Add borrowing checkbox for subtraction problems#2

ezuk wants to merge 1 commit intolewdev:masterlewdev/hw-gen:masterfrom

ezuk:claude/add-borrowing-checkbox-011CUzWZyo2nKJZnagLAZmZPezuk/hw-gen:claude/add-borrowing-checkbox-011CUzWZyo2nKJZnagLAZmZPCopy head branch name to clipboard