There's flatpak, which is cross-distro, sandboxed, and is installed by default on most distros. It uses xdg-desktop-portals to request access to files through a desktop-provided file picker.

Sadly code editors aren't really suitable for flatpaks, since they usually require access to dependencies installed on the host. This can be worked around by using dev containers, vor the IDE has to ne developed with sandboxing in Kind (like GNOME Builder).