update app

app.py

@@ -487,7 +487,7 @@ with gr.Blocks(theme=orange_red_theme, css=css) as demo:
                     "Qwen2.5-VL-3B-Instruct"
                 ],
                 label="Select Model",
-                value="Qwen2.5-VL-7B-Instruct"
+                value="Qwen3-VL-4B-Instruct"
             )
 
     # --- Event Handlers ---