fix: unify responsive design across documentation portal

app/pages/packages/i18n.wrn

@@ -9,9 +9,8 @@ page wrnexusi18n {
       <a class="skip-link" href="#main">Skip to content</a>
       <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><a href="/support">Support</a></nav>
-        <a class="preview-pill" href="/access">Private preview · v0.2.15</a>
-        <button data-wire-theme-toggle class="theme-button" aria-label="Toggle theme">Theme</button>
+        <nav aria-label="Primary"><a href="/getting-started">Get started</a><a href="/tutorial">Tutorial</a><a href="/packages">Packages</a><a href="/guides/project-structure">Guides</a><a href="/language">.wrn language</a><a href="/examples">Examples</a><a href="/search">Search</a></nav>
+        <div class="topbar-actions"><a class="preview-pill" href="/access">Preview · v0.2.15</a><button data-wire-theme-toggle class="theme-button" aria-label="Toggle color theme" title="Toggle color theme">◐</button></div>
       </header>
       <main class="page package-page">
       <aside class="sidebar"><a href="/packages">← All packages</a><span class="category">Frontend</span><h2>@wrnexus/i18n</h2><p>Translation loading, locale resolution, and Intl formatting.</p><span class="status status-beta">Private preview · 0.2.15</span><nav><a href="#access">Access</a><a href="#guide">Guide</a><a href="#api">Complete API</a></nav></aside>
@@ -19,7 +18,6 @@ page wrnexusi18n {
 <p>Part of the <strong>WRNexusJS</strong> framework — an SSR-first, Bun-native full-stack web framework.</p>
 <h3 id="overview">Overview</h3>
 <p><code>@wrnexus/i18n</code> loads locale files from <code>app/locales/&lt;lang&gt;.json</code>, resolves the active language for each request (cookie → <code>Accept-Language</code> → default), and builds a <code>t(key, params)</code> translator used both in server code and in <code>.wrn</code> views. It also ships Intl-based formatting helpers and a tiny client runtime that wires up a language switcher. Translation lookup, language resolution, and HTML marker rewriting run server-side; only the small <code>I18N_RUNTIME</code> snippet runs in the browser.</p>
-<h3 id="installation">Installation</h3>
 <pre data-language="bash"><code>bun add @wrnexus/i18n</code></pre>
 <blockquote>Private package — the machine must be authenticated to the <code>wrnexus</code> npm org</blockquote>
 <blockquote>(a read token in <code>~/.npmrc</code>). Requires <strong>Bun</strong> (Node is not supported).</blockquote>
@@ -209,7 +207,7 @@ const finalHtml = translateHtml(renderedHtml, t);</code></pre></article><article
   &quot;greeting&quot;: &quot;Hello, &#123;name&#125;&quot;
 &#125;</code></pre></article><article class="example-card"><h3>Example 4</h3><pre data-language="html"><code>&lt;h1 data-t=&quot;nav.home&quot;&gt;Home&lt;/h1&gt;
 &lt;input t:placeholder=&quot;search.placeholder&quot; /&gt;</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="#installation">Installation</a><a class="toc-level-3" href="#api">API</a><a class="toc-level-4" href="#loading-resolving">Loading &amp; resolving</a><a class="toc-level-4" href="#types-constants">Types &amp; constants</a><a class="toc-level-4" href="#html-client-runtime">HTML &amp; client runtime</a><a class="toc-level-4" href="#formatting-helpers-re-exported-from-format-ts">Formatting helpers (re-exported from ./format.ts)</a><a class="toc-level-3" href="#usage">Usage</a><a class="toc-level-4" href="#server-load-resolve-translate">Server: load, resolve, translate</a><a class="toc-level-4" href="#views-translation-markers">Views: translation markers</a><a class="toc-level-4" href="#client-language-switcher">Client: language switcher</a><a class="toc-level-4" href="#formatting">Formatting</a><a class="toc-level-3" href="#configuration">Configuration</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>
+      <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="#loading-resolving">Loading &amp; resolving</a><a class="toc-level-4" href="#types-constants">Types &amp; constants</a><a class="toc-level-4" href="#html-client-runtime">HTML &amp; client runtime</a><a class="toc-level-4" href="#formatting-helpers-re-exported-from-format-ts">Formatting helpers (re-exported from ./format.ts)</a><a class="toc-level-3" href="#usage">Usage</a><a class="toc-level-4" href="#server-load-resolve-translate">Server: load, resolve, translate</a><a class="toc-level-4" href="#views-translation-markers">Views: translation markers</a><a class="toc-level-4" href="#client-language-switcher">Client: language switcher</a><a class="toc-level-4" href="#formatting">Formatting</a><a class="toc-level-3" href="#configuration">Configuration</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 0.2.15 · Private Developer Preview · Bun-native · Documentation generated from installed package APIs.</footer>
     </div>