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Code view uses a lake with imperative DOM spans. Each token has its base syntax colour class stored. On each step, update-code-highlight iterates all spans and sets class based on step-idx: evaluated tokens go bold, current step gets violet bg, future stays normal. No reactive re-rendering of the code view — direct DOM class updates. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>