fix:修复ecxel导出问题

electron/services/exportService.ts

@@ -2364,7 +2364,10 @@ class ExportService {
         const row = worksheet.getRow(currentRow)
         row.height = 24
 
-        const contentValue = this.formatPlainExportContent(
+        const mediaKey = `${msg.localType}_${msg.localId}`
+        const mediaItem = mediaCache.get(mediaKey)
+        const contentValue = mediaItem?.relativePath
+          || this.formatPlainExportContent(
             msg.content,
             msg.localType,
             options,