improvement: task assignment notif added to notifications feature.

backend/src/modules/cases/cases.service.ts

@@ -486,13 +486,20 @@ export class CasesService {
       },
     });
 
-    if (assigneeUserId && assigneeUserId !== actorUserId) {
+    if (assigneeUserId) {
+      await this.labCaseActivity.record({
+        labCaseId,
+        type: LabCaseActivityType.TASK_ASSIGNED,
+        actorUserId,
+        payload: { taskId, assigneeUserId },
+      });
+
       void this.userNotifications.notify({
         organizationId: labOrganizationId,
         type: UserNotificationType.TASK_ASSIGNED,
         href: `/tasks?taskId=${encodeURIComponent(taskId)}&labCaseId=${encodeURIComponent(labCaseId)}`,
         actorUserId,
-        payload: { labCaseId, taskId },
+        payload: { labCaseId, taskId, assigneeUserId },
         recipientUserIds: [assigneeUserId],
       });
     }