Fix Gradio 6.x Chatbot API: remove deprecated 'type' parameter

The 'type' parameter was removed in Gradio 6.x - messages format is now default.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

ui/tabs/results_tab.py

@@ -93,7 +93,7 @@ def create_tab() -> dict[str, Any]:
 
     chatbot = gr.Chatbot(
         label="Chat",
-        type="messages",  # Gradio 6 format: [{"role": "user", "content": "..."}, ...]
+        # type parameter removed in Gradio 6.x - messages format is default
         height=300,
         elem_id="chatbot",
     )