docs: add inline documentation where missing

src/Security/Voter/BookingVoter.php

@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace App\Security\Voter;
 
 use App\BusProNet\Model\Booking;
@@ -7,6 +9,13 @@ use App\Entity\User;
 use Symfony\Component\Security\Core\Authentication\Token\TokenInterface;
 use Symfony\Component\Security\Core\Authorization\Voter\Voter;
 
+/**
+ * Determines access permissions for booking operations.
+ *
+ * Enforces ownership check via personId matching. VIEW access requires ownership,
+ * EDIT access additionally requires the booking to be in an editable state
+ * (determined by booking.isEditable()).
+ */
 class BookingVoter extends Voter
 {
     public const VIEW = 'VIEW';