LinearOnboardingTransition

End the entire flow as Skipped and clear the whole frame stack.

Move to the next eligible step in the current plan. If none are left, the run completes through the root plan.

Pop the top frame and advance the caller past the step that pushed it.

Push a new frame and run plan from its first eligible step. The caller only resumes if the side plan ends with ReturnAndAdvance. If the side plan runs past its last step without a ReturnAndAdvance, the whole run completes through the root plan.