feat: proširi prikaz dizalice i vlasnika u zadacima

Dodaj detalje dizalice (proizvođač, model i SN) te vlasnika u modal radnog zadatka i kalendar zadataka, uz zajednički frontend helper za DRY prikaz.

Proširi Task API serializer dodatnim poljima za prikaz dizalice/vlasnika i ažuriraj testove serializera za nova izlazna polja.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

backend/modules/task_management/tests/test_serializers.py

@@ -4,13 +4,23 @@ from rest_framework.exceptions import ValidationError
 from django.contrib.auth import get_user_model
 from modules.task_management.models import Task
 from modules.fleet.models import Vehicle, WorkOrder
+from modules.crm.models import Client
 
 
 class TaskSerializerTests(TestCase):
     def setUp(self):
         User = get_user_model()
         self.user = User.objects.create_user(username="task-user-base", email="task-user-base@example.test", password="pass")
-        self.vehicle = Vehicle.objects.create(registration_number="ZG-TSK-01", asset_type='crane')
+        self.client = Client.objects.create(name="Klijent zadatka")
+        self.vehicle = Vehicle.objects.create(
+            registration_number="ZG-TSK-01",
+            asset_type='crane',
+            make='Liebherr',
+            model='LTM',
+            crane_serial_number='123456',
+            client=self.client,
+            is_company_vehicle=False,
+        )
 
     def test_validate_title_too_short_raises(self):
         serializer = TaskSerializer(data={"title": "ab", "description": "", "status": "aktivan", "vehicle": str(self.vehicle.id)})
@@ -67,6 +77,15 @@ class TaskSerializerTests(TestCase):
         serializer = TaskSerializer(instance=task)
         assert serializer.data['scheduled_date'] is None
 
+    def test_vehicle_details_are_included_in_serialized_output(self):
+        task = Task.objects.create(title="Task crane details", assigned_to=self.user, vehicle=self.vehicle)
+        serializer = TaskSerializer(instance=task)
+        assert serializer.data['vehicle_make'] == 'Liebherr'
+        assert serializer.data['vehicle_model'] == 'LTM'
+        assert serializer.data['crane_serial_number'] == '123456'
+        assert serializer.data['vehicle_owner_name'] == 'Klijent zadatka'
+        assert serializer.data['vehicle_asset_type'] == 'crane'
+
     def test_scheduled_date_accepts_valid_date(self):
         serializer = TaskSerializer(
             data={"title": "Task mit datum", "status": "aktivan",