Angular/UI_JSON work tracked in node/WEBUI_TASKS.md: one-time start tokens, session resume,
connection banner, busy indicator, field attributes (UPSHIFT, PICTURE, DEFAULT, REQUIRED,
INCLUDE, FORMAT), OPTIONS lines, DISPLAY ARRAY windowing, accessibility basics, ON KEY.
Driver fix: uilib_error never popped the attribute. npm test / npm run test:db and the
browser e2e scenarios, test programs under node/baseProgs.