xfy e68b77aac0 style(highlight): unify code block background via --color-paper-code-block
strip syntect-injected background-color from generated CSS so the code
block background comes from a single source (--color-paper-code-block
in input.css), avoiding double-layer color mismatch at the .code span
edge. update the variable values for both light and dark themes.
2026-06-23 15:28:12 +08:00
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