Travel Expense Registration

Peer mentors are volunteers whose continued participation depends on timely, accurate reimbursement of out-of-pocket travel costs. Manual processes - paper forms, email attachments, Excel aggregation - create friction that discourages reporting and delays payment, eroding trust and volunteer retention over time. Digitising expense registration inside the same app used for activity logging removes a separate administrative burden and ensures data completeness for downstream accounting exports. The auto-approval threshold eliminates unnecessary manual steps for small, routine claims, freeing coordinators to focus on exceptions that genuinely require their review and sign-off.

Implemented as a dedicated expense registration flow in Flutter using Riverpod state management and Drift for offline-first persistence. Records sync to the backend REST API and are stored in the `expenses` table with foreign keys to `users`, `expense_types`, and `expense_receipts`. Auto-approval logic runs server-side: claims below the configured kilometre threshold with no attached receipts are approved automatically; others enter the Admin Web Portal queue. Accounting export integration (Xledger for Blindeforbundet, Dynamics for HLF) is handled by the `admin-accounting` area and consumes approved expense records from this table.