The Release component's scrobble interface has several usability gaps that make scrobbling cumbersome, especially for multi-medium releases. This task improves the experience across three areas: custom scrobble time, button visual clarity, and per-medium scrobble access.
Acceptance Criteria
#1 Users can set a custom finished_at datetime before scrobbling, defaulting to the current time when not set
#2 Scrobble buttons have sufficient contrast in both their enabled and disabled states so users can clearly distinguish between the two
#3 Enable scrobbling of selected tracks from the closest scrabble button (i.e. the medium button) instead of always having to scrobble to the top one.