fix(label): rewrite track row, add jump-nav, fix description border

- Replace track row with ArtistDetailView pattern (favorites, TrackMenu, radio)
- Add sticky jump-nav bar with IntersectionObserver for all sections
- Fix description border leak with CSS reset
- Make "More labels" containers round
- Wire onTrackAddFavorite prop in +page.svelte
- Add i18n keys: label.about, label.otherLabels (all 4 locales)

src/lib/i18n/locales/de.json

@@ -83,6 +83,8 @@
   },
   "label": {
     "title": "Label",
+    "about": "Über",
+    "otherLabels": "Weitere Labels",
     "popularTracks": "Beliebte Titel",
     "releases": "Veröffentlichungen",
     "criticsPicks": "Kritiker-Auswahl",

src/lib/i18n/locales/en.json

@@ -86,6 +86,8 @@
   },
   "label": {
     "title": "Label",
+    "about": "About",
+    "otherLabels": "Other labels",
     "popularTracks": "Popular Tracks",
     "releases": "Releases",
     "criticsPicks": "Critics' Picks",

src/lib/i18n/locales/es.json

@@ -86,6 +86,8 @@
   },
   "label": {
     "title": "Sello",
+    "about": "Acerca de",
+    "otherLabels": "Otros sellos",
     "popularTracks": "Canciones populares",
     "releases": "Lanzamientos",
     "criticsPicks": "Selección de la crítica",

src/lib/i18n/locales/fr.json

@@ -83,6 +83,8 @@
   },
   "label": {
     "title": "Label",
+    "about": "À propos",
+    "otherLabels": "Autres labels",
     "popularTracks": "Titres populaires",
     "releases": "Sorties",
     "criticsPicks": "Choix des critiques",

src/routes/+page.svelte

@@ -3569,6 +3569,7 @@
           onTrackPlayNext={queueQobuzTrackNext}
           onTrackPlayLater={queueQobuzTrackLater}
           onTrackAddToPlaylist={(trackId) => openAddToPlaylist([trackId])}
+          onTrackAddFavorite={handleAddToFavorites}
           onTrackGoToAlbum={handleAlbumClick}
           activeTrackId={currentTrack?.id ?? null}
           isPlaybackActive={isPlaying}