Fix text overlap with markdown code block in list in agent response (#30377)

Seems that `h_full` was causing it to use the height of the overall list
item for some reason.

Closes #30002 

Release Notes:

- Agent Panel: Fixed text overlap for code blocks nested in lists in
agent response.
0abee5668aMichael Sloan committed on 5/9/2025, 12:48:16 PM· committed by GitHubparentc58b690
1 file changedLine totals unavailable