The per-screen Modifier.predictiveBack scaled the leaving screen with a
graphicsLayer, but NavHost only composes one back-stack entry at a time, so
nothing was drawn behind the shrinking screen — the gesture revealed the white
window background instead of the previous screen.
Drive predictive back through navigation-compose instead: it composes the
destination being revealed and seeks popExit with the gesture. popExit is now a
scaleOut + fade peek, so the leaving screen shrinks to reveal the real previous
screen held static. Drops the predictiveBack modifier from the destinations and
Settings (its inner section BackHandler is unchanged). The kit's predictiveBack
stays for overlay-style screens.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Jean-Luc Makiola
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