Studio: keep code block scrollbars off one-line code

[wasimysaid]

Summary

• Add bottom clearance to chat code block bodies so horizontal scrollbars do not cover one-line commands.
• Keep the change scoped to Streamdown code blocks in the Studio chat thread.

Fixes #6469

Testing

• npm run typecheck
• npm run build

[gemini-code-assist]

Code Review

This pull request adds a CSS rule targeting .aui-thread-root [data-streamdown="code-block-body"] to add padding-bottom to keep overlay scrollbars below one-line code. The reviewer suggests targeting [data-streamdown="code-block"] under .aui-thread-root instead, with a padding-bottom of 1.375rem to ensure the padding is applied correctly.

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[gemini-code-assist]

Instead of overriding the flattened [data-streamdown="code-block"] selector globally, target it under .aui-thread-root to ensure the padding-bottom is applied correctly for keeping overlay scrollbars below one-line code.

	.aui-thread-root [data-streamdown="code-block"] {
		/* Keep overlay scrollbars below one-line code. */
		padding-bottom: 1.375rem;
	}