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Migrated to new Tab API (iOS 18+). The auto-scroll play button uses Tab(role: .search) with systemImage: "play.fill" — this gives the separated circular placement on the trailing side of the tab bar, identical to the Photos app search icon. Tapping the play icon: - Switches to Reader tab - Starts auto-scroll When playing: a Liquid Glass speed control capsule appears above the tab bar with [ - ] 1.00x [ + ] [ stop ]. Removed the old floating glass pill implementation. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>