Preset-selected two-region layout: video in the top-left, a resizable
side column, and an optional region below the video. Pages are assigned
to regions per preset (Location picker in the page editor); the layout
falls back to the stacked widescreen layout below 900pt width, so Split
View and narrow windows degrade automatically.
- CornerPlayerLayout hosts the shared playerAreaForWidescreen builder,
so the MPV hosting path is identical to the stacked layout
- Layout resolver in ExpandedPlayerSheet picks corner per layout pass;
NavigationCoordinator.isCornerLayoutActive feeds the macOS window
manager, which drops the aspect-ratio lock and auto-fit while corner
is active (and restores them on exit, incl. fullscreen replay and
window re-mounts)
- Side column width persisted via new cornerPanelColumnWidth setting
(280-560pt, video column kept >= 480pt)
- Settings: layout mode picker (iPad/macOS) with automatic-fallback
footer, per-page region picker when corner is on, region shown in
the pages list
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