On a deep scan the progress bar hits 100% when the last item is read, but the prune
(delete orphaned rows + cascades) runs AFTER that and — on a big cleanup — takes a
few seconds, during which the scan still reads as running (can't start a new one,
workers still paused). Looked stuck at 100%. Now the scanner sets a 'cleaning up
removed movies/shows' phase around the prune so the UI shows it's finalizing, not
frozen. Test spies the phase at prune time. 18 scanner tests pass.
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