Use KSandbox instead of host-spawn
KCoreAddons 5.97+ includes a KSandbox API that wraps flatpak-spawn, which Konsole now uses when built as a flatpak:
https://invent.kde.org/utilities/konsole/-/blob/master/src/session/Session.cpp
Could qmlkonsole be ported to use this instead of requiring host-spawn
?