fix(nuxt): merge and apply layer hooks

[danielroe]

🔗 Linked issue

#13367

❓ 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

Rather than relying on c12 to merge hooks, this simply iterates over layers to ensure all layer hooks are merged/respected in the final hookable instance.

We reverse the layer order to ensure that final user hooks run last, with layer hooks being added first.

📝 Checklist

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

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (main@88498be). Click here to learn what that means.

Additional details and impacted files

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  Coverage        ?   58.65%           
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  Files           ?        5           
  Lines           ?      861           
  Branches        ?       46           
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  Hits            ?      505           
  Misses          ?      356           
  Partials        ?        0           

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