feat(docs): redesign portal with shared UI system

app/pages/tutorial.wrn

@@ -5,7 +5,7 @@ page Tutorial {
     canonical = "https://wrnexusjs.dev/tutorial"
   }
   view {
-    <a class="skip-link" href="#main">Skip to content</a>
+    <SkipLink label="Skip to content" href="#main" class="docs-skip-link" />
     <div class="docs-shell">
       <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><div class="topbar-actions"><a class="preview-pill" href="/access">Preview · v0.2.64</a><button data-wire-theme-toggle class="theme-button" aria-label="Toggle color theme" title="Toggle color theme">◐</button></div></header>
       <div class="mobile-doc-nav"><details><summary>Browse documentation</summary><nav><a href="/getting-started">Get started</a><a href="/packages">Packages</a><a href="/language">Language</a><a href="/architecture">Architecture</a><a href="/tutorial">Tutorial</a><a href="/guides/project-structure">Guides</a><a href="/examples">Examples</a><a href="/search">Search</a></nav></details></div>
@@ -23,7 +23,8 @@ export const POST = async (ctx) =&gt; &#123;
     &lt;/ul&gt;&lt;/main&gt;
   &#125;
 &#125;</code></pre><h2>Production checklist</h2><ul><li>Choose SQLite for local development or configure the supported PostgreSQL driver.</li><li>Run migrations before accepting traffic.</li><li>Enable session authentication and enforce authorization on every mutation.</li><li>Validate upload types and sizes; keep private objects behind authenticated routes.</li><li>Use Redis pub/sub when realtime rooms span processes.</li><li>Treat the default queue as non-durable until a production driver is selected.</li></ul><p>Follow the focused <a href="/guides/database">database</a>, <a href="/guides/authentication">authentication</a>, <a href="/guides/authorization">authorization</a>, <a href="/guides/realtime">realtime</a>, and <a href="/guides/uploads">upload</a> guides.</p></article></main>
-      <footer><p><strong>WRNexusJS 0.2.64</strong> · Private Developer Preview · Bun-native</p><nav aria-label="Footer"><a href="/access">Request access</a><a href="/license">License</a><a href="/security">Security</a><a href="/support">Support</a><a href="/llms.txt">AI guide</a></nav><p>WRNexusJS is created by <a href="https://workroot.in/">WorkRoot</a>. WRNexus is a separate SaaS product.</p></footer>
+      <footer><div class="footer-brand"><span class="footer-mark" aria-hidden="true">W</span><p><strong>WRNexusJS 0.2.64</strong><span>Server-first documentation for the Bun-native framework.</span></p></div><nav aria-label="Footer"><a href="/access">Request access</a><a href="/license">License</a><a href="/security">Security</a><a href="/support">Support</a><a href="/llms.txt">AI guide</a></nav><p class="footer-meta">Created by <a href="https://workroot.in/">WorkRoot</a> · Private Developer Preview</p></footer>
+      <BackToTop />
     </div>
   }
 }