Fix Gradio 6.0 theme parameter compatibility

app.py

@@ -23,7 +23,7 @@ def run_simulation(manual_seed=None):
     except Exception as e:
         return f"Error running simulation: {str(e)}", None
 
-with gr.Blocks(theme=gr.themes.Soft()) as interface:
+with gr.Blocks() as interface:
     gr.Markdown("# 🚦 Smart Traffic Optimization Environment (OpenEnv)")
     gr.Markdown("Welcome to the Traffic Simulator. Watch how our AI improves traffic flow in real time.")
     
@@ -65,4 +65,4 @@ with gr.Blocks(theme=gr.themes.Soft()) as interface:
     run_btn.click(fn=run_simulation, inputs=[seed_input], outputs=[output_text, output_img])
 
 if __name__ == "__main__":
-    interface.launch(server_name="0.0.0.0", server_port=7860)
+    interface.launch(server_name="0.0.0.0", server_port=7860, theme=gr.themes.Soft())