Settings → Notifications → Manage Channels: wrap the tvOS NavigationLink
destination in TVSidebarDetailContainer(showsDismissButton: true) so the
no-subscriptions, error, and loading states all have a focusable Done.
Channels sidebar tab: lift the tvOS search field + View Options button
out of the loaded-channels branch and render it above every state. The
empty state previously had zero focusable elements, leaving the right
pane blank when swiping in from the sidebar.
cc109043b3