chore: Nuxt 4 upgrade (#7426)

frontend/app/layouts/basic.vue

@@ -0,0 +1,22 @@
+<template>
+  <v-app dark>
+    <TheSnackbar />
+
+    <AppHeader :menu="false" />
+    <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";
+import AppHeader from "@/components/Layout/LayoutParts/AppHeader.vue";
+import { useGlobalI18n } from "~/composables/use-global-i18n";
+
+useGlobalI18n(); // ensure i18n is initialized
+</script>