Detect Kulturhauptdorf events by tag name instead of tag ID 21

The event detail template data set has_tag_21 to drive the
Kulturhauptdorf logo, but tag 21 is "Feste & Märkte", so the logo
showed on every market/festival event. Add is_kulturhauptdorf, which
checks for a tag named "Kulturhauptdorf" (case-insensitive), and keep
has_tag_21 as deprecated for backwards compatibility.

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

src/EventListener/EventFullTemplateDataListener.php

@@ -13,6 +13,8 @@ use Doctrine\DBAL\ParameterType;
 #[AsHook('parseTemplate', method: 'onParseTemplate')]
 class EventFullTemplateDataListener
 {
+    private const KULTURHAUPTDORF_TAG = 'Kulturhauptdorf';
+
     public function __construct(
         private readonly Connection $connection,
     ) {
@@ -42,6 +44,10 @@ class EventFullTemplateDataListener
         $template->location_row = $locationRow;
         $template->organizations = $organizations;
         $template->tags = $tags;
+        $template->is_kulturhauptdorf = $this->hasTagNamed($tags, self::KULTURHAUPTDORF_TAG);
+
+        // Deprecated: Tag 21 ist "Feste & Märkte", nicht Kulturhauptdorf. Nur noch aus
+        // Kompatibilitätsgründen gesetzt; für das Kulturhauptdorf-Logo is_kulturhauptdorf verwenden.
         $template->has_tag_21 = \in_array(21, array_map(static fn (array $tag): int => (int) ($tag['id'] ?? 0), $tags), true);
 
         if ($locationRow && '' !== ($locationRow['lng'] ?? '') && '' !== ($locationRow['lat'] ?? '') && 58 !== (int) ($locationRow['id'] ?? 0)) {
@@ -121,6 +127,20 @@ class EventFullTemplateDataListener
         return $organizations;
     }
 
+    /** @param list<array<string, string>> $tags */
+    private function hasTagNamed(array $tags, string $name): bool
+    {
+        foreach ($tags as $tag) {
+            foreach ([$tag['tag'] ?? '', $tag['title'] ?? ''] as $value) {
+                if (0 === strcasecmp(trim((string) $value), $name)) {
+                    return true;
+                }
+            }
+        }
+
+        return false;
+    }
+
     /** @return list<array<string, string>> */
     private function fetchTags(int $eventId): array
     {