feat: Next.js 14 web admin scaffold — auth, sidebar, dashboard, placeholders

components/providers.tsx

@@ -0,0 +1,14 @@
+'use client';
+
+import { QueryClientProvider } from '@tanstack/react-query';
+import { queryClient } from '@/lib/query-client';
+import { Toaster } from '@/components/ui/sonner';
+
+export default function Providers({ children }: { children: React.ReactNode }) {
+  return (
+    <QueryClientProvider client={queryClient}>
+      {children}
+      <Toaster />
+    </QueryClientProvider>
+  );
+}