remember
fun rememberMaterialPlaceholderTheme(color: Color = MaterialTheme.colorScheme.surfaceVariant, highlightColor: Color = MaterialTheme.colorScheme.onSurface.copy(alpha = 0.3f), shape: Shape = RectangleShape): PlaceholderTheme
Remembered variant of materialPlaceholderTheme for cases where you want to capture the theme once and reuse it (e.g. across multiple ProvidePlaceholderTheme boundaries).