Polish: npm test runs every test file, two silent failures now log, Loading placeholders shimmer

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

public/librivox-view.js

@@ -47,7 +47,7 @@ function lvPlay(b, at) {
 }
 
 async function viewFreeBooks(host) { // host: { el, hash } when shown inside the Store tab
-  const v = host ? host.el : $('#view'), here = () => location.hash.startsWith(host ? host.hash : '#/audio/free'); v.innerHTML = '<div class="wrap"><h1>Free audiobooks</h1><p class="empty">Loading…</p></div>';
+  const v = host ? host.el : $('#view'), here = () => location.hash.startsWith(host ? host.hash : '#/audio/free'); v.innerHTML = '<div class="wrap"><h1>Free audiobooks</h1><p class="empty loading" role="status">Loading…</p></div>';
   try { lvShelf = await lvApi('/shelf'); await lvLoadProg(); } catch (e) { v.innerHTML = `<div class="wrap"><a class="btn ghost" href="#/audio">${icon('back')}Audiobooks</a><p class="err">${esc(e.message)}</p></div>`; return; }
   if (!here()) return;
   const S = { q: '', genre: '', page: 1, items: [], more: false, busy: false, seq: 0 }; let genreList = []; lvApi('/genres').then(r => { genreList = r.genres || []; gchips(); }).catch(() => {});
@@ -78,7 +78,7 @@ async function viewFreeBooks(host) { // host: { el, hash } when shown inside the
 
 async function lvSheet(id, after, known = new Map()) {
     const sum = known.get(id) || lvShelf.find(x => x.id === id) || { id, title: 'Audiobook', author: '' };
-    const el = openSheet(sum.title, sum.author || '', '<p class="empty">Loading…</p>');
+    const el = openSheet(sum.title, sum.author || '', '<p class="empty loading" role="status">Loading…</p>');
     let b; try { b = await lvApi('/book/' + id); } catch (e) { el.querySelector('.empty').outerHTML = `<p class="err">${esc(e.message)}</p>`; return; }
     if (!document.body.contains(el)) return;
     const p = lvLeft(id), total = lvTotal(b), onShelf = () => lvShelf.some(x => x.id === id);