fix export conversation functionality - use button with file component for proper downloads

app.py

@@ -582,36 +582,48 @@ def create_interface():
                         submit_btn = gr.Button("Send", variant="primary")
                         clear_btn = gr.Button("Clear")
                     
-                    # Export functionality
+                    # Export functionality  
                     with gr.Row():
-                        export_btn = gr.DownloadButton(
+                        # Use a regular Button for triggering export
+                        export_trigger_btn = gr.Button(
                             "📥 Export Conversation",
                             variant="secondary",
                             size="sm"
                         )
+                        # Hidden file component for actual download
+                        export_file = gr.File(
+                            visible=False,
+                            label="Download Export"
+                        )
                     
                     # Export handler
                     def prepare_export(chat_history):
                         if not chat_history:
+                            gr.Warning("No conversation history to export.")
                             return None
                         
-                        content = export_conversation_to_markdown(chat_history)
-                        
-                        # Create filename
-                        space_name_safe = re.sub(r'[^a-zA-Z0-9]+', '_', SPACE_NAME).lower()
-                        timestamp = datetime.now().strftime('%Y%m%d_%H%M%S')
-                        filename = f"{space_name_safe}_conversation_{timestamp}.md"
-                        
-                        # Save to temp file
-                        temp_path = Path(tempfile.gettempdir()) / filename
-                        temp_path.write_text(content, encoding='utf-8')
-                        
-                        return str(temp_path)
+                        try:
+                            content = export_conversation_to_markdown(chat_history)
+                            
+                            # Create filename
+                            space_name_safe = re.sub(r'[^a-zA-Z0-9]+', '_', SPACE_NAME).lower()
+                            timestamp = datetime.now().strftime('%Y%m%d_%H%M%S')
+                            filename = f"{space_name_safe}_conversation_{timestamp}.md"
+                            
+                            # Save to temp file
+                            temp_path = Path(tempfile.gettempdir()) / filename
+                            temp_path.write_text(content, encoding='utf-8')
+                            
+                            # Return the file path for download
+                            return gr.File(visible=True, value=str(temp_path))
+                        except Exception as e:
+                            gr.Error(f"Failed to export conversation: {str(e)}")
+                            return None
                     
-                    export_btn.click(
+                    export_trigger_btn.click(
                         prepare_export,
                         inputs=[chatbot],
-                        outputs=[export_btn]
+                        outputs=[export_file]
                     )
                     
                     # Examples section