Improve accessibility annotations across views

[satsdisco]

Polish

QueueView and SearchView have good VoiceOver labels and traits, but several views are lighter on accessibility:

• NowPlayingView — artwork, progress bar, and secondary actions lack accessibility labels
• LibraryView — grid/list items missing VoiceOver descriptions
• AlbumDetailView — track rows, action buttons, and artwork upload need labels
• MiniPlayerView — has basic labels but missing hints for gestures (swipe to collapse)
• FavoritesView — filter pills and section headers need annotations

Should do a VoiceOver pass to ensure the app is usable for accessibility users.