Update same-day booking to SMS client welcome status

Your assigned bookings lose pre-trip readiness when same-day flags aren't tracked and messages get missed. Get bookings flagged and updated so coordinators act one hour before departure.

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Overview

Same-day booking flags often slip through, forcing coordinators into last-minute outreach and missed payments. This flow computes reminder times, waits until the pre-trip window, and marks the booking for client welcome so staff act one hour before departure.