code-block.scss carried two full highlight.js themes — a light set plus a
.dark override — left over from the ink era, with keywords in violet and
no relationship to the rest of the surface. CYBER has a single dark
theme, so keep one rule set and pull every token color from the existing
semantic variables: cyan for keywords, green for strings, amber for
literals, red for types. Keywords matching the accent keeps a code block
from competing with the chrome.
Diff line chrome also moves off the old slate values onto tokens, and the
code header now reads as part of the block instead of a light strip.
toor
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