CSPaper: peer review sidekick

Now, we have released email sign-in https://cspaper.org/topic/141/release-note-2025-09-05-email-sign-in-sigir-2025-www-2025-my-review-page-enhancements-pdf-page-limit-relax-etc. Feel free to try it out: https://review.cspaper.org/

Important update: When users are not signed in, we will hide a part of the review after the streaming finish to drive for sign-in so that we can link a review to a user account. This will enable us to easily delete user review data.