Update contact last login timestamps from channel messages

You lack recent login context when channel notes aren't added to contact records, leaving reps to prep without activity cues. Record login time on the contact so reps see fresh activity before outreach.

Overview

When login notes sit in chat, reps often lack up-to-date activity context and outreach becomes less relevant. This flow captures those reports and writes last-login times to contact records so reps see fresh activity within minutes and can prioritize outreach accordingly.