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/LabelView.qml

@@ -218,6 +218,7 @@ Rectangle {
                             genre: crCell.modelData.genre
                             year: crCell.modelData.year
                             qualityTier: crCell.modelData.qualityTier
+                            qualityDetail: crCell.modelData.qualityDetail || ""
                             ribbon: crCell.modelData.ribbon || ""
                             ribbonKind: crCell.modelData.ribbonKind || ""
                             artSource: crCell.modelData.artPath || ""