fix(player): keep playing the current video when it leaves the live feed queue
Auto-marking a video watched near its end invalidates the feed query; the refetched/reordered queue can no longer contain the playing item, so findIndex returned -1 and the active item fell back to queue[0] — silently jumping playback to an unrelated video and defeating Loop "One" (and auto-advance:off). Pin the last resolved video in a ref and keep playing it when it drops out of the queue instead of snapping to queue[0].
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