Archive completed travel rows to assignments table now

You have travel rows lingering in active sheets, causing reconciliation delays. Archive those rows into a central completed-travel table so coordinators can reconcile the same day.

Overview

When completed travel entries sit in active sheets, coordinators waste time reconciling and billing is delayed. This flow consolidates finished trips into a single archive table and clears the original row, giving program leads one reliable place to reconcile and bill the same day.