Increase brightness of click /focus highlight across components

[KrooshalUX]

Current theme examples:

Next theme:

[joshuarrrr]

@KrooshalUX Do you mind adding screenshots when you get a chance here? I think I remember the issue, but I want to make sure we fix the right thing.

[KrooshalUX]

@joshuarrrr updated with examples from discover. SEeing them side-by-side, this may be OK. The dark mode on both current and next are equally dull and blend in with their respective backgrounds, so we may want to address the overall way this is implemented?

[BSFishy]

Should be done with #948