Codex app: add a draggable workspace file tree/sidebar

Feedback

In the Codex desktop app, I often need to drag and drop copies of files from the current workspace into other apps, such as ChatGPT. A text-only file tree in the chat is not enough for this workflow because the files themselves are not draggable.

Current behavior

When I am working in a Codex thread, I may not have a clear, persistent view of where the current project files are stored. The practical workaround is to ask Codex to open Finder for the workspace folder, then drag files from Finder into the target app. That costs a turn and breaks flow.

Desired behavior

Add a persistent workspace file tree/sidebar in the Codex app, similar to VS Code's file explorer, where files and folders are real draggable items. Ideally, users could drag files directly from Codex into other apps, or reveal/open the containing folder from the same sidebar.

Why this matters

This is a frequent workflow when moving files between Codex, ChatGPT, editors, and other tools. VS Code's sidebar makes this easy; Codex would be easier to use as a primary coding surface if the workspace files were visible and draggable without asking the agent to launch Finder.