Add current project file tree with quick previews

What variant of Codex are you using?

App

What feature would you like to see?

Opening the project in VSCode seems overkill when I only want to see one file, and terminal doesn't feel right to do that, although that's what I've been using

Idea is to add a File tree with quick previews of files, no editing, just preview. Perhaps in diff viewer there could also be a tab for project files to streamline UI and use the same file tree. You'd effectively have "unstaged", "staged", "current", where current will show the file where the diff preview would be

Additional information

_No response_