Add Fresh Releases playlist from ListenBrainz

[kgrubb]

Summary

Adds a fresh-releases scheduled playlist. Explo pulls recent albums from artists you already listen to (ListenBrainz Fresh Releases), expands each release to tracks via MusicBrainz, then imports them through the normal download and playlist path.

Screenshot

Added

• fresh-releases playlist type (-p fresh-releases)
• Discovery from ListenBrainz Fresh Releases, with a top-artists fallback when the personalized feed is empty
• Schedule and UI wiring: FRESH_RELEASES_SCHEDULE / FRESH_RELEASES_FLAGS, Home card, Wizard option, manual run selector

Changed

• Prefetch treats fresh-releases like on-repeat (API-backed, not a troi created-for playlist)

Behavior

• Window: last 30 days
• Cap: up to 8 releases, full album tracklists
• Ranking preference: Album, then EP, then Single
• MusicBrainz lookups are paced (~1.1s between releases)

Personalized Fresh Releases can be empty for some accounts. When that happens, Explo matches sitewide fresh releases against the user's top artists for the past year.

Migration

None. Existing schedules are unchanged. Enable Fresh Releases from Home/Settings, or set:

FRESH_RELEASES_SCHEDULE=30 8 * * *
FRESH_RELEASES_FLAGS=--playlist fresh-releases