- Backend: GET /api/export/{tasks,users,activities}?month=YYYY-MM
- Frontend: Export panel on Reports page (CEO/CTO/Manager only)
- API: apiExportCsv helper for browser download
- Backend: GET /api/export/{tasks,users,activities}?month=YYYY-MM
- Frontend: Export panel on Reports page (CEO/CTO/Manager only)
- API: apiExportCsv helper for browser download