Add support for Positron editor in "Open in" menu

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

Version 26.217.1959 (669)

What subscription do you have?

ChatGPT Pro

What platform is your computer?

macOS Tahoe 25.3

What issue are you seeing?

System details:

Positron and OS details:

Positron Version: 2026.03.0 build 96
Code - OSS Version: 1.108.0
Commit: 00e801e42841768c95c613988a46472afabca2e7
Date: 2026-02-17T07:45:12.095Z
Electron: 39.2.7
Chromium: 142.0.7444.235
Node.js: 22.21.1
V8: 14.2.231.21-electron.0
OS: Darwin arm64 25.2.0

Describe the issue:

Positron IDE is not recognized as like other VSCode forks in Codex app. See the attached picture

<img width="342" height="257" alt="Image" src="https://github.com/user-attachments/assets/5b6abf51-bedb-437f-be7d-1d1f65fd3b0f" />

What steps can reproduce the bug?

Download Codex, Positron IDE and install Codex extension

What is the expected behavior?

_No response_

Additional information

_No response_