Screen
fun ScreenHeader(modifier: Modifier = Modifier, onBack: () -> Unit? = null, backContentDescription: String? = null, subtitle: String? = null, subtitleMinLines: Int = 1, animateTitle: Boolean = true, actions: @Composable RowScope.() -> Unit = {}, title: EmphasisTextScope.() -> Unit)(source)
Header: an optional bare back arrow beside the title, the emphasis title, a muted subtitle directly under it, and optional trailing icon actions. subtitleMinLines reserves space so the header never shifts.