- Fixed hasAnyChildren method to detect all descendant headers
- Level 1 headers now collapse all levels 2,3,4,5,6...
- Level 2 headers now collapse all levels 3,4,5,6...
- And so on for all header levels
- Updated toggleAllCollapsed to use the improved logic
- Enhanced user experience with proper hierarchical folding

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Co-Authored-By: Claude <noreply@anthropic.com>