feat(qt): album card quality badges reveal the exact quality on hover

QualityBadge has always owned a hover tooltip, but every AlbumCard host
passed only the tier, so the tip had nothing to say. The card gains a
qualityDetail input feeding the badge's label, and all fifteen mounts
now pass their model's detail (HomeCard rides its qualityLabel twin).
Un-hydrated Plex/remote rows surface their bare filetype — the known
honest fallback; an empty detail still shows no tooltip at all. The
Scene panel's own card already wired this and is untouched.

cc

crates/qbz-qt/qml/views/local/LocalAlbumCollection.qml

@@ -477,6 +477,7 @@ Item {
                                 genre: ""
                                 year: cardCell.slot.year
                                 qualityTier: cardCell.slot.qualityTier
+                                qualityDetail: cardCell.slot.qualityDetail || ""
                                 artSource: cardCell.slot.artPath || (root.view
                                     ? (root.view.artMap[cardCell.slot.artKey] || "") : "")
                                 pinArtworkUrl: artSource