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>

inc/Template/TemplateController.php

@@ -82,7 +82,14 @@ class TemplateController
         }
 
         if (is_page()) {
-            return 'pages/page.html.twig';
+            $slug = get_page_template_slug();
+            return match ($slug) {
+                'page-landing'    => 'pages/landing.html.twig',
+                'page-full-width' => 'pages/full-width.html.twig',
+                'page-hero'       => 'pages/hero.html.twig',
+                'page-sidebar'    => 'pages/page-sidebar.html.twig',
+                default           => 'pages/page.html.twig',
+            };
         }
 
         if (is_archive()) {