Pasted code is transformed into formatted rich text

Question

### What version of the Codex App are you using (From “About Codex” dialog)?

26.707.72221

### What subscription do you have?

Plus

### What platform is your computer?

Darwin 25.3.0 arm64 arm

### What issue are you seeing?

Trying to paste code like `__init__` formats it as **init** even if I paste it after a backtick.

### What steps can reproduce the bug?

Paste code like `__init__` and see it get formatted as bold.

### What is the expected behavior?

It doesn't get formatted.

### Additi