CSS discrepancies

[mimarz]

Issue where we scribble down notes and things we discovered during #1846 we should look into.

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1. Maybe avoid classes for readonly and disabled and rely on native selectors instead.
2. We should probably add css classes to our components for users to be able to target elements
3. tooltip: Has no styling for content arrow. This is provided from floating-ui
4. chip: clean up css variables
5. Try to use aria-attributes (that needs to be set) to style as much as possible

[eirikbacker]

Will be solved by #2295