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- Add flatTagIndexMap for O(1) tag lookups (replaces O(n²) findIndex calls) - Memoize caret position calculation to avoid DOM manipulation on every render - Use refs for inputValue/cursorPosition to keep handleTagSelect callback stable - Change itemRefs from index-based to tag-based keys to prevent stale refs - Fix scroll jump in nested folders by removing scroll reset from registerFolder - Add onFolderEnter callback for scroll reset when entering folder via keyboard - Disable keyboard navigation wrap-around at boundaries - Simplify selection reset to single effect on flatTagList.length change Also: - Add safeCompare utility for timing-safe string comparison - Refactor webhook signature validation to use safeCompare Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>