I resolved a functionality issue with Lightbox2, where image links were opening in separate pages instead of displaying in the intended lightbox overlay. The problem was traced to build_blog.py, where HTML sanitization was stripping out the essential data-lightbox and data-title attributes required by Lightbox2. To fix this, I updated the ALLOWED_ATTRIBUTES configuration to preserve these specific attributes while retaining the overall security of the HTML sanitization. I then updated all relevant documentation files — CHANGELOG.md, CLAUDE.md, and ISSUES_AND_IMPROVEMENTS.md — to reflect this improvement in version 1.6.0, and committed and pushed the changes to the remote repository with a detailed commit message explaining the technical solution.