Move the channel-link button and View Options into a top safe-area inset
on tvOS so they are reachable with the remote, mirroring the Continue
Watching pattern. Wrap chrome and content in focus sections with a
default-focus namespace so initial focus lands on the first video. Hide
the duplicate in-content section header on tvOS, and add
scrollClipDisabled to VideoListContainer so focus scaling on rows is
not clipped at the scroll edges.