feat: dodaj mjesecni izvjestaj servisera i troskova u kalendar widget

- Dva nova Django API endpointa (GET /api/fleet/reports/monthly-servicer/ i
  /api/fleet/reports/monthly-costs/) koji generiraju DOCX u A4 landscape formatu
- TaskCalendarWidget prosiren s report panelom: dva gumba iznad kalendara
  (Izvjestaj servisera / Izvjestaj troskova) sirenjem drawer-a na 680 px
- Preview tablice s podacima iz postojeceg tasks/workOrders store-a
- downloadMonthlyServiserReport i downloadMonthlyCostsReport u store-u
- TaskCalendarPortal prosljeduje activeWorkOrders prop widgetu

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

backend/modules/fleet/urls.py

@@ -3,6 +3,7 @@ from django.urls import path
 from .views import (
     CraneViewSet, VehicleViewSet, WorkOrderViewSet, VehicleServiceRecordViewSet,
     WorkOrderInvoiceViewSet, ServiceContextNoteViewSet, VehicleNotificationViewSet, VehicleServicePhotoViewSet, VehicleServiceAttachmentViewSet, pusher_auth,
+    monthly_servicer_report_docx, monthly_costs_report_docx,
 )
 
 router = DefaultRouter()
@@ -20,4 +21,6 @@ urlpatterns = router.urls
 
 urlpatterns += [
     path('pusher-auth/', pusher_auth, name='pusher-auth'),
+    path('reports/monthly-servicer/', monthly_servicer_report_docx, name='monthly-servicer-report'),
+    path('reports/monthly-costs/', monthly_costs_report_docx, name='monthly-costs-report'),
 ]