Niza enhanced the helix-editor/helix repository by improving the Catppuccin Mocha theme’s handling of diagnostics, focusing on UI and readability. She introduced a dim modifier to the diagnostic.unnecessary highlight in the catppuccin_mocha.toml configuration, allowing unnecessary diagnostics to be visually distinguished from others. This theme customization, implemented using TOML and configuration management skills, addressed the need for clearer, more scannable diagnostic information for developers working across codebases. While the work was scoped to a single feature and did not involve bug fixes, it laid a foundation for future theme-driven diagnostic styling and consistency within the helix-editor’s theming system.