During July 2025, contributed a focused update to the samqin123/md repository by enhancing the editor’s usability and reliability. Developed and integrated undo and redo functionality using CodeMirror, configuring a fixed history depth of 200 to ensure consistent error correction and editing flow. Added intuitive menu items and toolbar buttons, improving accessibility for end users and streamlining the editing experience. All changes were implemented with TypeScript and Vue.js, emphasizing robust state management and UI/UX best practices. The work established a scalable foundation for future editor enhancements, with clear commit traceability and a thoughtful approach to maintainability and user-centric design.