🐛 [md] Incorrect parsing of sub lists

[ematipico]

Environment information

main

What happened?

The following markdown is incorrectly parsed

* Text

 	- foo
 	- lreum
 	- bar

https://biomejs.dev/playground/?lintRules=useVueConsistentDefinePropsDeclaration&tab=syntax&pane=Console&code=CgAqACAAVABlAHgAdAAKAAoAIAAJAC0AIABmAG8AbwAKACAACQAtACAAbAByAGUAdQBtAAoAIAAJAC0AIABiAGEAcgAKAA%3D%3D&language=md

The nested list is parsed as a normal paragraph.

Expected result

It should be parsed as a bullet list

https://spec.commonmark.org/dingus/?text=foo%5C%0Abaz%0A

cc @jfmcdowell

Code of Conduct

• I agree to follow Biome's Code of Conduct

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[xsourabhsharma]

I’d be happy to work on a fix for this. Could you please assign it to me?

[ematipico]

@xsourabhsharma send a PR, we don't assign issues

[xsourabhsharma]

now working on this wait

[jfmcdowell]

I dug into this: the failure is in tab-to-column handling during list-item continuation. For \t- foo, the indent expands to column 4, so it should attach under the parent item and open a nested list, not become lazy paragraph continuation.

I also added fuzzer coverage in #10594. It only updates the corpus generator, and the generated cases should pass once the parser fix lands. @xsourabhsharma feel free to use that branch to validate your fix.