The live ISO runs as root with XDG_RUNTIME_DIR=/run/user/0; arch-chroot
-u ryan switches the UID but doesn't reset the env, so tools running as
ryan tried to write to root's runtime dir (dconf failed to commit,
omarchy-theme-set's flock target hit Permission denied). Drop the var
so tools fall back to no-runtime-dir behaviour, which works inside the
chroot.
Ryan Hughes
0c63044066