType: ExplainContentType
   coverImages: string[]
+  hallId?: string
   hallName?: string
   floorLabel?: string
   summary: string
@@ -144,6 +145,7 @@ export const toExplainDetailPageViewModel = (exhibit: MuseumExhibit): ExplainDet
     subtitle: buildSubtitle(exhibit),
     contentType: contentTypeFor(exhibit),
     coverImages: [exhibit.image || '/static/exhibit-placeholder.jpg'].filter(Boolean),
+    hallId: exhibit.hallId,
     hallName: exhibit.hallName,
     floorLabel: exhibit.floorLabel,
     summary: exhibit.guideText || exhibit.description || '该展项暂无讲解文稿。',