Equidistribution of primitive quartic torus packets for arbitrary orders

Let K range over totally real quartic fields with no proper intermediate field, and let $\mathcal{O}$ be any order in K. We prove that the packets of periodic diagonal orbits attached to invertible $\mathcal{O}$-ideal classes, weighted by orbit volume, equidistribute with no escape of mass as $|\mathrm{Disc}(\mathcal{O})|$ tends to infinity. The proof combines measure rigidity with a cubic-resolvent estimate that remains uniform at primes dividing the order index.