SvPivotDesigner: self-contained, enterprise-ready pivot authoring with a left-rail field picker (search + grouped), four drop wells (Filters / Columns / Rows / Values), drag-and-drop between wells, per-chip aggregator + filter menus, presets toolbar, and an inline pivot grid driven by createPivotModel. Single bindable `layout` prop so the page can persist or restore it. (requires @svgrid/enterprise)