Top Menu, Content, Footer — the layout IS a page, and those are the only three things on it. They were
reachable by scrolling and by knowing which tab held what; as rows they take the shape the nav already
teaches with the pages under Pages, and the open one is `band` in the query string.
Fixed rather than fetched, unlike pages. A band cannot be added or removed from the admin — only the
code that draws it can — so reading them from the database would be a query that can only ever return
the same three rows in the same order.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>