imputnet/cobalt ? reverse-engineered prompt

I want to build a media downloader website. The main idea is to make it super simple and user-friendly, the complete opposite of all the spammy, ad-filled downloader sites out there. It should have a clean, minimal homepage with just a text box where someone can paste a URL.

It should support downloading videos and audio from major platforms like YouTube, TikTok, Twitter, Instagram, and Reddit. When a user pastes a link, the site should process it and just give them a direct download button for the file.

The most important thing is the user experience: absolutely no ads, no trackers, no pop-ups, and no paywalls. It's just an honest, straightforward tool to help people save public content they like. Please build it as a modern web app, probably with a Svelte frontend and a backend API that does the heavy lifting of fetching the media from the different sources.