fix: unify responsive design across documentation portal

app/pages/packages/validation.wrn

@@ -9,9 +9,8 @@ page wrnexusvalidation {
       <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">Security</span><h2>@wrnexus/validation</h2><p>Typed schemas, coercion, validation, and browser descriptors.</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 wrnexusvalidation {
 <p>Part of the <strong>WRNexusJS</strong> framework — an SSR-first, Bun-native full-stack web framework.</p>
 <h3 id="overview">Overview</h3>
 <p>Define a schema once with the fluent <code>v</code> builder, then reuse it in three places: <code>.parse()</code> runs server-side and returns coerced values plus per-field errors; <code>.describe()</code> emits a plain-JSON <code>SchemaDescriptor</code> that the browser runtime interprets (no <code>eval</code>, no bundled validator); and helpers like <code>parseBody</code> and <code>parseEnv</code> wire schemas straight into API routes and startup config. The server rule logic (<code>applyRule</code>/<code>checkField</code>) and the client runtime (<code>VALIDATE_RUNTIME</code>) mirror each other exactly, so a form validates identically in both places. Schemas are conventionally kept in <code>app/schemas/</code>.</p>
-<h3 id="installation">Installation</h3>
 <pre data-language="bash"><code>bun add @wrnexus/validation</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>
@@ -310,7 +308,7 @@ schema.describe(): SchemaDescriptor</code></pre></article><article class="exampl
   value: T; // coerced values (present pass or fail)
   errors: Record&lt;string, string&gt;; // field name → first failing message
 &#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="#installation">Installation</a><a class="toc-level-3" href="#api">API</a><a class="toc-level-4" href="#the-v-builder">The v builder</a><a class="toc-level-4" href="#objectschema">ObjectSchema</a><a class="toc-level-4" href="#rules-and-coercion">Rules and coercion</a><a class="toc-level-4" href="#api-helpers">API helpers</a><a class="toc-level-4" href="#environment-config">Environment config</a><a class="toc-level-4" href="#client-runtime-from-runtime-ts">Client runtime (from runtime.ts)</a><a class="toc-level-3" href="#usage">Usage</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="#the-v-builder">The v builder</a><a class="toc-level-4" href="#objectschema">ObjectSchema</a><a class="toc-level-4" href="#rules-and-coercion">Rules and coercion</a><a class="toc-level-4" href="#api-helpers">API helpers</a><a class="toc-level-4" href="#environment-config">Environment config</a><a class="toc-level-4" href="#client-runtime-from-runtime-ts">Client runtime (from runtime.ts)</a><a class="toc-level-3" href="#usage">Usage</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>