Codex Desktop: make multi-task multi-window workflow first-class and discoverable

What variant of Codex are you using?

Codex App (Desktop, Windows)

What feature would you like to see?

Please make the multi-task, multi-window workflow a first-class and discoverable part of Codex Desktop.

Users should be able to open any task/thread in its own independent window and keep several task windows open at the same time. This is especially useful for long-running tasks, parallel work, and multi-monitor setups.

The command palette may already expose Open in new window, but this workflow is easy to miss. Suggested entry points and behavior:

• Add Open in new window to each task/thread's sidebar context menu.
• Allow dragging a task out of the main window to detach it.
• Keep the same task state synchronized if it is visible in more than one window.
• Preserve each window's position, size, and monitor across restarts.
• Make it easy to move several active tasks onto separate monitors.
• Clearly distinguish opening an existing task in a new window from creating a new task.

Why this matters

A typical workflow may include:

• one window running or monitoring a long task;
• another window reviewing code, logs, or results;
• additional task windows for independent projects;
• separate monitors dedicated to different tasks.

This avoids repeatedly switching the single main window and makes parallel Codex work much easier to supervise.

Related issues / non-duplicates

• #28448 concerns the compact floating/stay-on-top pop-out window on Windows.
• #29605 concerns explicit window targeting for codex:// deep links.

This request is specifically about making ordinary multi-task window management discoverable and first-class in the desktop UI.