[Feature] Support markdown code block syntax highlight

What feature would you like to see?

codex:

<img width="565" height="301" alt="Image" src="https://github.com/user-attachments/assets/ebcb4604-24f9-4463-aae7-2a41eba04965" />

claude code:

<img width="552" height="172" alt="Image" src="https://github.com/user-attachments/assets/78401159-516f-4f0b-a3fc-c22247eceaa2" />

Are you interested in implementing this feature?

_No response_

Additional information

codex-cli 0.36.0