Add Devin Desktop (formerly Windsurf) to Open in editor #19763

Windsurf was renamed to Devin Desktop, and the Open picker doesn't list it. People who use it as their editor have to open projects by hand. I'd like approval to add it the same way the other VS Code forks are supported. The implementation is in #16066, which was closed because outside contributions are currently limited to bug fixes.

Proposed scope

• One devin entry in EDITORS (packages/contracts/src/editor.ts) with the label "Devin" and two commands. devin-desktop is the current CLI, windsurf covers installs from before the rename. It launches with --goto like the other VS Code forks.
• The Devin icon and a picker option in apps/web.
• No installNames entry. The app is Devin.app on macOS and installs to Programs\Devin on Windows, and both match the label.
• No remoteScheme. Devin registers devin:// and windsurf://, but I haven't confirmed that it handles VS Code's vscode-remote/ssh-remote+ links, so SSH environments won't offer Devin for now.

Effect on defaults

A saved editor choice always wins. Without one, T3 Code picks the first installed entry in EDITORS. Devin goes second to last, just before the file manager. So it only becomes the default for people who have Devin and no other supported editor, and today those people get the file manager. apps/web/src/editorPreferences.test.ts in the PR covers both cases. If you'd prefer a different position, I'll change it.

Background

• In Missing "Open" options #286, @juliusmarminge asked for editor additions to come as PRs (comment).
• Add Windsurf Editor Support #2654 added Windsurf. Its author closed it after the rename.

Could a maintainer approve adding Devin with this scope? If it's approved, I'll link the approval in #16066.