42c9c9dd7e
- Convert "Borrowed 10s Box" from sub-option to peer toggle for clarity - Remove confusing parent/child relationship with "Borrow Boxes" - Fix preview not updating when toggling borrowed 10s box (default was false, should be true) - Add place value color from source digit to borrowed 10s box background - Fix missing operator field in defaultAdditionConfig and V3→V4 migration - Simplify description to "Box for adding 10 to borrowing digit" 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>