docs(GRO-1757): add SSO + OOBE test cases to groombook-web UAT_PLAYBOOK

Added §5.4.1 SSO Login Journey (TC-WEB-SSO-1 to 5) covering:
- SSO button visibility, Authentik redirect, valid credentials, post-login dashboard, user identity display

Added §5.4.2 OOBE Flow Post-Login (TC-WEB-OOBE-1 to 5) covering:
- Setup wizard on fresh DB, OIDC config, setup completion, admin panel access, SSO/OOBE interaction

Co-Authored-By: Paperclip <noreply@paperclip.ing>

UAT_PLAYBOOK.md

@@ -78,6 +78,26 @@ export const { signIn, signOut, useSession, changePassword } = authClient;
 | TC-AUTH-5.4.1 | Session persists across page reload | Sign in, reload page | Session remains active |
 | TC-AUTH-5.4.2 | Session clears on sign-out | Sign in, sign out | User is logged out, redirected to login |
 
+### 5.4.1 SSO Login Journey (Authentik OIDC end-to-end)
+
+| # | Scenario | Steps | Pass Criteria | Fail Criteria |
+|---|----------|-------|---------------|---------------|
+| TC-WEB-SSO-1 | Sign-in page shows SSO button | Navigate to app root URL | Sign-in page displayed with "Sign in with SSO" button visible | No SSO button, 403 before page loads |
+| TC-WEB-SSO-2 | Click SSO redirects to Authentik | Click "Sign in with SSO" button | Browser redirected to Authentik login at auth.farh.net | No redirect, error shown, button does nothing |
+| TC-WEB-SSO-3 | Valid OIDC credentials authenticate | At Authentik, enter valid credentials and authenticate | Redirected back to app with active session | Redirect loop, 403, session not established |
+| TC-WEB-SSO-4 | Post-login dashboard accessible | After SSO flow completes, dashboard loads | Dashboard displays correctly with user identity shown | Blank page, 403, session not active |
+| TC-WEB-SSO-5 | User identity displayed correctly | After SSO login, check header/nav | User name/email/initials shown in nav, role reflected in UI | No user indicator, wrong user shown |
+
+### 5.4.2 OOBE Flow Post-Login
+
+| # | Scenario | Steps | Pass Criteria | Fail Criteria |
+|---|----------|-------|---------------|---------------|
+| TC-WEB-OOBE-1 | Fresh DB shows setup wizard | On fresh DB (no super user), navigate to app | Setup wizard / OOBE screen displayed | Regular login page shown instead of setup |
+| TC-WEB-OOBE-2 | Configure OIDC via setup | During OOBE, configure OIDC auth provider via /api/setup/auth-provider | OIDC configured successfully, no 403 | 403 during setup, config rejected |
+| TC-WEB-OOBE-3 | Setup completes and redirects | Complete OOBE setup with business name | Redirected to app dashboard as super user, setup bypassed on reload | Setup errors, wrong redirect, setup reappears |
+| TC-WEB-OOBE-4 | Admin panel accessible after setup | After completing OOBE, navigate to admin panel | Admin features accessible | 403 on admin panel, insufficient permissions |
+| TC-WEB-OOBE-5 | SSO login during OOBE does not interfere | During fresh OOBE, attempt SSO login before completing setup | SSO login redirected appropriately, setup can still complete | Auto-provision creates staff prematurely, setup flow broken |
+
 ### 5.5 Dashboard
 
 | # | Scenario | Steps | Expected |