Minor style fixes

submitting some minor style fixes to align the extension with the design specs, i've also created a v.0.0.7 page on figma.

there are a few things that i did not manage to resolve, hence marking this PR as draft.

1. selected text

i would like to set the selected text background color to white before verification

and to background-color-subtle + color-subtle during verification or result (with no inference)

2. current step containter

when working in storybook the stroke of the grey spinner is the same as the blue spinner

but when that's not the case when i run the build

3. with no answer result

i did not manage to properly style the no answer result

but i started to work on it in figma (i've been using the same nomenclature as storybook for simplicity)