chengyongru 8eddacf2f8 fix(webui): sync code block theme with dark mode toggle instantly
- Replace one-time DOM read with MutationObserver on <html> class
- Remove hardcoded #0a0a0a background, let oneDark/oneLight own it
- Add light-mode header/copy-button colors (bg-zinc-100 for light)
- Bump font size from 13px to 14px, line-height from 1.55 to 1.6
- Add subtle border to distinguish code block edges
2026-04-20 00:21:07 +08:00
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