[REQUEST] Add option to toggle KDE Application styles

[sapphired18]

Problem: some textbox didn't change the color to dark/white if I use kvantum, kvantum theme changing is not enough.

Toggling between kvantum and kvantum-dark would fix this issue.

[sapphired18]

update: it seems the problem caused by not closing the app first, it didn't refresh when the mode is changing

[MartinVonReichenberg]

Unfortunately,

There is nothing we could support you at Kvantum theming.
They are way too diverse by being able to identify if the themes as such are properly implemented into the KDE Plasma Desktop.