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.
The pill mode now lives on CommentsPageSettings and is edited in the
comments page editor instead of a standalone settings section. The
legacy value on PlayerPillSettings is kept for decoding old presets
and migrated by effectivePanelSettings. Comments are loaded when
either the comments page is enabled or the pill is not disabled.
