refactor: Update Gradio application theme to Default with blue and green hues for improved visual consistency and user experience.

app.py

@@ -403,7 +403,7 @@ with gr.Blocks(title="Streaming MLOps Agent") as demo:
 
 if __name__ == "__main__":
     demo.queue().launch(
-        theme=gr.themes.Soft(),
+        theme=gr.themes.Default(primary_hue="blue", secondary_hue="green"),
         allowed_paths=["/tmp"],
         ssr_mode=False,
         show_error=True,