If a redirect is encountered, the Location header is extracted and treated as the direct download URL for the music file.
This aligns the code with the API behavior which redirects to the actual file location instead of returning a JSON response.
Add a new sync service and frontend integration to allow syncing
favorites across devices using a token.
- Configure `sync-service` in docker-compose.yml on port 7482
- Add sync token input and manual sync button to SideDrawer
- Implement auto-sync logic to persist favorites to the KV store
- Add logic to merge cloud favorites with local data on initialization
