team-spotube/spotube ? reverse-engineered prompt

Build me a cross platform music streaming app for desktop and mobile that feels fast and lightweight, with a clean modern interface.

It should let people connect different music sources through plugins, so the app can work with more than one service or custom source. I want playback controls to happen locally, synced lyrics while songs play, and a way to show track info and playlists with downloaded music metadata. Make it work well on Windows, macOS, Linux, Android, and iPhone if possible, and keep it open source friendly with no telemetry or user tracking.

Please make it look polished, support dark mode, and use the same codebase across platforms. If you need current implementation details or platform quirks, look up the latest docs online first and then build it in a practical way.