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.

agenciac_comia.sql

@@ -147,6 +147,7 @@ CREATE TABLE `users` (
   `name` varchar(255) NOT NULL,
   `email` varchar(255) NOT NULL,
   `password_hash` varchar(255) NOT NULL DEFAULT 'hash_placeholder',
+  `slug` varchar(255) UNIQUE DEFAULT NULL,
   `avatar_url` text,
   `role` enum('super_admin','admin','manager','agent') NOT NULL DEFAULT 'agent',
   `bio` text,