fix(mdx-loader): skip asset transformation for directory links with dots

[Dharya-dev]

Summary

Fixes a build error when a Markdown link points to a local directory that has a dot in its name (e.g., [link](../directory-with.dot/)).

Resolves #11940

Problem

path.extname("directory-with.dot/") returns ".dot", which is truthy. The transformLinks remark plugin interprets this as a file with an asset-like extension and calls toAssetRequireNode(). Since the target is actually a directory (not a file), Webpack's require() fails with:

Module not found: Error: Can't resolve './../directory-with.dot'

Fix

After getLocalFileAbsolutePath resolves the target path, I added a check using fs.stat() to see if the path is a directory. If it is, the asset transformation is skipped entirely and the link is left unchanged — which is the correct behavior for directory links.

Changes

• packages/docusaurus-mdx-loader/src/remark/transformLinks/index.ts — Added fs.stat() directory check before toAssetRequireNode()
• packages/docusaurus-mdx-loader/src/remark/transformLinks/__tests__/index.test.ts — Added two test cases covering directory links with dots (with and without trailing slash)
• __fixtures__/directory-with.dot/index.md — Test fixture directory

Test Results

 ✓ packages/docusaurus-mdx-loader/src/remark/transformLinks/__tests__/index.test.ts (12 tests) 169ms

 Test Files  1 passed (1)
      Tests  12 passed (12)

Let me know if any changes are needed!

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[Dharya-dev]

Closing in favor of @thanasis2028's PR #11944. Since they did the work first and I am closing the duplicate PR and offer support on the original one. Good luck getting it merged!