Geoffroy Begouaussel focused on stabilizing the user interface for the 1024pix/pix-ui repository by addressing issues introduced with the FloatingUI integration in PixSelect components. He reverted the problematic integration, restoring the previous, reliable behavior for both PixSelect and PixSelectList, which prevented user-facing regressions and maintained a consistent experience. Working primarily with Ember.js, JavaScript, and Glimmer, Geoffroy coordinated with QA to validate the rollback and updated lightweight tests and documentation to reflect the changes. His work demonstrated careful attention to codebase stability and user experience, ensuring the UI remained robust while leaving room for future improvements to FloatingUI integration.