Fix: Extend the server proxy preset to also fetch SSG NuxtIslands

[brandondv]

📚 Description

This PR extends the preset for the server proxy, to also allow the fetching of NuxtIsland components from the dev server.

Standalone stories for NuxtIslands work fine. But when you have a component that has a NuxtIsland component in it, it won't render (properly) because it can't find the server only parts in the Storybook server. With this PR those routes are exposed and make the stories render.

There's one thing left to make NuxtIsland's work without any user changes needed: a Suspense wrapper, but I wasn't too sure if/where that should be enabled by default.

Reproduction stories

main...brandondv:nuxtjs-storybook:feature/child-nuxt-island-stories

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[tobiasdiez]

Thanks for the PR!

Could you please shortly explain how this nuxt proxy works? I was never able to really unravel why it is needed in the first place.

Could you also please add a story that uses an island in the showcase example, or is this too hard?

[chakAs3]

Could you please shortly explain how this nuxt proxy works? I was never able to really unravel why it is needed in the first place.

I used the proxy to serve files from the Nuxt dev server (port 3000) since Storybook runs on a separate dev server. This setup allowed components like NuxtImage and page routing to function properly. However, I wonder if there’s a better approach to consolidate everything into a single dev server.