Both carried yet another copy of the collapsing detail header.
AlbumDetailHeader gains appBarTitle (selection-aware toolbar title) and a
leading override for the folder screen's close/back switch. The playlist
header adopts the album layout (bottom-anchored content, 0.85 gradient,
length-adaptive title size, scrim only when blurred) instead of its
drifted centered variant; motion-banner and pill-chip meta are preserved
through the slots.
zarzet
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