The audio-playlist play flow, the playlist download flow (including its inline MediaItem synthesis), the delete-with-confirm flow, and the fetch-artist-then-navigate flow each existed twice — once in MediaContextMenu and once in the playlist/album/now-playing screens, with 'Match PlaylistDetailScreen' comments standing in for shared code. They now live in music_navigation.dart and download_utils.dart with per-caller strings preserved; the menu's collection/playlist download handlers fold into one parameterized handler, its duplicated sync/download menu tree is built once, and the generic picker dialogs move to collection_picker_dialog.dart (pure move).
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