Restore Copy Button in OpenAPI Documentation

[martyanovandrey]

Description
The copy button is missing in the OpenAPI documentation due to style issues. This needs fixing to ensure users can easily copy code snippets and endpoints.

Proposed Solution

• Update CSS styles to ensure the visibility and functionality of the copy button.
• Test for consistent display across different browsers and devices.

Acceptance Criteria

• Copy button is visible and operational in all OpenAPI documentation sections.
• Consider adding tests to prevent future issues.

Entry point for development

openapi-extension/src/runtime/components/Response.tsx

Line 65 in 26d5501

className={yfmSandbox('clipboard-button')}