Improve indication of on/off for buttons

[evolunis-ws]

I still don’t know if green means on or off. I am always checking against Shelly. They have these nice icons with a highlighted border. We could try to find something similar. Should be immediately clear. Also, I don’t like the red and green too much. Would be happy if all could be in the same colors, just blue and white - maybe with one additional color, but ideally just white/blue, including the auto button color. Ideally, it should be immediately clear whether auto is on on/off (currently, green indication of menu button), if not, we need to explain. This requires some tests with GUI features, no big brain. If you want, I can play with this - if will also help me to understand how to compile the app.