How to easily implement a Mac theme (with built-in traffic light and three-dot window buttons) on Ubuntu 26.04

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FYI, such environment variables should be set in environment.d drop-ins, otherwise they only have an effect in login shells:

mkdir -p ~/.config/environment.d/
cat >~/.config/environment.d/QT.conf <<EOF
QT_QPA_PLATFORM="xcb;wayland"
QT_QPA_PLATFORMTHEME=qt5ct
# QT_WAYLAND_DECORATION=whitesur-gtk
EOF

(log out and back in for changes to take effect)

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