Codex desktop app: add dark mode / follow system appearance

What variant of Codex are you using?

App

What feature would you like to see?

Title: Codex desktop app: add dark mode / follow system appearance

Request

Please add dark mode support to the Codex desktop app, ideally with an Appearance setting for:

• System
• Light
• Dark

Why

Most of my development environment is dark themed. When I switch from my editor, terminal, browser, or other dev tools into Codex, the bright app surface is jarring and uncomfortable during longer work sessions.

It would be especially helpful for late-night use and for users with light sensitivity.

Expected behavior

Codex should either follow the operating system appearance automatically or allow the user to choose dark mode manually.

Current behavior

I do not see a dark mode/theme option in Codex desktop app settings.

Additional information

_No response_