feat(web+android): search play queues only the tapped song (radio fills the rest)

Playing a song from search results queued the whole result list. Now it plays only
the clicked song; Radio mode, if on, fills the rest — closer to Spotify. Both
platforms already trigger a radio top-up on the first track (web playQueue →
fillRadioQueue; Android onMediaItemTransition → checkRadioRefill), so no extra wiring
is needed. Album/playlist play still queues the full list. Bump SW cache to ns-v44.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/ui/components.js

@@ -35,7 +35,7 @@ export function makeAlbumCard(a) {
 }
 
 // ─── SONG LIST ITEM (library) ───
-export function makeSongItem(s, idx, list, { noArtistLink = false } = {}) {
+export function makeSongItem(s, idx, list, { noArtistLink = false, singlePlay = false } = {}) {
   const el = document.createElement('div');
   if(s.starred && !s._starred) s._starred = true;
   el.className = 'song-item' + (S.queue[S.qIdx]?.id === s.id ? ' playing' : '');
@@ -69,7 +69,8 @@ export function makeSongItem(s, idx, list, { noArtistLink = false } = {}) {
   const btns = el.querySelectorAll('.icon-btn');
   btns[0].onclick = (e) => { e.stopPropagation(); toggleStar(s, btns[0]); };
   btns[1].onclick = (e) => { e.stopPropagation(); showCtxMenu(e, s, list, idx); };
-  el.onclick = () => playQueue(list, idx, { noShuffle: true });
+  // singlePlay (search results): play only the clicked song; Radio mode (if on) fills the rest.
+  el.onclick = () => singlePlay ? playQueue([s], 0, { noShuffle: true }) : playQueue(list, idx, { noShuffle: true });
   el.addEventListener('contextmenu', e => { e.preventDefault(); showCtxMenu(e, s, list, idx); });
   return el;
 }