Fixed size for pending thoughts

[dawoodkhan82]

Description

Shows a fixed size box when thought messages are pending (5 lines). Since we now show a "preview", expanded is false by default.

Untitled.mov

Closes: #(issue)

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[gradio-pr-bot]

🪼 branch checks and previews

•	Name	Status	URL
	Spaces	ready!	Spaces preview
	Storybook	ready!	Storybook preview
🦄	Changes	detected!	Details

---

Install Gradio from this PR

pip install https://gradio-pypi-previews.s3.amazonaws.com/ae7ff0f2b69d8df10e04499b6ce20c75cde34f61/gradio-5.20.1-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@ae7ff0f2b69d8df10e04499b6ce20c75cde34f61#subdirectory=client/python"

Install Gradio JS Client from this PR

npm install https://gradio-npm-previews.s3.amazonaws.com/ae7ff0f2b69d8df10e04499b6ce20c75cde34f61/gradio-client-1.13.1.tgz

Use Lite from this PR

<script type="module" src="https://gradio-lite-previews.s3.amazonaws.com/ae7ff0f2b69d8df10e04499b6ce20c75cde34f61/dist/lite.js""></script>

[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
@gradio/chatbot	patch
gradio	patch

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With the following changelog entry.

Fixed size for pending thoughts

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[abidlabs]

I like the UI! Although I'm not sure if this works with nested thoughts: if you run demo/chatinterface_nested_thoughts/run.py there's no way to see the nested thoughts even after the thoughts have completed running:

[dawoodkhan82]

@abidlabs fixed

[abidlabs]

I think this looks good, but perhaps it'd be good to get a second opinion from @yvrjsharma or @aymeric-roucher