feat: initial ACRIB WordPress deployment

- WordPress 6.9.4 (es_ES) with Kadence theme
- Homepage: Hero, La Asociación, Pilares, Beneficios, Eventos, Miembros, Hazte Miembro, Contacto
- Brand identity: #13294b navy, #a12932 burgundy, #c69c48 gold
- Fonts: Raleway (headings) + Source Sans 3 (body) + Lato (UI)
- Plugins: Kadence Blocks, Polylang, Contact Form 7
- Custom CSS with full brand styling and responsive layout
- HTTPS enforced via wp-config.php proxy detection

wp-includes/customize/class-wp-customize-background-image-setting.php

@@ -0,0 +1,35 @@
+<?php
+/**
+ * Customize API: WP_Customize_Background_Image_Setting class
+ *
+ * @package WordPress
+ * @subpackage Customize
+ * @since 4.4.0
+ */
+
+/**
+ * Customizer Background Image Setting class.
+ *
+ * @since 3.4.0
+ *
+ * @see WP_Customize_Setting
+ */
+final class WP_Customize_Background_Image_Setting extends WP_Customize_Setting {
+
+	/**
+	 * Unique string identifier for the setting.
+	 *
+	 * @since 3.4.0
+	 * @var string
+	 */
+	public $id = 'background_image_thumb';
+
+	/**
+	 * @since 3.4.0
+	 *
+	 * @param mixed $value The value to update. Not used.
+	 */
+	public function update( $value ) {
+		remove_theme_mod( 'background_image_thumb' );
+	}
+}