feat(mui): ConfirmDialog optional children (extra content below message)

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

src/admin/ui/ConfirmDialog.tsx

@@ -1,4 +1,4 @@
-import { useState } from "react";
+import { useState, type ReactNode } from "react";
 import Dialog from "@mui/material/Dialog";
 import DialogTitle from "@mui/material/DialogTitle";
 import DialogContent from "@mui/material/DialogContent";
@@ -17,6 +17,8 @@ export interface ConfirmDialogProps {
   cancelText?: string;
   confirmVariant?: "primary" | "danger";
   loading?: boolean;
+  /** Optional extra content rendered below the message (e.g. a checkbox). */
+  children?: ReactNode;
 }
 
 /** Confirmation dialog over MUI Dialog. Preserves the legacy ConfirmModal prop shape. */
@@ -30,6 +32,7 @@ export default function ConfirmDialog({
   cancelText = "Zrušit",
   confirmVariant = "primary",
   loading = false,
+  children,
 }: ConfirmDialogProps) {
   useDialogScrollLock(isOpen);
   // Freeze content + label + loading while open, so neither the message NOR the
@@ -59,6 +62,7 @@ export default function ConfirmDialog({
       <DialogTitle>{shown.title}</DialogTitle>
       <DialogContent>
         <DialogContentText>{shown.message}</DialogContentText>
+        {children}
       </DialogContent>
       <DialogActions sx={{ px: 3, pb: 2 }}>
         <MuiButton onClick={onClose} color="inherit" disabled={shown.loading}>