fix: unify responsive design across documentation portal

app/pages/packages/mobile.wrn

@@ -9,9 +9,8 @@ page wrnexusmobile {
       <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">Native</span><h2>@wrnexus/mobile</h2><p>SSR-safe compatibility access to Capacitor plugins.</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>