fix: unify responsive design across documentation portal

app/pages/packages/oauth.wrn

@@ -9,9 +9,8 @@ page wrnexusoauth {
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       <aside class="sidebar"><a href="/packages">← All packages</a><span class="category">Security</span><h2>@wrnexus/oauth</h2><p>OAuth 2.0, PKCE, provider presets, and profile mapping.</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 wrnexusoauth {
 <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/oauth</code> implements the OAuth 2.0 Authorization Code flow (with PKCE) for server-side sign-in. It ships ready-made provider presets and a <code>defineProvider</code> helper for custom providers, then gives you two flow functions — <code>startAuth</code> (build the redirect) and <code>completeAuth</code> (exchange the code and fetch the user's profile). It has no runtime dependencies: it uses the platform <code>fetch</code> and WebCrypto only. Pairs naturally with <code>@wrnexus/core</code>'s <code>logIn</code> to establish a session once you have a normalized profile.</p>
-<h3 id="installation">Installation</h3>
 <pre data-language="bash"><code>bun add @wrnexus/oauth</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>
@@ -263,7 +261,7 @@ interface StartAuthResult &#123;
   state: string; // CSRF state — verify on callback
   verifier: string; // PKCE code verifier — pass to completeAuth
 &#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="#providers">Providers</a><a class="toc-level-4" href="#flow">Flow</a><a class="toc-level-4" href="#startauth-provider-options-promise-startauthresult">startAuth(provider, options): Promise&lt;StartAuthResult&gt;</a><a class="toc-level-4" href="#completeauth-provider-options-promise-tokens-profile">completeAuth(provider, options): Promise&lt;&#123; tokens, profile &#125;&gt;</a><a class="toc-level-4" href="#lower-level-helpers">Lower-level helpers</a><a class="toc-level-4" href="#types">Types</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="#providers">Providers</a><a class="toc-level-4" href="#flow">Flow</a><a class="toc-level-4" href="#startauth-provider-options-promise-startauthresult">startAuth(provider, options): Promise&lt;StartAuthResult&gt;</a><a class="toc-level-4" href="#completeauth-provider-options-promise-tokens-profile">completeAuth(provider, options): Promise&lt;&#123; tokens, profile &#125;&gt;</a><a class="toc-level-4" href="#lower-level-helpers">Lower-level helpers</a><a class="toc-level-4" href="#types">Types</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>
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