fix(nuxt): clone cookie to detect changes within object

[danielroe]

🔗 Linked issue

resolves #24969

❓ Type of change

• 📖 Documentation (updates to the documentation, readme or JSdoc annotations)
• 🐞 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)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

When a cookie is an object, changing a property within it will change the original referenced object as well, meaning isEqual doesn't detect the change. Instead, we can clone the value straight away so we can detect differences.

📝 Checklist

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

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[manniL]

The whole stream approves 😛