Prompt selector highlights a fixed prompt instead of the current prompt

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

_No response_

What subscription do you have?

_No response_

What platform is your computer?

macOS

What issue are you seeing?

The prompt selector highlights the wrong prompt. Instead of tracking the prompt that is currently selected or visible, the highlight remains on one fixed prompt.

This makes the selector misleading because its highlighted marker does not represent the current position in the task.

What steps can reproduce the bug?

1. Open a task containing multiple prompts.
2. Use the prompt selector or move through the task.
3. Observe the highlighted prompt marker.
4. Move to a different prompt.

The same fixed prompt remains highlighted instead of the current prompt.

What is the expected behavior?

The highlighted marker should update to indicate the current prompt.

Additional information

A screenshot is available and will be added separately.