- DedupUI: state locale + folder picker + start/stop scan + render gruppi (checkbox multi-select), file col bitrate max auto-preselezionato come "TIENI" (verde, checkbox disabled), audio preview riusa _makePreviewBtn dal picker Upgrade. - Listener bridge dedup:progress / dedup:done, ripristino ultima cartella + recursive da config al mount. - CSS: .dedup-group-card, .dedup-file-row, .dedup-keep (verde), .dedup-keep-badge, .dedup-footer-bar sticky.