fix(types): emit auto-import paths as files, not directories

[danielroe]

🔗 Linked issue

remake of #4333 for v2

❓ 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

duplicate description for posterity:

writeTypes emits const foo: typeof import('<path>').foo per auto-imported binding

for some packages, the path ends up being the package directory rather than a file; this works fine for TypeScript with moduleResolution: bundler, but Deno's TS host doesn't apply Node directory resolution to relative specifiers and bails

this PR treats ./ the same as an empty subpath & falls back to resolvedPath, which ends up having its extension stripped

both typescript + deno should resolve this equally well.

note: packages with different exports.types vs exports.imports (eg #2384) won't work correctly, either before or after this fix (but the error slightly changes 😆)

📝 Checklist

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

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