Wires the fingerprint engine into the web Maintenance view.
- web.rs: a DedupState job (one at a time) on its own thread. POST
/api/maintenance/dedup/scan snapshots the library, mtime-gates against
stored fingerprints, fingerprints the new/changed videos in parallel
(progress counter), prunes vanished entries, groups by visual
similarity, and builds review rows (title/channel/size/files + a
recommended-keep = largest copy). GET /api/maintenance/dedup/status
polls progress + results. Deletion reuses /api/maintenance/remove.
- index.html: a "Similar content (perceptual)" section in the Maintenance
modal — Scan button, live progress bar, grouped results with
checkboxes (recommended-keep pre-unchecked), and a re-scan that drops
deleted copies. Poller self-cancels when the modal closes.
Integration test (ffmpeg-gated): generates orig + CRF-38 downscaled
re-encode + an unrelated clip, runs the real scan end-to-end, and asserts
the first two group while the third stays out. 118 tests pass.
Desktop Maintenance UI next.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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