feat(auth): add reset-password page and login success banner

app/(auth)/login/page.tsx

@@ -1,9 +1,19 @@
 // app/(auth)/login/page.tsx
 import { LoginForm } from '@/components/auth/login-form'
 
-export default function LoginPage() {
+interface Props {
+  searchParams: Promise<{ message?: string }>
+}
+
+export default async function LoginPage({ searchParams }: Props) {
+  const { message } = await searchParams
   return (
     <main className="min-h-screen flex items-center justify-center bg-gray-50 p-4">
+      {message === 'password_reset' && (
+        <div className="fixed top-4 left-1/2 -translate-x-1/2 bg-green-50 border border-green-200 text-green-700 text-sm rounded px-4 py-2 shadow">
+          Password updated — sign in with your new password.
+        </div>
+      )}
       <div className="bg-white rounded-xl shadow-sm border p-8 w-full max-w-sm">
         <LoginForm />
       </div>