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/components/textarea.wrn

@@ -74,7 +74,7 @@ page TextareaDetail {
         <div class="demo-workbench">
           <div id="textarea-demo-1" class="demo-canvas demo-canvas--1">
             <div class="demo-browser-chrome"><span></span><span></span><span></span><small>Live preview</small></div>
-
+            
             <div class="demo-render"><Textarea size="default" label="Textarea" hiddenLabel="false" placeholder="Enter a sample value" value="sample-1" variant="normal" icon="" inline="false" rows="5" readonly="false" disabled="false" required="false" class="showcase-instance showcase-instance--1" /></div>
           </div>
           <section class="demo-code" aria-label="Production default usage">
@@ -94,7 +94,7 @@ page TextareaDetail {
         <div class="demo-workbench">
           <div id="textarea-demo-2" class="demo-canvas demo-canvas--2">
             <div class="demo-browser-chrome"><span></span><span></span><span></span><small>Live preview</small></div>
-
+            
             <div class="demo-render"><Textarea size="sm" label="Compact example" hiddenLabel="false" placeholder="Enter a sample value" value="sample-2" variant="secondary" icon="icon-[lucide--arrow-right]" inline="false" rows="5" readonly="false" disabled="false" required="false" class="showcase-instance showcase-instance--2" /></div>
           </div>
           <section class="demo-code" aria-label="Compact application usage">
@@ -118,7 +118,7 @@ page TextareaDetail {
         <div class="demo-workbench">
           <div id="textarea-demo-3" class="demo-canvas demo-canvas--3">
             <div class="demo-browser-chrome"><span></span><span></span><span></span><small>Live preview</small></div>
-
+            
             <div class="demo-render"><Textarea size="lg" label="Advanced example" hiddenLabel="false" placeholder="Search by name, email, or identifier" value="sample-3" variant="success" icon="icon-[lucide--trash-2]" inline="false" rows="5" readonly="false" disabled="false" required="false" class="showcase-instance showcase-instance--3" /></div>
           </div>
           <section class="demo-code" aria-label="Rich configuration usage">