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setInterval does not await an async callback. Slicing a large project
blocks the backend for seconds, so poll ticks piled up behind one stalled
request, each holding a snapshot taken while the job was still active.
They resolved together, and every one of them ran the completion path —
one toast and two query invalidations each. A 20s stall against the 1.5s
interval produced 13 "Sliced X" toasts from a single slice.
Only one poll round is now in flight at a time, which also stops queueing
requests against a backend that is already saturated. Completion is
recorded once per job id, and a round still awaiting a response when the
effect tears down now returns instead of acting.