fix: add typeFrom support for autoimports exports generation

[8ctavio]

🔗 Linked issue

#3669 part 2

❓ 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

PR #3670 added imports' typeForm support for global declarations; this PR adds typeFrom support for autoimports' export statements, so that explicit imports from #imports may also find type declarations.

Inside the writeTypes function, toExports call is updated to use imports' typeFrom property when available (see unjs/unimport#477).

📝 Checklist

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

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