[Enhancement] Approve / reject flow with reason capture

[techifydev1]

Decision actions on verification detail:

• approve: single confirm, applies verified role/badge via API
• reject: requires selecting a reason category + free-text note
• rejection reasons should be a maintained constant list (lib/) so we get clean analytics later

On success, toast + redirect back to queue with the row gone. Handle 409-style conflicts (someone else already decided) gracefully: show current status instead of erroring out.