Receipt Photo Upload

HLF explicitly requires receipt photos for expense claims over 100 kr, necessary for internal compliance and external audit trails including Bufdir accountability. Without a digital capture mechanism, peer mentors must mail or scan paper receipts, introducing delays, loss risk, and manual coordinator effort to match receipts to claims. A camera-based upload integrated into the expense flow increases compliance: peer mentors capture the receipt at the moment of purchase rather than managing paper later. Coordinators gain instant access to supporting documentation in the approval queue, accelerating decision-making and reducing back-and-forth communication. The feature also supports Blindeforbundet's broader digitization strategy for volunteer workflows.

Use the Flutter image_picker package to access the device camera and photo library. Images are compressed client-side before upload to reduce bandwidth and storage costs. Upload targets a signed URL endpoint, storing files in cloud object storage with references saved to the expense_receipts table. The expense form conditionally requires a receipt attachment based on the claim amount and the org-configured threshold fetched at runtime. The Riverpod expense provider tracks upload state (pending, uploading, complete, error) and blocks form submission until a required receipt is attached. Offline queuing stores compressed image bytes in the Drift mutation outbox alongside the expense record; the image uploads when connectivity is restored before the expense syncs.