v1.52.0

Added

• headerHeight + setHeaderHeight on OnboardingProgressContext, and the useOnboardingHeaderHeight hook. The host-rendered ProgressBar is absolute-positioned, so its real footprint (top safe-area inset + bar + padding) was never available to step content. The bar now measures itself and publishes headerHeight (its full pixel footprint, including the inset it spans; 0 when hidden) so content can offset below it instead of guessing a fixed height. Consumers that already apply the top inset themselves should add only headerHeight - insets.top to avoid double-counting.

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