Interviews ask 'anything else?' before wrapping up

• Interviewer now asks "anything else?" before the summary confirmation, so participants get a chance to add anything they missed.
• Tightened the closing flow so the interview only ends after all closing steps are complete, and the final message is always a statement rather than a question participants can't answer.

Prevented interviews from ending prematurely. Previously the closing message could contain a question participants had no way to respond to.