feat: deployable design studio and updated component showcase

app/pages/dark-mode.wrn

@@ -10,7 +10,7 @@ page DarkModeGuide {
       <header class="docs-intro"><span class="showcase-eyebrow">Customization</span><h1>Dark mode</h1><p>Choose light, dark, or system mode. The selection persists and updates every preview.</p></header>
       <section class="guide-section"><h2>Overview</h2><p>Choose light, dark, or system mode. The selection persists and updates every preview.</p></section><section class="guide-section"><h2>Configuration</h2><p>Use the design switcher in the header to test this setting live.</p></section><section class="guide-section"><h2>Component behavior</h2><p>The setting is inherited by components, blocks, templates, and playground previews.</p></section>
       <section class="guide-section"><h2>Use semantic colors in both modes</h2><p>Use shared surface, text, border and focus tokens instead of hard-coded white and black. Check disabled, hover, selected and error states in both themes using the appearance control.</p><pre><code>.panel <span>&#123;</span> background: var(--wrn-color-surface); color: var(--wrn-color-text); border: 1px solid var(--wrn-color-border); <span>&#125;</span></code></pre><h3>Verify the result</h3><p>Open the matching component page, change its options, and try the keyboard controls. Copy the demonstrated configuration into your page, then replace sample content with your data.</p></section>
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       <nav class="guide-next"><a href="/components/button">Explore components <span aria-hidden="true">→</span></a><a href="/block-library">Browse blocks <span aria-hidden="true">→</span></a></nav>
     </article>
   }