fix(nuxt): useCookie with defaults should return non-null value

[danielroe]

🔗 Linked issue

#8769 (comment)

❓ 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

This reverts the previous change in linked PR, allowing user to choose whether or not the cookie should be nullable by providing a generic type. This is a type-breaking change and should likely occur in a minor release rather than a major one.

👉 Migration

If you were relying on the default nullable behaviour, you can pass a generic instead:

- useCookie('test', () => 'something').value = null
+ useCookie<string | null>('test', () => 'something').value = null

📝 Checklist

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

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