When focus drifts to the player's screen-level Focus node (after an
overlay sheet closes with the controls hidden), a hardware play/pause
key only revealed the chrome and leaked to Android's MediaSession,
which pauses unreliably when its state is throttled or suspended.
Intercept media play/pause at the screen node on TV-style navigation:
toggle via the same playback-intent path as the Apple TV bridge and
consume the event.
close#1375
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