add core themes

[hannahblair]

Description

🔗 Neon preview

Closes: #(issue)

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[gradio-pr-bot]

🪼 branch checks and previews

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

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Install Gradio from this PR

pip install https://gradio-pypi-previews.s3.amazonaws.com/2e2116213c63e8770da9ccfeb2cb3b0e2fe928a3/gradio-6.9.0-py3-none-any.whl

Install Gradio Python Client from this PR

pip install "gradio-client @ git+https://github.com/gradio-app/gradio@2e2116213c63e8770da9ccfeb2cb3b0e2fe928a3#subdirectory=client/python"

Install Gradio JS Client from this PR

npm install https://gradio-npm-previews.s3.amazonaws.com/2e2116213c63e8770da9ccfeb2cb3b0e2fe928a3/gradio-client-2.1.0.tgz

[gradio-pr-bot]

🦄 change detected

This Pull Request includes changes to the following packages.

Package	Version
@gradio/audio	minor
@gradio/checkboxgroup	minor
@gradio/radio	minor
gradio	minor

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• add core themes

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