OptionalderivedIssue #17: the id of the definition that produced this value
(ugm.getDerivation(nodeId, key)?.definitionId). Set, the field
shows a "derived by" marker so a computed value does not read as
a measured one.
When true the widget is interactive; otherwise it is preview-only.
Property key (also used for the test id).
Display label.
OptionalonCalled with the coerced new value when an editable widget changes.
OptionaloptionsOptions for the select widget.
Current value.
Widget to render.
Theme accent, applied to interactive controls.