Verify T3.4: Admin-only user role management screen

[Copilot]

Verification that the T3.4 admin-only user role management screen was fully and correctly implemented, per issue #23.

What exists

• app/admin/users/page.tsx — Server component; fetches all user_profiles + user_roles via createAdminClient() (service role, bypasses RLS); renders a responsive table with name, primary role badge, all assigned roles, WhatsApp, joined date, and action controls
• app/admin/actions.ts — Server actions: assignRole, removeRole, setPrimaryRole; each verifies the caller is an admin via requireAdmin(), validates role values, calls revalidatePath('/admin/users'), and removeRole guards against removing the last admin from the system
• app/admin/layout.tsx — Route-level guard; redirects unauthenticated users to /auth/sign-in and non-admins to /dashboard
• README.md — Already documents this screen as implemented

All acceptance criteria met

Criterion	Status
/admin/users server-rendered page	✅
Admin-only access (redirect non-admins)	✅
Table: name, primary role badge, all roles, WhatsApp, joined	✅
Add role dropdown form per user	✅
Remove role button per role	✅
Set primary role action	✅
Last-admin lockout guard	✅
Uses createAdminClient() throughout	✅
Server actions call revalidatePath	✅

Testing

• Verified locally
• Checked key flows manually

Notes

CI (lint → type-check → build) passes cleanly. No code changes were required — the implementation was already complete and correct.

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