- Deleted the `authorization-rbac.spec.ts` file and integrated its tests into `authorization-rbac.spec.ts` for better organization.
- Simplified user credential definitions and login function.
- Enhanced error handling in the login function.
- Streamlined test cases for admin, user, and guest roles, ensuring consistent header usage.
- Improved readability by reducing unnecessary comments and consolidating similar assertions.
- Updated session-based access control tests to ensure clarity and maintainability.
