- Add dashboard approvals APIs and route handlers for listing requests, fetching detail, and submitting approve/deny decisions
- Emit approval SSE events and subscribe mailbox refresh logic to keep approval lists and badges live
- Extend Mailbox view with an Approvals tab, pending/history filters, request detail history, and approve/deny actions
- Update mailbox styles, approval route tests, and docs for the new approvals workflow
Fusion-Task-Id: FN-3549
070421c0ab