Add custom code block renderer with language display and copy functionality. Links now open in new windows, and clicking image links no longer triggers both link navigation and image preview.
- Add CodeBlock component with copy-to-clipboard button and language label
- Configure all markdown links to open in new windows with target="_blank"
- Fix image link behavior to prevent duplicate actions when clicked
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Co-Authored-By: Claude <noreply@anthropic.com>
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