Update app.py

fixed make_pdf tool call handling

app.py

@@ -361,8 +361,9 @@ async def chat(prompt_window, user_window, password, history, output_window,
 
             if item.type == 'tool_call_item':
                 raw = item.raw_item
-                if raw.name == 'make_pdf':
-                    pdf_id = raw.call_id
+                if raw.type == 'function_call' and raw.status == 'completed':
+                    if raw.name == 'make_pdf':
+                        pdf_id = raw.call_id
 
             if item.type == 'tool_call_output_item' and pdf_id:
                 raw_id = item.raw_item['call_id']