- Updated Release struct to include optional fields for artist credit, track count, and release group. - Introduced ReleaseGroup struct for better organization of release data. - Modified scrobble function to utilize MusicBrainzClient passed as a parameter, improving dependency management. - Implemented search_musicbrainz_recording function to streamline MusicBrainz recording searches and handle errors gracefully. - Enhanced caching mechanism for MusicBrainz responses to reduce redundant API calls. - Improved query construction for MusicBrainz searches to include status filtering. - Added tests for MusicBrainz client and release selection logic to ensure reliability. - Refactored artist credit handling in Track conversion for better safety and clarity. - Updated dependencies in Cargo.toml for improved functionality and testing capabilities.