feat(mui): data/form kit — Modal, ConfirmDialog, DataTable, Field/SwitchField

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/admin/ui/index.ts

@@ -2,3 +2,8 @@ export { default as MuiProvider } from "./MuiProvider";
 export { default as Button } from "./Button";
 export { default as Card } from "./Card";
 export { default as TextField } from "./TextField";
+export { default as Modal } from "./Modal";
+export { default as ConfirmDialog } from "./ConfirmDialog";
+export { default as DataTable } from "./DataTable";
+export type { DataColumn } from "./DataTable";
+export { Field, SwitchField } from "./Field";