LoadingModal

A full-screen SYSTEM overlay shown while a guard or entry definition is evaluating.

Automatically shown by evaluateWithThreshold when evaluation exceeds the configured loading threshold, and removed atomically once navigation commits.

Sits at the bottom of the SYSTEM layer (elevation = 0f) so that user-triggered SYSTEM modals (e.g. system alerts) always render above it.

Stacking order within RenderLayer.SYSTEM:

• LoadingModal → zIndex(9001f + 0f) = 9001f

• Normal SYSTEM Modal → zIndex(9001f + 1000f) = 10001f

Usage:

object AuthLoadingScreen : LoadingModal {
    override val route = "auth-loading"
    override val enterTransition = NavTransition.Fade
    override val exitTransition = NavTransition.FadeOut

    @Composable
    override fun Content(params: Params) { /* loading UI */}
}