Update app.py

app.py

@@ -101,10 +101,10 @@ def chat_ui(query, history, mode):
     """Handles the chat interaction for Analyzer, Debugger, and Developer modes."""
     api_key = load_api_key()
     if not api_key:
-        return "Error: OpenAI API key not set. Please set the API key in the Settings tab.", []
+        return [("Error", "OpenAI API key not set. Please set the API key in the Settings tab.")], []
 
     if not is_project_loaded():
-        return "Error: No project loaded. Please upload and process a ZIP file first.", []
+        return [("Error", "No project loaded. Please upload and process a ZIP file first.")], []
 
     # Initialize history if None
     if history is None: