feat(docs): redesign portal with shared UI system

app/pages/packages.wrn

@@ -8,7 +8,7 @@ page Packages {
 
   view {
     <div class="docs-shell">
-      <a class="skip-link" href="#main">Skip to content</a>
+      <SkipLink label="Skip to content" href="#main" class="docs-skip-link" />
       <header class="topbar">
         <a class="brand" href="/"><span>W</span> WRNexusJS</a>
         <nav aria-label="Primary"><a href="/getting-started">Get started</a><a href="/packages">Packages</a><a href="/language">Language</a><a href="/architecture">Architecture</a></nav>
@@ -93,7 +93,8 @@ page Packages {
 <a class="package-card" href="/packages/validation" data-show="(category === 'All' ? true : category === 'Security') ? (query === '' ? true : 'validation security typed schemas, coercion, validation, and browser descriptors. '.includes(query.toLowerCase())) : false">
           <span class="category">Security</span><h2>@wrnexus/validation</h2><p>Typed schemas, coercion, validation, and browser descriptors.</p><span class="card-link">Open documentation →</span>
         </a></section></main>
-      <footer>WRNexusJS 0.2.64 · Private Developer Preview · Bun-native · Documentation generated from installed package APIs.</footer>
+      <footer><div class="footer-brand"><span class="footer-mark" aria-hidden="true">W</span><p><strong>WRNexusJS 0.2.64</strong><span>Complete API documentation generated from installed package declarations.</span></p></div><nav aria-label="Footer"><a href="/packages">All packages</a><a href="/getting-started">Get started</a><a href="/security">Security</a><a href="/support">Support</a><a href="/llms.txt">AI guide</a></nav><p class="footer-meta">Private Developer Preview · Bun-native</p></footer>
+      <BackToTop />
     </div>
   }
 }