Add disabled state for switch components

Currently a visual disabled state is missing. An example: If protect all apps in the App routing screen was enabled, all subsequent settings are disabled. That's not visually indicated though.

see @donuts comment from figma:

That's a good question. I noticed M3 uses state layers for this, but I didn't bother with them when designing these components. For the purposes of the pre-alpha I think a general rule of 40% opacity will be fine – and we can refine this later if needed.