Fix referrers display to show only current referrers.

Updated the view to loop through current referrers in the accompanying period. Added new method `getReferrersHistoryCurrent` to the entity to filter and return only active referrers, ensuring correct display in the UI. Also included documentation for better code clarity.

src/Bundle/ChillPersonBundle/Entity/AccompanyingPeriod/AccompanyingPeriodWork.php

@@ -394,7 +394,13 @@ class AccompanyingPeriodWork implements AccompanyingPeriodLinkedWithSocialIssues
     }
 
     /**
-     * @return ReadableCollection<int, User>
+     * Retrieves a collection of current referrers.
+     *
+     * This method filters the referrer history to get only those entries
+     * where the end date is null, maps them to their associated users,
+     * and returns them as a new ReadableCollection.
+     *
+     * @return ReadableCollection<int, User> collection of active referrers
      *
      * @Serializer\Groups({"accompanying_period_work:edit"})
      */
@@ -408,6 +414,18 @@ class AccompanyingPeriodWork implements AccompanyingPeriodLinkedWithSocialIssues
         return new ArrayCollection(array_values($users));
     }
 
+    /**
+     * @return ReadableCollection<int, AccompanyingPeriodWorkReferrerHistory>
+     */
+    public function getReferrersHistoryCurrent(): ReadableCollection
+    {
+        return new ArrayCollection(
+            $this->getReferrersHistory()
+                ->filter(fn (AccompanyingPeriodWorkReferrerHistory $h) => null === $h->getEndDate())
+                ->getValues()
+        );
+    }
+
     /**
      * @return Collection<int, AccompanyingPeriodWorkReferrerHistory>
      */