Refactor error handling in format_search_results function to return structured error messages

app.py

@@ -480,7 +480,8 @@ def format_search_results(abstract: str) -> tuple[pd.DataFrame, list[dict]]:
     except ValueError as e:
         error_message = str(e)
         df = pd.DataFrame(
-            [{"Title": error_message, "Authors": "", "Categories": "", "Date": "", "Match Score": ""}]
+            # [{"Title": error_message, "Authors": "", "Categories": "", "Date": "", "Match Score": ""}]
+            [{"Error": error_message}]
         )
         return df, []