Developed and delivered the Osaka Jade Theme for the zed-industries/extensions repository, focusing on UI/UX design and front end development. The work introduced four theme variants—Dark, Soft, Muted, and Light—each supporting a full 16-color ANSI palette for seamless terminal integration. Leveraging TOML for configuration, the developer ensured all extension packaging requirements were met, including license compliance and metadata accuracy. Local testing validated consistent user experience and robust styling across all variants. This effort established a scalable theming framework, improved documentation alignment, and maintained repository hygiene, laying a strong foundation for future theme development and streamlined developer onboarding processes.