Store: Smashwords as a family-filtered book source; free audiobooks stream through the hub; extensions and Sites on Home

- Smashwords: free EPUBs from its shelf feed, filtered (adult/erotica flags, LGBTQ+, keywords, unlabelled romance); admin saves a Smashwords sign-in (encrypted) used to download
- LibriVox chapter audio is fetched and streamed by the hub (with seeking) instead of redirecting the browser to archive.org
- Home: a My apps section with installed extensions and Sites, also in the command palette

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

public/store-view.js

@@ -219,3 +219,15 @@ async function stRunSite(el, id) {
     <iframe title="${esc(it.title)}" src="${esc(it.url)}" sandbox="allow-scripts allow-same-origin allow-forms allow-popups allow-popups-to-escape-sandbox" referrerpolicy="no-referrer" style="width:100%;height:calc(100dvh - 190px);min-height:360px;border:1px solid var(--line);border-radius:12px;background:#fff"></iframe>
     <p class="sub" style="margin-top:8px">If the page stays blank, that site does not allow being shown here. Use New tab.</p>`;
 }
+
+/** On Home, under the app tiles: the extensions this person installed, and the Sites that were added to My Store, one tap away. */
+async function stHomeExt(el) {
+  if (!el) return;
+  try { await stLoad(); } catch { return; }
+  if (!el.isConnected) return;
+  const mine = stItems.filter(i => (i.kind === 'extension' && stInstalled.includes(i.id)) || i.kind === 'link');
+  if (!mine.length) { el.innerHTML = ''; return; }
+  const tileOf = i => { const href = i.kind === 'extension' ? '#/store/ext/' + i.id : i.embed ? '#/store/site/' + i.id : i.url, ext = i.kind === 'link' && !i.embed;
+    return `<a class="tile" href="${esc(href)}" ${ext ? 'target="_blank" rel="noopener noreferrer"' : ''}><span class="ic" style="background:hsl(${stHue(i.title)} 55% 42%);font-weight:700;font-size:20px">${esc(i.icon || (i.title.match(/\p{L}|\p{N}/u) || ['?'])[0].toUpperCase())}</span><b>${esc(i.title)}</b><small>${i.kind === 'extension' ? 'Extension' : 'Site'}</small></a>`; };
+  el.innerHTML = `<h2>My apps</h2><div class="grid">${mine.map(tileOf).join('')}</div>`;
+}