fix(gradio6): drop theme + removed btn args

app.py

@@ -143,10 +143,8 @@ FOOTER_MD = """
 <sub>Powered by <a href="https://quicksilverpro.io">QuickSilver Pro</a> — open-source LLM inference, OpenAI-compatible, ~20% below OpenRouter / Together / Fireworks. Built by <a href="https://quicksilverpro.io">MachineFi Labs</a>.</sub>
 """
 
-with gr.Blocks(
-    title="QuickSilver Pro Chat",
-    theme=gr.themes.Soft(primary_hue="indigo", secondary_hue="purple"),
-) as demo:
+# theme moved to launch() in Gradio 6, dropped here to stay forward-compatible
+with gr.Blocks(title="QuickSilver Pro Chat") as demo:
     gr.Markdown(HEADER_MD)
 
     with gr.Row():
@@ -170,6 +168,9 @@ with gr.Blocks(
                 label="Max tokens", minimum=64, maximum=4096, step=64, value=1024
             )
         with gr.Column(scale=3):
+            # Gradio 6.0 removed submit_btn / retry_btn / undo_btn / clear_btn args
+            # in favor of a more opinionated default layout; dropping them keeps
+            # this compatible with both 5.x and 6.x.
             gr.ChatInterface(
                 fn=respond,
                 additional_inputs=[model_dropdown, system_prompt, temperature, max_tokens],
@@ -180,10 +181,6 @@ with gr.Blocks(
                     ["Translate 'Hello, how are you?' into formal Japanese, Hindi, and Russian"],
                 ],
                 cache_examples=False,
-                submit_btn="Send",
-                retry_btn="Retry",
-                undo_btn="Undo",
-                clear_btn="Clear",
             )
 
     gr.Markdown(FOOTER_MD)