Use readonly for layout composable

src/views/pages/auth/Login.vue

@@ -1,14 +1,14 @@
 <script setup>
 import { useLayout } from '@/layout/composables/layout';
-import { ref, computed } from 'vue';
+import { computed, ref } from 'vue';
 
-const { layoutConfig } = useLayout();
+const { isDarkTheme } = useLayout();
 const email = ref('');
 const password = ref('');
 const checked = ref(false);
 
 const logoUrl = computed(() => {
-    return `/layout/images/${layoutConfig.darkTheme.value ? 'logo-white' : 'logo-dark'}.svg`;
+    return `/layout/images/${isDarkTheme ? 'logo-white' : 'logo-dark'}.svg`;
 });
 </script>