As a user (any type), I want to be able to log in and out of the system securely, So that I can access my personalized dashboard and my data is protected.
Acceptance Criteria:
Given I am on the login page, I can enter my username and password.
Given I enter incorrect credentials, I see a clear error message.
Given I log in successfully, I am redirected to my role-specific dashboard (User, Agent, or Admin). Given I am logged in, I can see a "Logout" button to end my session.