Worked on enhancing the cross-document clipboard functionality in the AFFiNE repository, focusing on ensuring reliable copy and paste operations between documents and external applications. Leveraged TypeScript and front end development skills to stabilize clipboard snapshot handling, reducing failures and improving user productivity. Implemented comprehensive regression tests to validate clipboard behavior and strengthened error handling in paste flows, resulting in clearer failure reporting and increased resilience. The work also improved code health and maintainability around clipboard-related logic. This feature-driven contribution demonstrated a methodical approach to reliability and test coverage, addressing a key aspect of user experience in a full stack TypeScript environment.