Update src/app.py

src/app.py

@@ -327,7 +327,7 @@ def send_message(image, text,
 # =============================================================================
 def clear_chat():
     # Clear unified conversation, vision state, and internal text state.
-    return [], [], [], "", None
+    return [], [], [], [], "", None    
 
 # =============================================================================
 # UI Layout with Gradio