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.

pages/Login.tsx

@@ -58,12 +58,6 @@ export const Login: React.FC = () => {
         <h2 className="mt-6 text-center text-3xl font-bold tracking-tight text-zinc-900 dark:text-zinc-50">
           Acesse sua conta
         </h2>
-        <p className="mt-2 text-center text-sm text-zinc-600 dark:text-dark-muted">
-          Ou{' '}
-          <Link to="/register" className="font-medium text-brand-yellow hover:text-yellow-600">
-            registre sua nova organização
-          </Link>
-        </p>
       </div>
 
       <div className="mt-8 sm:mx-auto sm:w-full sm:max-w-md">