Expand matched MusicBrainz release groups into concrete releases for specific album searches so import users can choose the correct edition by track count, format, country, and disambiguation. Preserve distinct MusicBrainz release IDs instead of deduping same-title variants, carry release metadata through import matching, and surface those details on album result cards. Add coverage for variant preservation and release-group expansion.
- Move import flow modules into a dedicated package
- Update app and test imports to the new namespace
- Group the import-focused tests under tests/imports
