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)

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Co-authored-by: github-actions <[email protected]>

Author: simula-r