DONE bar above tracks mobile-dark happy-path artboards. Light / AMOLED / desktop / empty-loading-error variants for each screen are tracked separately in PROGRESS.md and will fill in once primary coverage clears 50/91. Themes swap live via the toggle in the top-right of every page. State persists in localStorage. Built with React 18 + babel-in-browser + a custom design-canvas component. First load on a large page takes ~15s while babel compiles. Precompile is a Session-N task.