Update deposit date from close date on deals

When expected close dates change, deposit scheduling for sauna orders can fall out of sync and delay installations. It sets a tentative deposit date and notifies ops so schedules align same day.

Overview

Close-date changes often ripple into deposit scheduling and installation prep, creating preventable delays for sauna deliveries. This flow standardizes a tentative deposit date and publishes a same-day Slack alert so sales and operations can act immediately and keep installations on schedule.