Separate light mode and dark mode colors for roles

(#1363) Feature Under consideration accessibility community

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Comment by @mi2ebi
RexSystem 1 vote originally by @mi2ebi on GitHub
good idea !
For people using custom CSS, there could be a toggle letting them choose if they want their theme paired with “dark mode roles” or “light mode roles”.
this could maybe be done automatically by finding e.g. the OKLCH lightness of the background