Issue #2 - [FEATURE] Add copy button for code blocks

[zenocross]

Description

Code blocks in chat messages lack a convenient way to copy their content. Users must manually select and copy code.

Current Behavior

• Code blocks display syntax-highlighted code
• No copy functionality available
• Users must manually select text to copy

Expected Behavior

• Copy button appears when hovering over code blocks
• One-click copying of entire code block content
• Visual feedback on successful copy

Use Cases

• Quick code snippet copying
• Improved developer experience
• Reduces manual selection errors

Proposed Solution

Add a copy button overlay that:

• Appears on hover over code blocks
• Copies code content to clipboard on click
• Shows "Copied!" feedback briefly

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