Allow heading tags (h1-h6) in ContentSanitizer so news editor headings render

app/Support/ArtworkDescriptionContentValidator.php

@@ -0,0 +1,24 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Support;
+
+use App\Services\ContentSanitizer;
+
+final class ArtworkDescriptionContentValidator
+{
+    /**
+     * @return list<string>
+     */
+    public static function errors(null|string $value): array
+    {
+        $normalized = trim((string) ($value ?? ''));
+
+        if ($normalized === '') {
+            return [];
+        }
+
+        return ContentSanitizer::validate($normalized);
+    }
+}