- shell switches to a NavigationRail at >=600dp (same destinations,
badges included); the bottom bar and its blur stay phone-only while
the mini player remains anchored bottom in both modes
- now-playing gains a two-pane landscape layout (artwork left,
metadata/controls right) built from the same widget pieces
- track lists on album/playlist/library-folder screens and search
result sections center at 720dp via wideListInset instead of
stretching across the full tablet width; explore carousels stay
full-bleed intentionally
