Codex App: support folders and subfolders to organize projects in the sidebar

What feature would you like to see?

Add support for organizing Codex App projects into folders and nested subfolders in the sidebar.

Examples:

• Clients/Project A
• Clients/Project B
• Personal/Experiments
• Work/Backend/API Gateway

This should be a UI-level organization feature for projects/workspaces, not just filesystem detection.

Why this matters

As the number of projects grows, the current flat project list becomes harder to manage.

Many users naturally group repositories by:

• client
• company/team
• area (frontend, backend, infra)
• type of work (experiments, production, docs)
• parent initiative/program

Without folders/subfolders, the sidebar becomes noisy and it takes longer to find the right project.

Proposed behavior

• Allow creating folders in the Codex App sidebar.
• Allow nesting subfolders.
• Allow moving existing projects into folders/subfolders.
• Allow collapsing/expanding folders.
• Preserve project/thread history when reorganizing items.
• Keep this independent from the local filesystem layout, so users can organize projects logically.
• Optionally allow sorting within each folder.

Related context

There is already a related feature request for project containers and shared project context:

• #13836

That request is about project-scoped chats/context/files. This request is narrower and focused on sidebar organization and navigation for many projects.

Are you interested in implementing this feature?

No, I'm requesting the capability as a product feature.