Refresh UI components and showcase; release updated framework packages

examples/component-showcase/app/layouts/gallery.wrn

@@ -0,0 +1,8 @@
+layout Gallery {
+ view {
+  <div class="gallery-shell">
+   <header class="gallery-header"><a href="/preview" class="showcase-brand">WRNexus UI</a><nav aria-label="Main navigation"><a href="/docs">Components</a><a href="/preview">Examples</a><a href="/block-library">Blocks</a><a href="/templates">Templates</a></nav></header>
+   <main class="gallery-main"><slot /></main>
+  </div>
+ }
+}