add code block improvements

Author: ethanpalm

changelog.mdx

@@ -41,6 +41,11 @@ noindex: true
   - Improved message retry functionality
   - Less verbose default responses for better user experience
 
+  ## Code block improvements
+
+  - Improved syntax highlighting
+  - Added more customization options including focus mode, expandable code blocks, dark and light mode responsiveness, language dropdown menu, line numbering, and icons
+
   ## Performance and reliability
 
   - Faster, more accurate search with debounced request cancellation