Update from code changes: document code block copy button CSS classes

[mintlify]

Summary

Documents two new CSS class hooks on code blocks — code-block-copy-button and code-block-fade-overlay — so users can target and style (or hide) the copy button and fade overlay from custom CSS.

Changes

• Added both classes to the "Content components" list in the CSS selectors reference on customize/custom-scripts.mdx.
• Included the display: none; example for hiding the copy button.
• Mirrored the same additions in the Spanish, French, and Chinese versions of the page.

Triggered by mintlify/mint#10204.

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Note

Low Risk
Documentation-only updates to the CSS selector reference; no runtime or product code changes.

Overview
Documents two new element selector hooks for code blocks in the custom scripts CSS reference (customize/custom-scripts.mdx and localized copies).

Adds code-block-copy-button and code-block-fade-overlay under the “Content components” accordion, next to the existing code-block / code-block-icon entries. The copy-button line includes a concrete hide example: .code-block-copy-button { display: none; }.

Same additions are mirrored in the Spanish, French, and Chinese custom-scripts pages.

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