update app

app.py

@@ -230,14 +230,6 @@ def process_qwen(image: Image.Image, category: str, prompt: str):
         return json.dumps(objects_result, indent=2), objects_result
     return "Invalid category", {}
 
-def on_category_change(category):
-    """Update placeholder text when category changes."""
-    return gr.Textbox(
-        value="",
-        placeholder=PLACEHOLDERS.get(category, ""),
-        interactive=True,
-    )
-
 def process_inputs(image, category, prompt):
     if image is None:
         raise gr.Error("Please upload an image.")