Autsunset/VidBee_Flutter ? reverse-engineered prompt

Build me a modern Android video downloader app in Flutter that works like VidBee. I want to paste a link, have the app detect it automatically, parse the video or audio options, and let me download from lots of popular sites like YouTube, TikTok, Instagram, X, and Bilibili.

It should feel clean and easy to use, with Material 3 styling, dark and light mode, and simple progress tracking while downloads are running. Please include a saved download history, support for choosing quality and audio only downloads, and a settings area where I can change the save folder, language, and user agent. I also want a way to import cookies for sites that need login, using a WebView login flow if needed. If you need to check current docs or best practices, look them up online.

Make sure it feels polished, reliable, and ready to install on Android.