Might sound like a rube here, but: is agentic development really this good at novel UIs? The video shows a sort of cassette tape music player, and a fancy looking audio visualizer/equalizer thing. I'm well aware agents are very good at boilerplate UIs, but I wouldn't expect them to be able to one-shot novel, dynamic UI elements like this. I've had Claude attempt some SVG animations and the results were very crude. That was a year or so ago though. Are there established ways of letting agents iterate on UIs, i.e. having them visually verify the visual design and interactions?