OptionalclassOptionalmode"preview" (default) renders properties read-only; "edit" makes the property widgets interactive and emits onPropertyChange.
OptionalonOptional close handler; when provided a close button is shown.
OptionalonCalled in edit mode when a property widget changes.
The selected element: "node" or "edge" and its ID, or null.
OptionalspecOptional spec controlling the widget used per property key.
Optionaltype12.11: surfaces that apply a custom EncodingSpec pass their own type -> color resolver (e.g. categoricalColorMap keyed by VALUE) so the panel's type chips match the graph exactly; the internal theme-palette map only matches the DEFAULT encoding.
The UGM instance to read data from.
CSS class for the container.