Use dedicated assignee notification payload

tests/Feature/Notifications/DeliverNotificationActionTest.php

@@ -558,10 +558,6 @@ class DeliverNotificationActionTest extends TestCase
      *     project: array{id: int, key: string, name: string},
      *     ticket: array{id: int, key: string, title: string},
      *     actor: array{id: int, name: string},
-     *     assignee: array{
-     *         from: array{id: int, name: string}|null,
-     *         to: array{id: int, name: string}|null
-     *     },
      *     from: array{id: int, label: string},
      *     to: array{id: int, label: string},
      *     ticket_url: string,
@@ -586,10 +582,6 @@ class DeliverNotificationActionTest extends TestCase
                 'id' => 7,
                 'name' => 'Erica Example',
             ],
-            'assignee' => [
-                'from' => null,
-                'to' => null,
-            ],
             'from' => [
                 'id' => 1,
                 'label' => 'Backlog',

tests/Feature/Notifications/RenderDiscordMessageTemplateTest.php

@@ -3,8 +3,8 @@
 namespace Tests\Feature\Notifications;
 
 use App\Actions\Notifications\RenderDiscordMessageTemplate;
-use App\Actions\Notifications\TicketStatusChanged;
-use App\Actions\Notifications\TicketStatusChangedPayload;
+use App\Actions\Notifications\TicketAssigneeChanged;
+use App\Actions\Notifications\TicketAssigneeChangedPayload;
 use Carbon\CarbonImmutable;
 use PHPUnit\Framework\Attributes\DataProvider;
 use Tests\TestCase;
@@ -80,9 +80,9 @@ class RenderDiscordMessageTemplateTest extends TestCase
         $this->assertSame('[CORE-42] $unknown moved to Doing', $renderedMessage);
     }
 
-    private function event(): TicketStatusChanged
+    private function event(): TicketAssigneeChanged
     {
-        return new TicketStatusChanged(new TicketStatusChangedPayload(
+        return new TicketAssigneeChanged(new TicketAssigneeChangedPayload(
             projectId: 10,
             projectKey: 'CORE',
             projectName: 'Core Platform',

tests/Feature/Notifications/TicketAssigneeChangedNotificationDispatchTest.php

@@ -3,6 +3,7 @@
 namespace Tests\Feature\Notifications;
 
 use App\Actions\Notifications\DeliverNotificationAction;
+use App\Actions\Notifications\TicketAssigneeChangedPayload;
 use App\Actions\ProjectTicketMetadata\InitializeProjectTicketMetadata;
 use App\Actions\Tickets\Support\AcceptanceCriteriaChecklistMapper;
 use App\Enums\NotificationDeliveryStatus;
@@ -158,6 +159,7 @@ class TicketAssigneeChangedNotificationDispatchTest extends TestCase
             $payload = $job->event->payload();
 
             return $job->notificationActionId === $webhookAction->id
+                && $payload instanceof TicketAssigneeChangedPayload
                 && $payload->projectId === $project->id
                 && $payload->projectKey === 'CORE'
                 && $payload->projectName === 'Core Platform'
@@ -175,7 +177,7 @@ class TicketAssigneeChangedNotificationDispatchTest extends TestCase
                 && $payload->fromAssigneeName === 'Alex Analyst'
                 && $payload->toAssigneeId === $toAssignee->id
                 && $payload->toAssigneeName === 'Priya Planner'
-                && $payload->eventType === NotificationEventType::TicketAssigneeChanged
+                && $payload->toArray()['event_type'] === NotificationEventType::TicketAssigneeChanged->value
                 && $job->notificationDeliveryLogId !== null;
         });
         Queue::assertPushed(DeliverNotificationAction::class, fn (DeliverNotificationAction $job): bool => $job->notificationActionId === $discordAction->id