fix: lyrics race condition, PC scroll, artwork matching, accidental artist/album taps

- nowplaying: add cancellation token to _loadNpLyrics to prevent stale async
  calls overwriting newer results (synced→plain race condition)
- nowplaying: replace scrollIntoView with explicit container.scrollTo to prevent
  page-level scroll on desktop (topbar shifting / gap at edge)
- backend: remove results[0] fallback in lookupItunesTrackMeta — only use
  exact title+artist match to avoid embedding wrong artwork
- components/views: makeSongItem accepts noArtistLink/noAlbumLink opts;
  album-detail disables both, playlist-detail disables artist link

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/novasonic-server.js

@@ -145,7 +145,7 @@ async function lookupItunesTrackMeta(artist, title) {
     const match = results.find(t =>
       norm(t.trackName) === norm(title) &&
       norm(t.artistName).split(' ')[0] === norm(artist).split(' ')[0]
-    ) || results[0];
+    );
     if (!match) return {};
     return {
       album:       match.collectionName || '',