fix(auth): adjust layout width for better responsiveness

- Updated the layout width in `AuthLayout` to a fixed width of 400px for improved consistency and user experience.

app/auth/layout.tsx

@@ -33,7 +33,7 @@ const AuthLayout = ({ children }: { children: React.ReactNode }) => {
         />
 
         <div className="relative z-10 flex min-h-[100dvh] w-full items-center justify-center p-4">
-          <div className="flex w-full max-w-md flex-col rounded-2xl bg-white/90 p-4 backdrop-blur-sm">
+          <div className="flex w-[400px] flex-col rounded-2xl bg-white/90 p-4 backdrop-blur-sm">
             <div className="flex min-h-[400px] flex-1 flex-col items-center justify-center">
               <Image
                 priority