chore: indicate compatibility with new v4 major

[danielroe]

With Nuxt 4 on the horizon, this updates the module compatibility definition to allow it to be installed on Nuxt v4. (Otherwise Nuxt will indicate the module might not be compatible.)

When Nuxt v4 comes out then you might decide or need to make breaking changes in this module and release a new major, but hopefully the migration should be smoother. 🙏

👉 You can follow this and other changes in nuxt/nuxt#27613 - please feel free to provide feedback as well!

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[tobiasdiez]

Thanks @danielroe!

Since the storybook module integrates quite closely to nuxt internals (eg. we copy and modify nuxt's vite config), it is very likely that we are not compatible with v4 without further changes. Would you still recommend to add the compatibility tag?

Otherwise Nuxt will indicate the module might not be compatible.

I feel this might be more honest to the devs that are using the storybook module but are trying out nuxt v4.

[danielroe]

I would suggest testing with the new compatibility version: https://nuxt.com/docs/getting-started/upgrade#testing-nuxt-4.

Although we haven’t released v4 yet, this gives a good initial indication.

(For me, there were no red flags for this module in our change log, but obviously testing is safest.)

[tobiasdiez]

I've tested the v4 future flag over at #648 and it seems that there are indeed no problems. Awesome to see that migration to v4 will be much smoother than v2>v3, also thanks to your proactive PRs in modues.

So let's get this in.