Fix TicketVoter assert to accept Person subject

The voter supports Person::class for READ via voterHelper, but the
assert in voteOnAttribute() only accepted Ticket|null. This caused
assertion failures when rendering person pages that check ticket
permissions via menu rendering.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/Bundle/ChillTicketBundle/src/Security/Voter/TicketVoter.php

@@ -50,7 +50,7 @@ final class TicketVoter extends Voter implements ProvideRoleHierarchyInterface
 
     protected function voteOnAttribute(string $attribute, $subject, TokenInterface $token): bool
     {
-        assert($subject instanceof Ticket || null === $subject);
+        assert($subject instanceof Ticket || $subject instanceof Person || null === $subject);
 
         $user = $token->getUser();