Walk the retainer intake one question at a time

AIDA binds the retainer in one call, but a lawyer can also walk it by hand at /app/lawyer/notations/{notation_id}/step — one question per screen, the same focus-set chrome the client's own self-serve intake shares: a step list naming the whole chain, a progress bar, and the question's own control below it. A closed choice — the engagement's governing law, or a yes/no — renders as cards to choose between, not a bare checkbox or a compact radio list. Completed steps show as plain markers; there is no revisit route today.

The client-facing half of the same chain is /app/projects/{code}/intake/{notation_id} — the client confirms or corrects whatever the lawyer already entered, through the identical chrome.