On iPad both orientations show the video next to a panel, the corner
layout hosts the portrait panel in landscape, and Split View windows make
"portrait" mean "narrow", so the portrait/landscape visibility split never
matched what the user saw. PillVisibility now treats any mode except Never
as visible on iPad, and the pill editor shows a Show pill toggle there
(writes Both/Never, reads synced orientation modes as on). iPhone keeps
the four-way picker.
ExpandedPlayerSheet's bottomPillsOverlay was unreferenced; the floating
panel renders its own pill row.