Dark mode now works inside Vision, and I'm looking for Vision developers to test it.
In the previous version the module switched itself off as soon as you opened a Vision window, because a window saved from a dark Designer picked up classes a Vision client cannot load. Since the latest version that is fixed at the serialiser. Please use version 0.4.1. If you have bugs post it here or create a github issue.
One known limitation: the Vision canvas renders in dark colours in the Designer wherever components use the look-and-feel defaults; the client is always light. Nothing is written into the window by that.