v0.2.0 - Design Editor: templates, patterns, header/footer variations

Full Design Editor compatibility with custom block categories, page templates,
header/footer variations, and navigation styles. Both FSE (admin) and Twig
(frontend) sides kept in sync.

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

views/partials/footer-minimal.html.twig

@@ -0,0 +1,8 @@
+<footer class="bg-body-tertiary mt-auto">
+    <div class="container py-4">
+        <hr class="mb-4">
+        <p class="text-body-secondary text-center small mb-0">
+            &copy; {{ current_year }} {{ site.name }}. {{ __('All rights reserved.') }}
+        </p>
+    </div>
+</footer>