[docs] Fix pathname collision in LLMs docs generator

[siriwatknp]

Root Cause

Before: https://mui.com/material-ui/migration/upgrade-to-v7.md (show native color content which is wrong)

The findNonComponentMarkdownFiles() function uses findPagesMarkdown() which strips the filename from the path to create a "pathname". When multiple markdown files exist in the same directory, they produce identical pathnames:

docs/data/material/migration/upgrade-to-v7/
├── upgrade-to-v7.md          → pathname: /material/migration/upgrade-to-v7
└── upgrade-to-native-color.md → pathname: /material/migration/upgrade-to-v7  (collision!)

The find() method then returns the first alphabetically ordered file (upgrade-to-native-color.md), causing upgrade-to-v7.md to be generated with the wrong content.

Solution

Updated the file matching logic to use:

1. Filename basename match - Compare the actual filename (e.g., upgrade-to-v7)
2. Parent path verification - Ensure the file is in the expected directory

This prevents collisions while maintaining compatibility with the existing file structure.

Testing

Verified all 13 migration files generate with correct content:

• ✅ upgrade-to-v7.md → "Upgrade to v7" content
• ✅ upgrade-to-native-color.md → "Upgrade to native color" content

[mui-bot]

Netlify deploy preview

https://deploy-preview-47209--material-ui.netlify.app/

Bundle size report

Bundle	Parsed size	Gzip size
@mui/material	0B(0.00%)	0B(0.00%)
@mui/lab	0B(0.00%)	0B(0.00%)
@mui/system	0B(0.00%)	0B(0.00%)
@mui/utils	0B(0.00%)	0B(0.00%)

Details of bundle changes

Generated by :no_entry_sign: dangerJS against dd8c366e2c17574dbf41e91aaa98c35bfbd28051