feat(org-chart): support standalone React integration and update guides

packages/org-chart-react/src/hm-dialog.tsx

@@ -0,0 +1,14 @@
+"use client";
+
+import { OrgChart as CoreOrgChart } from './OrgChart.js';
+import HMEmployeeDialog from './HMEmployeeDialog.js';
+import type { OrgChartProps } from './types.js';
+
+/** HM integration is explicit at the import and popup setting boundaries. */
+export function OrgChart(props: OrgChartProps) {
+  return <CoreOrgChart {...props} employeePopupAdapter={props.employeePopupAdapter ?? HMEmployeeDialog} />;
+}
+
+export { HMEmployeeDialog };
+export type { OrgChartProps, OrgChartEmployeeSelection, OrgChartEmployeePopupProps } from './types.js';
+export type * from '@hm-design/org-chart';