refactor(adminfront): replace sonner with custom use-toast matching devfront UX policy

adminfront/src/features/user-groups/routes/UserGroupDetailPage.tsx

@@ -3,7 +3,7 @@ import type { AxiosError } from "axios";
 import { ArrowLeft, Shield, Trash2, UserPlus, Users } from "lucide-react";
 import { useState } from "react";
 import { Link, useParams } from "react-router-dom";
-import { toast } from "sonner";
+import { toast } from "../../../components/ui/use-toast";
 import { Badge } from "../../../components/ui/badge";
 import { Button } from "../../../components/ui/button";
 import {
@@ -189,7 +189,7 @@ export function UserGroupDetailPage() {
           <p>
             Error:{" "}
             {(error as AxiosError<{ error?: string }>)?.response?.data?.error ||
-              error.message ||
+              (error as any)?.message ||
               "Not found"}
           </p>
         </div>