Handle expired sessions and clean backend errors

src/app/admin/dashboard/page.tsx

@@ -2,6 +2,7 @@
 
 import Link from "next/link";
 import { useEffect, useState } from "react";
+import { getBackendErrorMessage } from "@/lib/error-message";
 
 interface AdminQueueItem {
   id: string;
@@ -54,7 +55,7 @@ export default function AdminDashboardPage() {
         });
         const result = await res.json();
         if (!res.ok) {
-          throw new Error(result?.responseDesc || result?.error || "Failed to load admin dashboard");
+          throw new Error(getBackendErrorMessage(result, "Failed to load admin dashboard"));
         }
         setData(result);
       } catch (err) {