fix(file-summary): 修复报告导出下载

review_agent/file_summary/views.py

@@ -121,4 +121,14 @@ def export_download(request, export_id: int):
     path = Path(exported.storage_path)
     if not path.exists():
         return JsonResponse({"error": "文件不存在。"}, status=404)
-    return FileResponse(path.open("rb"), as_attachment=True, filename=exported.file_name)
+    content_type = (
+        "text/markdown; charset=utf-8"
+        if exported.export_type == ExportedSummaryFile.ExportType.MARKDOWN
+        else "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"
+    )
+    return FileResponse(
+        path.open("rb"),
+        as_attachment=True,
+        filename=exported.file_name,
+        content_type=content_type,
+    )