[Request] Auto-refresh editor when files change on disk (with conflict prompt for unsaved local edits)

[leolelego]

Use case / Example:

1. Open a project on an SSH/SFTP-mounted filesystem.
2. Edit a file externally — for example via a terminal session, or an AI coding agent like Claude Code / Claude Remote making changes directly on disk.
3. Switch back to Code App: the editor still shows the old, stale content. Changes made outside the app aren’t picked up automatically.

Proposed behavior:

• When a file is modified on disk (detected via filesystem watcher / SFTP polling), the open editor tab should automatically refresh to reflect the new content — as long as there are no unsaved local changes.
• If the local buffer has unsaved changes that conflict with the on-disk version, prompt the user with options such as:
  • Keep local changes (overwrite disk)
  • Load disk version (discard local changes)
  • View diff / merge manually

Why this matters:

This is increasingly common with AI coding assistants and remote dev workflows that edit files directly on disk outside the editor’s control. Without auto-refresh, users risk working on stale files or unknowingly overwriting external changes when they save.