Ship `mc.ext.ini` as the `local.mc.extIni` option (like `local.mc.menu`):
Enter browses archives in-place as before and delegates every other type to
`xdg-open`. Add public `mime.nix` with `xdg.mimeApps` defaults (pdf ->
zathura, images -> imv, audio/video -> mpv, office -> libreoffice) -- public
because those handlers are; personal browser/mail defaults stay private.
Also document, at the Hyprland swallow config, how swallowing differs from an
app opening fullscreen/maximized (LibreOffice restores its own maximized state
and looks swallowed but isn't).
