chore: Nuxt 4 upgrade (#7426)

frontend/app/layouts/blank.vue

@@ -0,0 +1,26 @@
+<template>
+  <v-app dark>
+    <TheSnackbar />
+
+    <v-banner
+      v-if="$appInfo.demoStatus"
+      sticky
+    >
+      <div class="text-center">
+        <b> {{ $t("demo.info_message_with_version", { version: $appInfo.version }) }} </b>
+      </div>
+    </v-banner>
+
+    <v-main>
+      <v-scroll-x-transition>
+        <div>
+          <NuxtPage />
+        </div>
+      </v-scroll-x-transition>
+    </v-main>
+  </v-app>
+</template>
+
+<script setup lang="ts">
+import TheSnackbar from "~/components/Layout/LayoutParts/TheSnackbar.vue";
+</script>