Update EIP-7851 Enhances Post-Quantum Security and Flexibility

EIP-4788 updates deactivation to irreversible, enhancing post-quantum security by removing ECDSA key reactivation. It introduces a 7-day delay allowing cancellation before finalization. The design shifts from a precompile to a system contract, enabling per-account `finalizationTimestamp` storage. This consolidates deactivation, cancellation, and status queries, simplifying implementation consistent with EIP-2935 and EIP-7002 standards.