feat: show album above artist in bottom bar; close ctx menu on scroll

- Player bar sub-line now shows album (clickable) on first row, artist below
- Context menu now closes on scroll and touchmove (was staying open on mobile)

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

src/ui.js

@@ -158,6 +158,8 @@ export function hideCtxMenu() {
 document.addEventListener('click', e => {
   if(!document.getElementById('ctx-menu').contains(e.target)) hideCtxMenu();
 });
+document.addEventListener('scroll', () => hideCtxMenu(), { passive: true, capture: true });
+document.addEventListener('touchmove', () => hideCtxMenu(), { passive: true, capture: true });
 document.addEventListener('keydown', e => { if(e.key==='Escape') hideCtxMenu(); });
 
 // ─── PLAYLIST MODAL (Add to / Create) ───