- Added comprehensive permission checks in perform_create()
- Created _check_item_edit_permission() helper method
- Updated perform_update() and perform_destroy() to use helper
- Permission logic now matches CanManageProcurementRequest:
* Admins/Staff can edit items in DRAFT requests
* Users with change_procurementrequest permission
* Request author can edit their own requests
* Department head can edit requests from their department
- Fixes 403 Forbidden error when creating/editing/deleting items
- Обновлены иконки статусов в dashboard.html и request_list.html
- Все статусы теперь используют одинаковые иконки и стили
- Добавлены функции getStatusBadgeHTML() для динамического рендеринга
- Исправлена синтаксическая ошибка в loadRequests()
- Статусы: draft, pending, approved, rejected, in_progress, completed, cancelled
