refactor: ein Helfer für Gruppen-Kurznamen (NodeSummary::groupShortName), ESCAPED_LETTER_REGEX am UsageQuery-Interface, Docblock DiviComposition::presets; Tests für Muster, Kurzname und Gruppen-Überdeckung

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/Integrations/Divi/Library/UsageQuery.php

@@ -13,6 +13,12 @@ defined('ABSPATH') || exit;
  */
 interface UsageQuery
 {
+    /**
+     * MySQL REGEXP for a JSON-escaped letter ("\\u004x" … "\\u007x"): a name or ID written that way is not found by
+     * LIKE, so candidate conditions keep such posts (fail closed, ruling P23).
+     */
+    public const ESCAPED_LETTER_REGEX = '\\\\u00[4-7][0-9a-fA-F]';
+
     /** A condition for "WHERE (…)", already passed through $db->prepare(). */
     public function candidateCondition(\wpdb $db): string;