Entry point for building user interfaces with the JUI framework (Java-to-JavaScript UI). Use this skill whenever doing any front-end / UI work in a JUI application: building screens, pages, panels, dialogs, forms, tables, galleries, navigation, or any reusable UI element — and when you need to know what JUI offers, which kind of artefact to build, what standard controls/components/fragments already exist, or how to inspect the JUI source. Routes to the specialised jui-components, jui-controls, jui-fragments and jui-styles skills. Triggers include: JUI, UI, building a screen/page/panel/form/dialog/table/gallery, SimpleComponent, Control, Fragment, DomBuilder, ControlForm, TabNavigator, or 'how do I do X in the UI'.