feat: calendar ZIP UX grouping, archive notification polling, service records pagination

- Group 'Preuzmi mjesečni izvještaj' and 'Preuzmi ZIP' buttons together in the calendar toolbar
- Close the ZIP modal immediately on action click so the user is no longer blocked in the sidebar
- Backend: include generated_archive_id in the 'requested' notification so the frontend can track the specific archive lifecycle
- Frontend: refresh notifications immediately after archive request and start targeted polling (every 10s) until a completed/failed notification arrives for that archive ID
- Add previous/next pagination to the service records table (page mode) when no service context is selected, showing all records 10 per page (matching the work orders table pattern)
- Tests: assert generated_archive_id is present in both requested and completed notifications

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

backend/modules/fleet/tests/test_work_order_images_endpoint.py

@@ -499,6 +499,10 @@ class WorkOrderImagesEndpointTests(TestCase):
         notifications = VehicleNotification.objects.filter(recipient=self.user).order_by('created_at')
         self.assertTrue(notifications.filter(metadata__entity_type='fleet_archive', metadata__stage='requested').exists())
         self.assertTrue(notifications.filter(metadata__entity_type='fleet_archive', metadata__stage='completed').exists())
+        requested_notification = notifications.filter(metadata__entity_type='fleet_archive', metadata__stage='requested').last()
+        completed_notification = notifications.filter(metadata__entity_type='fleet_archive', metadata__stage='completed').last()
+        self.assertEqual(str(requested_notification.metadata.get('generated_archive_id')), str(generated.pk))
+        self.assertEqual(str(completed_notification.metadata.get('generated_archive_id')), str(generated.pk))
 
     def test_monthly_service_tasks_archive_request_ignores_stale_cached_archive(self):
         stale = GeneratedFleetArchive.objects.create(
@@ -604,3 +608,10 @@ class WorkOrderImagesEndpointTests(TestCase):
                 metadata__stage='completed',
             ).exists()
         )
+        requested_notification = VehicleNotification.objects.filter(
+            recipient=self.user,
+            metadata__entity_type='fleet_archive',
+            metadata__archive_type='work_orders',
+            metadata__stage='requested',
+        ).order_by('created_at').last()
+        self.assertEqual(str(requested_notification.metadata.get('generated_archive_id')), str(generated.pk))