v1.60.0

Added

• UIElement and UIElementSchema are now public. Both were module-private in steps/ComposableScreen/types.ts, where the step payload schema was their only consumer. They are exported from the new src/screens/types.ts and reachable from every existing import path. Purely additive — nothing was removed or renamed.
• ScreenElementsSchema — the elements array as a first-class, screen-agnostic schema, carrying the nested-KeyboardAvoidingView refinement that previously lived on the step payload. A caller parsing a full step still sees the same payload.elements issue path; the constraint simply belongs to the element tree rather than to steps, so a non-step screen can reuse it.

Changed

• Element schemas moved to src/screens/, ahead of the paywall work. src/steps/ComposableScreen/elements/* is now src/screens/elements/*, and the UIElement union lives in src/screens/types.ts. src/steps/ComposableScreen/types.ts remains as the onboarding step wrapper (BaseStepType + payload.elements) and re-exports everything screen-agnostic, so every existing import path — including the documented dist/steps/ComposableScreen/types.js payload-validation recipe — resolves unchanged. This is the headless half of extracting the rendering engine so it can serve both onboarding steps and paywall screens.

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