Fixes
QT_QPA_PLATFORMalways forced tooffscreenfor CLI: Previously set withsetdefault, so aQT_QPA_PLATFORMalready in the environment (e.g.xcb) would be respected. CLI never opens windows and must not negotiate a display platform — the variable is now unconditionally set tooffscreen. Users no longer need to set it manually before runningtrcc theme-loador any other CLI command