fix(parser): preserve inline comments inside nested selectors

[vardhan30016]

Summary

This PR fixes an issue where inline comments inside nested selectors were lost during parsing.

Changes

• Updated packages/less/src/less/parser/parser.js to correctly capture and preserve inline comments.
• Added test coverage to confirm that inline comments remain in the compiled output.

Testing

• Ran pnpm grunt test locally — all tests passed.
• Verified that nested selectors with inline comments retain comment text in compiled CSS.

Why this matters

Preserving inline comments improves readability in complex Less projects and maintains developer context when recompiled.

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Contributor: @vardhan30016 (Vardhan Naidu)