feat(mobile-nav): enhance responsive sidebar with user info and auth actions

- Remove userRole prop, read user directly from auth store
- Add user info section (avatar, name, email) when logged in
- Add Masuk/Daftar buttons at bottom when unauthenticated
- Add Keluar button with loading state when authenticated
- Add tagline under logo in sidebar header
- Add backdrop blur effect for better visual depth
- Use flex-col layout for consistent spacing at any height

apps/web/src/pages/login-page.tsx

@@ -28,7 +28,7 @@ export function LoginPage() {
 
   return (
     <main className="flex min-h-screen items-center justify-center px-6 py-12">
-      <div className="w-full space-y-4">
+      <div className="w-full max-w-sm md:max-w-md space-y-4">
         <AuthForm
           mode="login"
           isSubmitting={mutation.isPending}