feat: enhance discovery, vibe sessions, and library enrichment

frontend/src/components/ArtistLinks.tsx

@@ -24,13 +24,9 @@ function deduplicateArtists(artists: TrackArtist[]): TrackArtist[] {
       map.set(a.id, a);
     }
   }
-  // Preserve original order, skipping duplicates.
-  const seen = new Set<string>();
-  return artists.filter((a) => {
-    if (seen.has(a.id)) return false;
-    seen.add(a.id);
-    return true;
-  });
+  // Keep the position of the selected credit and omit every duplicate. This
+  // makes the documented main-over-featured preference real.
+  return artists.filter((a) => map.get(a.id) === a);
 }
 
 /**