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>

patterns/layout-container.php

@@ -0,0 +1,20 @@
+<?php
+/**
+ * Title: Bootstrap Container
+ * Slug: wp-bootstrap/layout-container
+ * Categories: wp-bootstrap-layout
+ * Description: A constrained container with padding, containing a heading and paragraph placeholder.
+ *
+ * @package WPBootstrap
+ * @since 0.2.0
+ */
+?>
+<!-- wp:group {"align":"full","style":{"spacing":{"padding":{"top":"var:preset|spacing|60","bottom":"var:preset|spacing|60","left":"var:preset|spacing|40","right":"var:preset|spacing|40"}}},"layout":{"type":"constrained"}} -->
+<div class="wp-block-group alignfull" style="padding-top:var(--wp--preset--spacing--60);padding-right:var(--wp--preset--spacing--40);padding-bottom:var(--wp--preset--spacing--60);padding-left:var(--wp--preset--spacing--40)"><!-- wp:heading {"fontSize":"xx-large"} -->
+<h2 class="wp-block-heading has-xx-large-font-size"><?php esc_html_e( 'Heading goes here', 'wp-bootstrap' ); ?></h2>
+<!-- /wp:heading -->
+
+<!-- wp:paragraph -->
+<p><?php esc_html_e( 'This is a content container with constrained width and comfortable padding. Replace this text with your own content.', 'wp-bootstrap' ); ?></p>
+<!-- /wp:paragraph --></div>
+<!-- /wp:group -->