spotiflacapp/SpotiFLAC-Mobile ? reverse-engineered prompt

Build me a mobile app for managing and downloading music in high quality for a personal library. It should feel like a clean Flutter app on Android and iPhone, with a simple home screen, search, a library view, downloads, and a store area where users can add extension sources to get new music providers. I want users to be able to paste a track or playlist link, fetch the songs, and queue them for download, then choose where the files are saved and see progress clearly. Add a settings area for extension management, provider priority, and any download options needed. Please make it open source friendly, with no ads, no subscription, and a polished look that matches a real music app. If you need current docs or platform details, look them up online as you go.