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/views.py

@@ -3080,6 +3080,7 @@ def _request_monthly_archive_generation(*, request, archive_type):
         stage='requested',
         year=year,
         month=month,
+        generated_archive=generated_archive,
     )
 
     try: