fix: address code review findings

- Guard against empty awardTypeIds array in AwardRepository
- Refactor Stimulus controller to use data-action attributes instead of
  imperative addEventListener (fixes duplicate listener issue)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/Repository/AwardRepository.php

@@ -36,6 +36,10 @@ class AwardRepository extends ServiceEntityRepository
             ->andWhere('a.actor = :actorId')
             ->setParameter('actorId', $actorId);
 
+        if ($awardTypeIds !== null && empty($awardTypeIds)) {
+            return null;
+        }
+
         if ($awardTypeIds !== null) {
             $qb->andWhere('a.awardType IN (:typeIds)')
                 ->setParameter('typeIds', $awardTypeIds);