iPhone has no page switcher: the portrait panel already rendered one info
page with chapters and related videos as collapsible inline sections. The
landscape floating panel now renders the same panel (no page bar, comments
stay on the pill/overlay), and the settings screen calls the list
"Sections" there, with the page bar labels toggle hidden.
The inline sections were hardcoded to chapters then related and ignored
the configured order, enablement, and thumbnail toggles. The info page now
receives the enabled section pages from PanelSettings.inlineSections(in:)
and renders them in list order with their own settings.
a81e618e74