Sorry, I'm not getting this at all and I am struggling to explain what the problems are.

How many icons do we need?, one or two?, meaning a white icon for dark ambience and a black icon for light ambience?, or just one white icon named 'main-light.png' which will do the job for both light and dark ambience?, as usual, I am confused with your directions, sorry, not meaning to be awkward.

Also, where is main.qml? and what do I need to change in main.qml when I find it?, again, I cannot follow your directions, seems like you are talking about patches for WebCatalog and not the usual Patchmanager...?