Container
data class ContainerDecoration(val border: BorderStroke? = null, val borderRadius: Dp = 0.dp, val shadowElevation: Dp = 0.dp, val tonalElevation: Dp = 0.dp, val shape: Shape? = null, val gradient: Brush? = null, val foregroundColor: Color? = null, val fontSizeOverride: Float? = null)
Basic decoration metadata to keep parity with Flutter's BoxDecoration usage.