fix: sync multi-day work hours accounting

Aggregate task work-hour rows into travel-cost calculations and monthly servicer reporting, and keep the frontend calendar aligned with the task work-hours source.

backend/modules/task_management/serializers.py

@@ -91,6 +91,7 @@ class TaskSerializer(serializers.ModelSerializer):
     vehicle_owner_name = serializers.SerializerMethodField()
     vehicle_asset_type = serializers.SerializerMethodField()
     crane_serial_number = serializers.SerializerMethodField()
+    work_hours_table = serializers.SerializerMethodField()
     template_id = serializers.UUIDField(write_only=True, required=False, allow_null=True)
     auto_close_work_order = serializers.BooleanField(write_only=True, required=False)
 
@@ -100,7 +101,7 @@ class TaskSerializer(serializers.ModelSerializer):
             'id', 'title', 'description', 'status',
             'assigned_to', 'assigned_to_name',
             'vehicle', 'vehicle_registration', 'vehicle_make', 'vehicle_model',
-            'vehicle_owner_name', 'vehicle_asset_type', 'crane_serial_number',
+            'vehicle_owner_name', 'vehicle_asset_type', 'crane_serial_number', 'work_hours_table',
             'work_order', 'work_order_label',
             'scheduled_date',
             'service_report_note',
@@ -212,3 +213,9 @@ class TaskSerializer(serializers.ModelSerializer):
         if not obj.vehicle_id:
             return None
         return obj.vehicle.crane_serial_number or None
+
+    def get_work_hours_table(self, obj):
+        table = getattr(obj, 'work_hours_table', None)
+        if not table:
+            return None
+        return TaskWorkHoursTableSerializer(table).data

backend/modules/task_management/tests/test_serializers.py

@@ -2,7 +2,7 @@ from django.test import TestCase
 from modules.task_management.serializers import TaskSerializer
 from rest_framework.exceptions import ValidationError
 from django.contrib.auth import get_user_model
-from modules.task_management.models import Task
+from modules.task_management.models import Task, TaskWorkHoursTable
 from modules.fleet.models import Vehicle, WorkOrder
 from modules.crm.models import Client
 
@@ -86,6 +86,22 @@ class TaskSerializerTests(TestCase):
         assert serializer.data['vehicle_owner_name'] == 'Klijent zadatka'
         assert serializer.data['vehicle_asset_type'] == 'crane'
 
+    def test_work_hours_table_is_included_in_serialized_output(self):
+        task = Task.objects.create(title="Task work hours", assigned_to=self.user, vehicle=self.vehicle)
+        TaskWorkHoursTable.objects.create(
+            task=task,
+            data={
+                'rows': [
+                    {'date': '12.07.2026', 'work_hours': '8', 'travel_hours': '2'},
+                ]
+            },
+        )
+
+        serializer = TaskSerializer(instance=task)
+        assert serializer.data['work_hours_table']['data']['rows'][0]['date'] == '12.07.2026'
+        assert serializer.data['work_hours_table']['data']['rows'][0]['work_hours'] == '8'
+        assert serializer.data['work_hours_table']['data']['rows'][0]['travel_hours'] == '2'
+
     def test_scheduled_date_accepts_valid_date(self):
         serializer = TaskSerializer(
             data={"title": "Task mit datum", "status": "aktivan",