fix: radio mode appends songs without restarting; favorites/song row mobile fixes

- fillRadioQueue: use addToQueue instead of setQueue so toggling radio mode
  no longer resets position to 0 on the current song
- loadStarred: pass noArtistLink/noAlbumLink to prevent accidental navigation
  taps on mobile (matches playlist behavior)
- styles.css: add pointer:coarse alongside hover:none so song-actions are
  visible on Android WebView which may report hover:hover
- components.js: remove inline download button from song row; keep only star
  and 3-dots (download stays accessible via context menu)

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

styles.css

@@ -189,7 +189,7 @@ nav{flex:1;overflow-y:auto;padding:4px 10px}
 .song-dur{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){.song-actions{opacity:1}}
+@media (hover:none),(pointer:coarse){.song-actions{opacity:1}}
 /* ── 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}