TODO: Implement claim reward functionality in SubmissionDetail

[abrak01]

TODO Tracking — FrontEnd/my-app/components/submission/SubmissionDetail.tsx

Closes #297

TODO to resolve

Line	TODO
223	Implement claim reward functionality

Acceptance Criteria

• Claim reward button triggers the payout flow (calls /payouts/claim API)
• UI reflects pending/success/error states after claiming

Labels: frontend, maintenance, priority-low