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Five productivity features: search/replace across the whole workspace (with a safety commit before Replace all), a Synopsis window compiling every chapter's slug, a Diff button per Auto-Snapshot to compare against an older snapshot instead of only HEAD, typewriter-style cursor centering and paragraph dimming gated on Distraction-free mode, and a per-day word-count streak persisted to word_log.json alongside order.json/titles.json. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>