sb2702/free-ai-video-upscaler ? reverse-engineered prompt

Build me a simple web app that lets people upscale a video right in the browser with AI style enhancement, something like Anime4K.

I want it to feel very easy to use, no signups, no account, no server side upload flow, just pick a video, let it process locally in the browser, then download the finished upscaled video when it is done. Keep the interface clean and no nonsense, with clear progress while it is working and a straightforward result screen.

It should support common video input, do the enhancement smoothly if possible, and be fast enough to feel like a practical free tool. Please make it look polished and modern, and if you need to look up current browser video and web graphics docs online, go ahead.