feat(nuxt): wrap #components client exports with createClientOnly

[huang-julien]

🔗 Linked issue

resolve nuxt/nuxt#14755 , related nuxt/nuxt#14868

❓ Type of change

• 📖 Documentation (updates to the documentation or readme)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

hi ! i'm not sure if this should be considered as bug fix or feature. This PR allow importing .client component as client only components when using explicit imports from #components. It also adds ServerPlaceholder as the .client server-side fallback if there's no .server component to avoid hydration issues.

📝 Checklist

• I have linked an issue or discussion.
• I have updated the documentation accordingly.

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[huang-julien]

convert to draft due to lazy loaded client components not being lazy loaded

[huang-julien]

Hi 👋 @danielroe @pi0
Importing from "#components" automatically break the tests due to BreakServer being exported in components.server.mjs.
It happens also on the edge channel.
Do you have any tips or solution to test this ? Maybe renaming BreakServer to BreakServer.client ? this shouldn't break the test of /client since the import is done with it's path.

[danielroe]

I'd be happy with renaming BreaksServer 👍 Would you confirm that this still preserve the integrity of the test? (That is, that if you set experimental.treeshakeClientOnly to false, the test breaks.)

[huang-julien]

setting treeshakeClientOnly to false does not break the tests 👍 (might need to rerun the ci juste to be sure but this does not throw any error locally). let me know what you think of this 🙂 .