Add assignee changed notification event support

app/Actions/Notifications/TicketStatusChangedPayload.php

@@ -17,11 +17,16 @@ final readonly class TicketStatusChangedPayload implements NotificationEventPayl
         public string $ticketUrl,
         public ?int $actorId,
         public ?string $actorName,
-        public int $fromStatusId,
-        public string $fromStatusLabel,
+        public ?int $fromStatusId,
+        public ?string $fromStatusLabel,
         public int $toStatusId,
         public string $toStatusLabel,
         public CarbonImmutable $occurredAt,
+        public ?int $fromAssigneeId = null,
+        public ?string $fromAssigneeName = null,
+        public ?int $toAssigneeId = null,
+        public ?string $toAssigneeName = null,
+        public NotificationEventType $eventType = NotificationEventType::TicketStatusChanged,
     ) {}
 
     public function projectId(): int
@@ -50,9 +55,11 @@ final readonly class TicketStatusChangedPayload implements NotificationEventPayl
             '$ticket_key' => $this->ticketKey,
             '$ticket_title' => $this->ticketTitle,
             '$project_name' => $this->projectName,
-            '$status_from' => $this->fromStatusLabel,
+            '$status_from' => $this->fromStatusLabel ?? '',
             '$status_to' => $this->toStatusLabel,
             '$actor_name' => $this->actorName ?? '',
+            '$assignee_from' => $this->fromAssigneeName ?? '',
+            '$assignee_to' => $this->toAssigneeName ?? '',
         ];
     }
 
@@ -62,7 +69,11 @@ final readonly class TicketStatusChangedPayload implements NotificationEventPayl
      *     project: array{id: int, key: string, name: string},
      *     ticket: array{id: int, key: string, title: string},
      *     actor: array{id: int, name: string}|null,
-     *     from: array{id: int, label: string},
+     *     assignee: array{
+     *         from: array{id: int, name: string}|null,
+     *         to: array{id: int, name: string}|null
+     *     },
+     *     from: array{id: int, label: string}|null,
      *     to: array{id: int, label: string},
      *     ticket_url: string,
      *     occurred_at: string
@@ -71,7 +82,7 @@ final readonly class TicketStatusChangedPayload implements NotificationEventPayl
     public function toArray(): array
     {
         return [
-            'event_type' => NotificationEventType::TicketStatusChanged->value,
+            'event_type' => $this->eventType->value,
             'project' => [
                 'id' => $this->projectId,
                 'key' => $this->projectKey,
@@ -88,10 +99,26 @@ final readonly class TicketStatusChangedPayload implements NotificationEventPayl
                     'id' => $this->actorId,
                     'name' => $this->actorName,
                 ],
-            'from' => [
-                'id' => $this->fromStatusId,
-                'label' => $this->fromStatusLabel,
+            'assignee' => [
+                'from' => $this->fromAssigneeId === null || $this->fromAssigneeName === null
+                    ? null
+                    : [
+                        'id' => $this->fromAssigneeId,
+                        'name' => $this->fromAssigneeName,
+                    ],
+                'to' => $this->toAssigneeId === null || $this->toAssigneeName === null
+                    ? null
+                    : [
+                        'id' => $this->toAssigneeId,
+                        'name' => $this->toAssigneeName,
+                    ],
             ],
+            'from' => $this->fromStatusId === null || $this->fromStatusLabel === null
+                ? null
+                : [
+                    'id' => $this->fromStatusId,
+                    'label' => $this->fromStatusLabel,
+                ],
             'to' => [
                 'id' => $this->toStatusId,
                 'label' => $this->toStatusLabel,