Replay mouse playback and certified practice

What changed

• Full session replay now shows the candidate's mouse movement and clicks, and none of it feeds into a score. While paused, reviewers can click around the recorded workspace, and Play returns to the candidate's view.
• Anyone with an account can take a certified practice assessment on their own from My Assessments. It uses the same workspace and grading as a real assessment, and the result stays in their history.
• The candidates table now shows how much time each in-progress candidate has left, and switching tabs in candidate review no longer reloads the page. Recruiting Copilot can also reuse questions from your company's past assessments.