fix(build): avoid replacing unexpected words

[9romise]

🔗 Linked issue

vueuse/vueuse#5114

❓ 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

The default delimiters in @rollup/plugin-replace incorrectly matches variable names containing $, as shown in the linked issue where typeof window$1 was transformed into "undefined"$1, causing the subsequent error.
This PR narrows down the matching scope to prevent accidental matches with unexpected variables.

Before:
\btypeof window\b(?!\.) - https://regex101.com/r/1gkfNj/1

After:
\btypeof window(?![\w.$]) - https://regex101.com/r/cyyShK/1

📝 Checklist

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

[vercel]

@9romise is attempting to deploy a commit to the Nitro Team on Vercel.

A member of the Team first needs to authorize it.

[pi0]

@9romise can you please help adding a regression test to test/fixture/routes with problematic pattern?

[pkg-pr-new]

Open in StackBlitz

npm i https://pkg.pr.new/nitrojs/nitro@3671

commit: 6a29344

[9romise]

Sure, I'll add it later.

[pi0]

Thanks 👍🏼