Send updated shift request alerts to team channel

You lose context when shift request rows change in your roster sheet, leaving coordinators scrambling for coverage. This sends context-rich alerts so coverage is confirmed before the next shift.

Overview

Shift changes recorded in a spreadsheet often arrive without context, forcing coordinators into last-minute scramble and risking coverage gaps. This flow turns those updates into threaded channel alerts with row links and summaries so coverage is confirmed within minutes and before the next shift.