Copy both error message and content on mermaid error

[mrubens]

Important

Enhance CopyButton in MermaidBlock.tsx to copy both error message and Mermaid code on error.

• Behavior:
  • In MermaidBlock.tsx, the CopyButton now copies both the error message and the Mermaid code when an error occurs.
  • Combines error message and code into a single string formatted with "Error: {error}\n\nmermaid\n{code}\n".

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Latest commit: e83bc34

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