Follow-up questions and fuller approval cards

What changed

• A question can now continue the one before it. The candidate's workspace opens on the app they just built, and the evidence for the new question covers only what they add.
• Recruiting Copilot approval cards now name each new question in order, show any mockup being added, and state the cost per candidate. If you ask for changes before approving, Copilot replaces the card with a revised one.
• Recruiting Copilot and Educator Copilot now take algorithmic problems from the tested problem library. Educator Copilot cards also show what you are approving, such as an assignment's problems and due date or a quiz's questions with the correct answers marked.