Update board date records from team time-off ranges

Your time-off ranges come as a single span, making daily availability unclear and delaying coverage planning. That creates per-day records so coordinators can reassign work before the next sprint.

Overview

When team members submit time-off as a single date span, daily availability is opaque and replanning stalls. This flow expands that span into per-day records and marks matching schedule rows so coordinators can reassign work within minutes, avoiding sprint delays.