When queue mode was set to repeat one, the "Playing in N seconds"
countdown still appeared after a video ended, showing the next queued
video - then restarting the current one anyway. The video-end path
never consulted the queue mode; only playNext() did, after the
countdown had already run.
- PlayerService.backendDidFinishPlaying: restart immediately in repeat
one mode, regardless of queue contents, player visibility, background,
or PiP. This also fixes repeat one never looping with an empty queue.
- ExpandedPlayerSheet.isAutoPlayEnabled: false in repeat one mode, which
gates all countdown triggers (start on ended, overlay render, re-arm
on appear) on iOS/macOS.
- TVPlayerView.handleVideoEnded: early-return in repeat one mode so
tvOS shows neither the countdown nor the replay controls.
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