fix: use ancestry slice for warning log, not meta.Parents

ancestry grows to len(meta.Parents)+1. The subsequent warning log
indexed meta.Parents[len(ancestry)-1], which is one past the end of
meta.Parents, causing an out-of-bounds panic. Use ancestry[len(ancestry)-1]
to always reference the last element of the actual slice being validated.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

page/page.go

@@ -72,7 +72,7 @@ func ResolvePage(
 			log.Warningf(
 				nil,
 				"page %q is not found ",
-				meta.Parents[len(ancestry)-1],
+				ancestry[len(ancestry)-1],
 			)
 		}