Move css/theme to launch() per Gradio 6.0 API

app.py

@@ -171,7 +171,7 @@ def on_lang_change(language):
     return gr.Code(language=LANG_META[language]["code_lang"])
 
 
-with gr.Blocks(css=CSS, theme=THEME, title="LeetCode Multi-Language Coder Suite") as demo:
+with gr.Blocks(title="LeetCode Multi-Language Coder Suite") as demo:
     with gr.Column(elem_id="lc-header"):
         gr.Markdown("# LeetCode Multi-Language Coder Suite")
         gr.Markdown("Qwen2.5-Coder-7B · QDoRA fine-tuned per language · execution-verified training data")
@@ -230,4 +230,4 @@ with gr.Blocks(css=CSS, theme=THEME, title="LeetCode Multi-Language Coder Suite"
     language.change(on_lang_change, inputs=language, outputs=output)
     run.click(solve, inputs=[problem, tag, language], outputs=[output, status])
 
-demo.launch()
+demo.launch(css=CSS, theme=THEME)