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Page#redirect_target resolves the precedence and returns nil for a
destination that is restricted or has no head, so a page with a broken
target renders itself rather than linking nowhere. The banner partial will
call the same method, so the redirect and the link cannot drift.
One hop, no exceptions, checked in publish_draft! rather than as a
validation: two nodes publishing concurrently could each pass a save-time
check and still produce a chain. "Live" means heads only, a draft redirect
that has not published is not yet a link anyone can follow.
Node.search excludes redirecting pages. editor_search does not: an editor
looking for one searches by title, and only the body is worth hiding.
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