```

refactor: add type hints and improve method signatures

- add return type declarations to methods in `ExportGenerationVoter`
- add type hints to `EntityToJsonTransformer` methods
- include `ExceptionInterface` in `EntityToJsonTransformer` for better error handling
```

src/Bundle/ChillMainBundle/Form/Type/DataTransformer/EntityToJsonTransformer.php

@@ -18,6 +18,7 @@ use Chill\PersonBundle\Entity\Person;
 use Chill\ThirdPartyBundle\Entity\ThirdParty;
 use Symfony\Component\Form\DataTransformerInterface;
 use Symfony\Component\Form\Exception\TransformationFailedException;
+use Symfony\Component\Serializer\Exception\ExceptionInterface;
 use Symfony\Component\Serializer\Normalizer\AbstractNormalizer;
 use Symfony\Component\Serializer\Normalizer\DenormalizerInterface;
 use Symfony\Component\Serializer\SerializerInterface;
@@ -26,7 +27,7 @@ class EntityToJsonTransformer implements DataTransformerInterface
 {
     public function __construct(private readonly DenormalizerInterface $denormalizer, private readonly SerializerInterface $serializer, private readonly bool $multiple, private readonly string $type) {}
 
-    public function reverseTransform($value)
+    public function reverseTransform(mixed $value): mixed
     {
         if ('' === $value) {
             return $this->multiple ? [] : null;
@@ -54,8 +55,9 @@ class EntityToJsonTransformer implements DataTransformerInterface
 
     /**
      * @param User|User[] $value
+     * @throws ExceptionInterface
      */
-    public function transform($value): string
+    public function transform(mixed $value): mixed
     {
         if (null === $value) {
             return $this->multiple ? 'null' : '[]';

src/Bundle/ChillMainBundle/Security/Authorization/ExportGenerationVoter.php

@@ -19,12 +19,12 @@ class ExportGenerationVoter extends Voter
 {
     public const VIEW = 'view';
 
-    protected function supports(string $attribute, $subject)
+    protected function supports(string $attribute, $subject): bool
     {
         return self::VIEW === $attribute && $subject instanceof ExportGeneration;
     }
 
-    protected function voteOnAttribute(string $attribute, $subject, TokenInterface $token)
+    protected function voteOnAttribute(string $attribute, $subject, TokenInterface $token): bool
     {
         /* @var ExportGeneration $subject */
         return $token->getUser()->getUserIdentifier() === $subject->getCreatedBy()->getUserIdentifier();