Hoist the flag, not the animation

A shell that owns "are the overlay controls showing?" is right. A shell that owns "…and here is the alpha, already tweened" has quietly made a design decision on behalf of every look that will ever render.

// adapted — derived inside the look, from the shell's boolean
val controlsAlpha by animateFloatAsState(
    targetValue = if (state.showControls) 1f else 0f,
    animationSpec = tween(durationMillis = if (state.showControls) 180 else 500, easing = LinearEasing),
)

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