docs: mention copy button and fade overlay CSS hooks on Format code page

[mintlify]

Documentation changes

Adds pointers on /create/code to the new code-block-copy-button and code-block-fade-overlay element selectors so readers configuring code blocks can find the CSS hooks (already documented in the selector reference by #7003).

• In "Code blocks", note that the copy button can be styled or hidden via code-block-copy-button, with the display: none; example.
• In "Expandable", note the collapsed-state fade overlay can be styled via code-block-fade-overlay.

Both link to the element selectors section of customize/custom-scripts.

Closes

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Generated by Mintlify Agent.

Requested by: ethan@mintlify.com via Slack
Mintlify session: slack_1786996877.907599_C04V261AH2T

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Note

Low Risk
Documentation-only cross-links on the Format code page; no product or runtime behavior changes.

Overview
Updates create/code.mdx so readers configuring code blocks see the same CSS hooks that customize/custom-scripts already lists.

Under Code blocks, it adds a note that the copy button can be styled or hidden via the code-block-copy-button element selector, with a display: none example and a link to the element selectors section.

Under Expandable, it extends the existing expandable description to mention the collapsed-state fade overlay and how to style it with code-block-fade-overlay, again linking to element selectors.

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