Inconsistent Virtual Text Placement with Tabs

Hi,
I'm encountering an issue with llm.nvim where virtual text is not correctly aligned when lines start with a tab character. Specifically, virtual text intended to be aligned with the cursor position defaults to column 1 when the line begins with a tab, whereas it aligns correctly when the line starts with spaces.


I digged into the source code and found the `col` came from llm-ls, I'm not sure if it's a bug of llm.nvim.