fix: move theme= back to Blocks() (Gradio 4 API)

app.py

@@ -212,7 +212,7 @@ def cast_demo(messy_text: str, shape_json: str):
 
 # ---------- UI ----------------------------------------------------------------
 
-with gr.Blocks(title="The Agent Reliability Stack — Live Demo") as demo:
+with gr.Blocks(title="The Agent Reliability Stack — Live Demo", theme=gr.themes.Soft()) as demo:
     gr.Markdown(
         """
         # The Agent Reliability Stack — Live Demo
@@ -290,4 +290,4 @@ with gr.Blocks(title="The Agent Reliability Stack — Live Demo") as demo:
     )
 
 if __name__ == "__main__":
-    demo.launch(theme=gr.themes.Soft())
+    demo.launch()