The NavigationStack toolbar title never refreshes on month change on iOS 26
(4 approaches tried: principal Text, navigationTitle, @Observable store). The
title now renders as a normal inline Text in a top safe-area inset just below
the system glass toolbar — the same mechanism as the flat variant, which does
update. The system toolbar keeps the buttons + the real Liquid Glass look.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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