Summary

• Port WCAG AA color contrast fixes from crit CLI (PR #301) to crit-web
• Update --crit-fg-muted, --crit-fg-dimmed, word-diff opacities, --crit-fg-on-accent, badge opacities across dark/light themes
• Replace GitHub Dark Dimmed hljs with Tokyo Night Dark syntax colors
• Update light theme: accent, green, red, yellow values + add missing hljs selectors
• Add missing hljs selectors to light theme (.hljs-params, .hljs-link, .hljs-property, .hljs-tag, .hljs-char.escape_, .hljs-punctuation)

Review

• Code review: passed (99.7% parity with crit)
• Parity audit: passed

Test plan

• mix precommit — 386 tests pass
• See also: fix: resolve WCAG AA color contrast violations crit#301 — source changes

Closes #90

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