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austinried
e6386ebddd
Review found that removing the playing context track while shuffled with a
non-empty up-next block stranded the block behind the cursor: the
repository moves `upNextAnchor` to the preceding track, but the cursor's
re-derived slot position can land after the block, so the queued tracks
were skipped. Re-anchor the block to the track the cursor lands on, same
as `playAt`/`toggleShuffle`.
- regression test loops the sequence over fresh random seeds and asserts
the block stays reachable; fails without the fix ("stranded behind the
cursor").
- `removingTheCurrentTrackWhileShuffled...` now asserts the canonical slot
the current track occupies instead of recomputing the production position
formula (which only checked the implementation against itself).
- `QueueRepository.removeAt` returns Unit; every caller discarded the
snapshot and re-read it, so it no longer builds one.