feat: sync showcase with WRNexusJS 0.8.72 and @wrnexus/ui 0.8.88

- Sync app, public, scripts, test and examples from the framework's
  component-showcase: redesigned component demos, marketing blocks under
  /blocks, template and preview galleries, distinct Timeline/Section
  variants, Chat Bubble receipts, a top-placement Drawer demo, and the
  playground code panel fix (objects in array props no longer blank out).
- Standalone adaptations kept: the generator and tests read
  component-reference.json from the published @wrnexus/ui, and tests use
  the published @wrnexus/compiler and @wrnexus/syntax.
- Dependencies: every @wrnexus/* package to its latest release (ui 0.8.88,
  styles 0.8.26, core 0.8.16, cli 0.8.72, ...), happy-dom for the
  playground tests, Tailwind 4.3; bun.lock and package-lock.json refreshed.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/pages/blocks/feature-icon-card.wrn

@@ -0,0 +1,10 @@
+page FeatureIconCardBlock {
+ layout = "gallery"
+ 
+ seo { title = "Feature Icon Card block" }
+ view { <header class="docs-intro"><a href="/block-library">← All blocks</a><h1>Feature Icon Card</h1><p>A ready-to-use section. Copy the complete example below.</p></header><section class="block-live-preview"><FeatureIconCard icon="icon-[lucide--shield-check]" title="Secure by design" description="Build with consistent validation, accessibility, and theme support." href="#security" actionLabel="Review security" badge="Core" size="default" variant="default" align="start" clickableSurface="false" descriptionTone="A polished default feature icon card for a modern application." class="showcase-instance showcase-instance--1" /></section><section class="example-code-panel"><header><h2>Copy this example</h2><button type="button" data-copy-target="#example-source">Copy code</button></header><pre><code id="example-source">page FeatureIconCardExample <span>&#123;</span>
+  view <span>&#123;</span>
+    &lt;FeatureIconCard icon="icon-[lucide--shield-check]" title="Secure by design" description="Build with consistent validation, accessibility, and theme support." href="#security" actionLabel="Review security" badge="Core" size="default" variant="default" align="start" clickableSurface="false" descriptionTone="A polished default feature icon card for a modern application." class="showcase-instance showcase-instance--1" /&gt;
+  <span>&#125;</span>
+<span>&#125;</span></code></pre></section> }
+}