fix: 15s scrobble, play count clarity, star always visible, all-songs actions

- Scrobble timer: 12s → 15s
- Play count moved after action buttons, shown as "23×" (distinct from duration)
- Song star/menu buttons always visible (removed opacity:0 hover-only rule)
- Artist all-songs page: added star + 3-dots to every row (same as top songs)
- Hero card: picks from full recent+frequent pool (was capped at first 5 = all frequent)

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

styles.css

@@ -219,10 +219,9 @@ button:focus{outline:none}
 .song-info .song-artist{font-size:11px;color:var(--text2);margin-top:1px}
 .song-meta{display:flex;align-items:center;gap:6px}
 .song-dur{font-size:11px;color:var(--text3);font-family:var(--mono)}
-.song-plays{font-size:11px;color:var(--text3);font-family:var(--mono)}
-.song-actions{display:flex;gap:2px;opacity:0;transition:opacity .15s}
-.song-item:hover .song-actions{opacity:1}
-@media (hover:none),(pointer:coarse){.song-actions{opacity:1}}
+.song-plays{font-size:11px;color:var(--text3);font-family:var(--mono);min-width:28px;text-align:right}
+.song-plays-x{font-size:9px;opacity:.6;margin-left:1px}
+.song-actions{display:flex;gap:2px}
 /* ── PLAYLIST DRAG & DROP ── */
 .song-list.pl-draggable .song-item{grid-template-columns:18px 32px 44px 1fr auto}
 .pl-drag-handle{display:flex;align-items:center;justify-content:center;color:var(--text3);opacity:0;cursor:grab;transition:opacity .15s;touch-action:none}