- Move Close to a top-right circular icon; bottom row reorganizes into
left (Settings/Info/Comments), center transport (Previous/PlayPause/Next),
and right (Queue) clusters with equal side frames so transport stays
geometrically centered.
- Introduce a circular icon-only `TVTransportButtonStyle` (primary variant
for Play/Pause) mirroring the new Close button look.
- Always render Previous/Next so Play/Pause position is fixed; dim and
disable when unavailable.
- Share `isTransportDisabled` on `PlayerState` and reuse it on iOS and
tvOS; apply it (plus symbol replace transition) to the tvOS Play/Pause
button.
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