This commit introduces several new features and improvements to Spotube:
- **DAB Music Integration:** Adds DAB Music as a new high-quality audio source, with support for searching, streaming, and downloading tracks.
- **Playback Quality Display:** Adds a UI element to the player to display the actual audio quality of the currently playing stream.
- **Performance Optimization:** Improves the startup and shutdown performance of the desktop application.
- **Dependency Fix:** Resolves a dependency conflict with `dio_retry` by implementing a custom retry interceptor.
