Use nuxt preview composable to make sure that fetching is done properly

[SebbeJohansson]

Description

Hi! Nuxt has added a new composable called usePreviewMode to force refetching when in a prerendered page. I think storyblok can benefit from using this new built in composable.

nuxt/nuxt#21705

Suggested solution or improvement

Use nuxt/nuxt#21705

Additional context

No response

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