feat: show vue node settings toggle and show banner to switch back (#6382)

## Summary

- When switching from litegraph to vue nodes, show a toast that opens
settings to switch back
- Show a toggle in settings under Vue nodes for now called Modern Node
Design (Vue Nodes)
- Plan to update all the nomenclature as we get closer to GA

## Screenshots (if applicable)

<img width="1480" height="911" alt="image"
src="https://github.com/user-attachments/assets/fa3a34b9-2631-4175-917a-aa319f9fe415"
/>

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6382-feat-show-vue-node-settings-toggle-and-show-banner-to-switch-back-29b6d73d365081d29252c83349f06c0a)
by [Unito](https://www.unito.io)

---------

Co-authored-by: github-actions <github-actions@github.com>

src/components/toast/VueNodesMigrationToast.vue

@@ -0,0 +1,48 @@
+<template>
+  <Toast
+    group="vue-nodes-migration"
+    position="bottom-center"
+    class="w-auto"
+    @close="handleClose"
+  >
+    <template #message>
+      <div class="flex flex-auto items-center justify-between gap-4">
+        <span class="whitespace-nowrap">{{
+          t('vueNodesMigration.message')
+        }}</span>
+        <Button
+          class="whitespace-nowrap"
+          size="small"
+          :label="t('vueNodesMigration.button')"
+          text
+          @click="handleOpenSettings"
+        />
+      </div>
+    </template>
+  </Toast>
+</template>
+
+<script setup lang="ts">
+import { useToast } from 'primevue'
+import Button from 'primevue/button'
+import Toast from 'primevue/toast'
+import { useI18n } from 'vue-i18n'
+
+import { useVueNodesMigrationDismissed } from '@/composables/useVueNodesMigrationDismissed'
+import { useDialogService } from '@/services/dialogService'
+
+const { t } = useI18n()
+const toast = useToast()
+const dialogService = useDialogService()
+const isDismissed = useVueNodesMigrationDismissed()
+
+const handleOpenSettings = () => {
+  dialogService.showSettingsDialog()
+  toast.removeGroup('vue-nodes-migration')
+  isDismissed.value = true
+}
+
+const handleClose = () => {
+  isDismissed.value = true
+}
+</script>