Add Creative Elements templates and update index files

- Introduced new templates for catalog, checkout, contact, and error pages.
- Implemented caching headers and redirection in index.php files across various directories.
- Enhanced product and layout templates for better integration with Creative Elements.
- Added backoffice header styles and scripts for improved UI/UX in the admin panel.

modules/creativeelements/views/lib/filemanager/config.php

@@ -0,0 +1,46 @@
+<?php
+/**
+ * Creative Elements - live Theme & Page Builder
+ *
+ * @author    WebshopWorks
+ * @copyright 2019-2022 WebshopWorks.com
+ * @license   One domain support license
+ */
+
+defined('_PS_VERSION_') or die;
+
+if (Tools::getValue('field_id') !== '3' && basename($_SERVER['SCRIPT_NAME']) === 'dialog.php') {
+	return;
+}
+
+$ext_img[] = 'webp';
+$mime_img[] = 'image/webp';
+$mime_img[] = 'image/svg+xml';
+
+$ext[] = 'webp';
+$mime[] = 'image/webp';
+$mime[] = 'image/svg+xml';
+
+if (in_array(Tools::getValue('action'), ['rename_file', 'duplicate_file', 'delete_file'])) {
+	${'_POST'}['path'] = Tools::substr(${'_POST'}['path_thumb'], Tools::strlen($thumbs_base_path));
+}
+
+if (isset($_FILES['file']['name'])) {
+	if (!strcasecmp('svg', pathinfo($_FILES['file']['name'], PATHINFO_EXTENSION))) {
+		$svg = file_get_contents($_FILES['file']['tmp_name']);
+
+		if (!preg_match('/^<\?xml version="1\.\d+"(\s+encoding="[^"]+")?\s+\?\>/', $svg)) {
+			// SVG upload compatibility fix
+			file_put_contents($_FILES['file']['tmp_name'], '<?xml version="1.0" encoding="UTF-8"?>' . $svg);
+		}
+	}
+
+	register_shutdown_function(function () {
+		$error = error_get_last();
+
+	    if ($error && stripos($error['message'], '.webp is missing or invalid') !== false) {
+	    	// Ignore WEBP thumbnail generation error
+	    	http_response_code(200);
+	    }
+	});
+}