feat: complete UI/UX refinement, email flow updates, and deep black theme

- Updated all email templates to a clean light theme and changed button text to 'Finalizar Cadastro'.

- Enforced a strict 15-minute expiration on all auth/reset tokens.

- Created SetupAccount flow distinct from ResetPassword to capture user name during admin init.

- Refined dark mode to a premium True Black (Onyx) palette using Zinc.

- Fixed Dashboard KPI visibility and true period-over-period trend logic.

- Enhanced TeamManagement with global tenant filtering for Super Admins.

- Implemented secure User URL routing via slugs instead of raw UUIDs.

- Enforced strict Agent-level RBAC for viewing attendances.

types.ts

@@ -12,6 +12,7 @@ export interface User {
   tenant_id: string;
   name: string;
   email: string;
+  slug?: string;
   avatar_url: string;
   role: 'super_admin' | 'admin' | 'manager' | 'agent';
   team_id: string;