fix(ui): stable React list keys on Now Playing cards (#703)

* fix(ui): use stable list keys on Now Playing dashboard cards

Subsonic payloads can repeat the same id in similar artists, album
track rows, and top songs. Keys now combine id with list index so
React reconciliation stays stable and duplicate-key warnings stop.

* docs: changelog and credits for Now Playing list keys (PR #703)

Document the dashboard list key fix in CHANGELOG and Settings contributors.

src/components/nowPlaying/ArtistCard.tsx

@@ -81,8 +81,8 @@ const ArtistCard = memo(function ArtistCard({ artistName, artistId, artistInfo,
       {similar.length > 0 && (
         <div className="np-dash-similar">
           <div className="np-dash-chip-row">
-            {similar.slice(0, 12).map(a => (
-              <span key={a.id} className="np-chip"
+            {similar.slice(0, 12).map((a, idx) => (
+              <span key={`${a.id}-${idx}`} className="np-chip"
                 onClick={() => a.id && onNavigate(`/artist/${a.id}`)}
                 data-tooltip={t('nowPlaying.goToArtist')}>
                 {a.name}