Add a deliberately small MVVM About screen: AboutViewModel exposes a StateFlow plus
plain public methods (onToggleMvvmNote) with NO Action sealed type and NO Event channel
— the explicit contrast to the app's MVI screens. AboutScreen collects state and calls
the VM method directly; links open via LocalUriHandler. Static showcase copy lives in
the VM as state to demonstrate the StateFlow-as-content shape. aboutGraph + @Serializable
AboutRoute + aboutPresentationModule wire it in. A code comment and the README explain
why this is MVVM and when each pattern fits.
Adrian Kuta
5f2792002b