Closes #26631

Release Notes:

- Fixed markdown preview not rendering bullet points beginning with HTML

Before:
<img width="822" alt="before"
src="https://github.com/user-attachments/assets/102a7eac-fcc2-457b-9587-4a021800841d"
/>


After:
<img width="822" alt="after"
src="https://github.com/user-attachments/assets/8544b318-0efa-46c3-bd9b-c6c21444fab7"
/>

Note: I thought it would make sense to return `true` in `is_text_like`
for `Event::InlineMath` and `Event::DisplayMath` as well, but it looks
like rendering inline math is not supported at all at the moment:


https://github.com/zed-industries/zed/blob/4402e033a47db8ab6bf05623a9f111dc7b44cbd5/crates/markdown/src/parser.rs#L108