feat(docs): redesign portal with shared UI system

app/pages/packages/dev-server.wrn

@@ -6,7 +6,7 @@ page wrnexusdevserver {
 
   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>
@@ -695,7 +695,8 @@ await startGateway(&#123;
 &#125;);</code></pre></article></div></section></article>
       <aside class="on-this-page"><h2>On this page</h2><nav><a class="toc-level-2" href="#guide">Guide</a><a class="toc-level-3" href="#overview">Overview</a><a class="toc-level-3" href="#api">API</a><a class="toc-level-4" href="#main-entry-wrnexus-dev-server">Main entry (@wrnexus/dev-server)</a><a class="toc-level-4" href="#startserver-opts">startServer(opts)</a><a class="toc-level-4" href="#createhandlers-deps">createHandlers(deps)</a><a class="toc-level-4" href="#createproductionserver-manifest-opts-createproductionhandlers-manifest-opts">createProductionServer(manifest, opts) / createProductionHandlers(manifest, opts)</a><a class="toc-level-4" href="#startgateway-opts-multi-app-gateway">startGateway(opts) — multi-app gateway</a><a class="toc-level-4" href="#node-http-adapter-from-adapters-node-ts">node:http adapter (from ./adapters/node.ts)</a><a class="toc-level-4" href="#subpath-export-wrnexus-dev-server-serve-entry">Subpath export: @wrnexus/dev-server/serve-entry</a><a class="toc-level-3" href="#usage">Usage</a><a class="toc-level-4" href="#programmatic-dev-server">Programmatic dev server</a><a class="toc-level-4" href="#production-server-from-a-build-manifest">Production server from a build manifest</a><a class="toc-level-4" href="#embedding-the-handler-on-node-http">Embedding the handler on node:http</a><a class="toc-level-4" href="#multi-app-gateway">Multi-app gateway</a><a class="toc-level-3" href="#framework-asset-routes">Framework asset routes</a><a class="toc-level-3" href="#requirements-notes">Requirements / Notes</a><a class="toc-level-2" href="#api">Complete API</a><a class="toc-level-2" href="#examples">Examples</a></nav></aside>
     </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>
   }
 }