BookLibraryView is itself pushed from PracticeView's NavigationStack,
so the .navigationDestination(for: Book.self) it declared was a
non-root registration. Combined with NavigationLink(value: book), that
resolved the push to *both* the destination handler and the closure
that produced BookLibraryView originally — pushing the chapter list
underneath, then re-pushing the library on top. Hitting back popped
the library and revealed the chapter list, in the wrong order.
Switched both Library→ChapterList and ChapterList→Reader to closure-
based NavigationLinks. Destinations attach directly to the link, no
type-keyed registry involved.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Trey T
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