Add copy button functionality to CodeViewer component

[meet306]

The current code editor in the Llama Coder application does not include a "Copy Code" button, which makes it difficult for users to quickly copy the generated code. This feature would significantly improve usability.

Proposed Solution: Introduce a "Copy Code" button to the UI that allows users to copy the generated code using the navigator.clipboard API.

Steps to Reproduce:

Open the Llama Coder code editor. Generate some code using the editor. Observe that there’s no option to copy the generated code directly. Additional Context: This feature aligns with the roadmap item for improving best practices in the editor interface.

[vercel[bot]]

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[meet306]

fixed #77