Add assignee changed notification event support

app/Actions/Notifications/TicketAssigneeChanged.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace App\Actions\Notifications;
+
+use App\Enums\NotificationEventType;
+use Illuminate\Contracts\Events\ShouldDispatchAfterCommit;
+use Illuminate\Foundation\Events\Dispatchable;
+
+final readonly class TicketAssigneeChanged implements NotificationEvent, ShouldDispatchAfterCommit
+{
+    use Dispatchable;
+
+    public function __construct(
+        public TicketStatusChangedPayload $payload,
+    ) {}
+
+    public function eventType(): NotificationEventType
+    {
+        return NotificationEventType::TicketAssigneeChanged;
+    }
+
+    public function payload(): NotificationEventPayload
+    {
+        return $this->payload;
+    }
+}