Refactor build_ui function to register model load event inside context for improved clarity

app.py

@@ -258,10 +258,10 @@ def build_ui():
         # Model load banner shown after interface loads (async)
         def _post_load():
             return "✅ Model interface ready. If this is the first run and model wasn't cached, initial generation may still warm up."
-        # 'every' parameter not supported in current Gradio version; remove it.
+        # Register load event inside context
         demo.load(_post_load, inputs=None, outputs=status_box)
 
-        return demo
+    return demo
 
 
 if __name__ == "__main__":