Animation section for selection screen.

TimerScreen.kt

AnimatedContent(
            targetState = timerContent,
            transitionSpec = {
                if(targetState == TimerContent.SELECTION) {
                    slideInVertically { height -> height } + fadeIn() with
                            slideOutVertically { height -> -height } + fadeOut()
                } else {
                    slideInVertically { height -> -height } + fadeIn() with
                            slideOutVertically { height -> height } + fadeOut()
                }
            }
        ) {
            target ->
            if (target == TimerContent.SELECTION) {
                TimerSelectionScreen(
                    modifier = Modifier.fillMaxWidth(),
                    timeState = timeState,
                    onKeyClick = { key ->
                        timerViewModel.onEvent(
                            UiEvent.OnKeyPressed(key)
                        )
                    }
                )
            } else {
                TimerRunnerScreen(
                    modifier = Modifier.fillMaxWidth(),
                    onTimerStop = { key ->
                        timerViewModel.onEvent(
                            UiEvent.OnKeyPressed(key)
                        )
                    }
                )
            }
        }