codeBuilder property

Custom widget builder for rendering code blocks.

This builder is called for each fenced code block in the markdown, receiving:

• code: The code content as a string
• language: The language identifier (e.g., 'dart', 'javascript'), or null if not specified

If not provided, code blocks are rendered using the default builder which includes syntax highlighting via flutter_highlight.

Example:

codeBuilder: (code, language) {
  return Container(
    padding: EdgeInsets.all(16),
    decoration: BoxDecoration(
      color: Colors.black87,
      borderRadius: BorderRadius.circular(8),
    ),
    child: SelectableText(
      code,
      style: TextStyle(
        fontFamily: 'Courier New',
        color: Colors.white,
      ),
    ),
  );
}