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Phase 1 of the on-boarding plan, and the shared layer for unified grid loading. A video that exists as both a bitvid kind-30078 note and a NIP-71 mirror/original previously could appear twice (e.g. independent dual-posts). js/utils/videoDeduper.js: collapseCrossEcosystem() groups events by a per-author identity (fileSha256 / originalFileSha256 / infoHash, plus an `eid` namespace that links an on-boarded note's `importedFrom` to the original foreign event) via union-find, and keeps the bitvid-native version (else newest). dedupeVideos() = root-dedup THEN cross-ecosystem collapse. Routed through the shared chokepoint app.dedupeVideosByRoot (playback coordinator), so the feed stage, channel profile, and search all collapse duplicates identically — "show one, prefer bitvid" everywhere. Channel fallback path updated too. Limitation (documented): hash-less independent dual-posts can't be matched until the bitvid side carries on-board provenance (Phase 2). Tests + mutation-verified (prefer-bitvid, per-author identity, infohash, provenance link, root+cross composition). 1262/1263 unit (known flake). Co-Authored-By: Claude Opus 4.8 <[email protected]>