@gridkitjs/core v0.8.0

388def3: moveGroupByBefore/movesGroupBy — the group-by counterpart of moveColumnBefore/movesColumn, positioning a column within GroupByState in front of another, or inserting it fresh if it isn't grouped yet. Backs the new drag-a-header-into-the-group-by-bar and drag-a-chip-to-reorder interactions in @gridkitjs/react.

ColumnDefinition gains groupByDraggable (whether a column's header may be dragged into the group-by bar) and groupToggleIcon (whether a groupable header shows its group-toggle icon), mirroring sortable/reorderable. ColumnResolveOptions/ResolvedColumn gain the matching groupByDraggable field.
388def3: Row grouping primitives: groupRows reshapes filtered/sorted rows into a flat, depth-first list of group headers and data rows, stacked outer-to-inner by a GroupByState. New exports: groupRows, groupRowId, toggleGroupExpansion, expandAllGroups, collapseAllGroups, and the types GroupByState/GroupByEntry/GroupByEvent/GroupExpansionState/GroupExpansionEvent/ResolvedGroupRow/DisplayRow. ColumnDefinition gains a groupable field, mirroring sortable.

Breaking: KeyShortcutCapabilities (consumed by buildKeyShortcuts) gains a required groupable: boolean field.