Extract closeDescendants() helper that: - Recursively closes all descendants (not just direct children) - Logs errors instead of silent failure - Uses distinct variable names (no shadowing) - Is reused by both burn and squash This handles nested molecules from the Christmas Ornament pattern. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>