Currently, the Perspective login screen is not project-based, which means dynamic control via session.props.theme is not possible. The login screen inherits static Gateway branding (logo, colors, etc.), and developers have no access to override or apply project-level themes. This limitation prevents the login screen from following runtime theme changes such as night mode, leading to inconsistent user experience across HMI projects. It would be useful if the login screen could inherit project-level or session-based themes to ensure consistent styling across all views.