I'am using an openai compatible model, but got nothing in agent thread
panel, and Zed log has "Model generated an empty summary" line.

I add one log to open_ai.rs:
<img width="2454" height="626" alt="图片"
src="https://github.com/user-attachments/assets/85354c7d-a0cc-4bba-86fd-2a640038a13e"
/>

and got:

<img width="3456" height="278" alt="图片"
src="https://github.com/user-attachments/assets/7746aedd-5d76-44b5-90f2-e129a1507178"
/>

It appear that `let line = line.strip_prefix("data: ")?;` can not handle
correctly.

Release Notes:

- N/A

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Co-authored-by: Ben Brandt <benjamin.j.brandt@gmail.com>