Replace the separate top nav bar and TTS player bar with a single compact
sticky header that stays visible while scrolling. Navigation (← back, Prev,
Next) and the Listen/Pause button are always accessible. Voice, speed and
auto-next settings are moved into a ⚙ dropdown that opens from the header,
keeping the reading area clean. A thin status strip below the toolbar shows
Buffering/Playing/Error states only when active.
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