Add seat assignments to ticket records from spreadsheet

Unmapped spreadsheet rows leave attendee tickets without seat metadata, blocking box office verification. Add seat IDs to ticket records automatically so check-in is accurate on event day.

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Overview

When seat data lives in spreadsheets, it must reach ticket records reliably to avoid box office scrambling; this flow takes new row entries and patches ticket metadata automatically. The result is fewer seating errors and verified seats at check-in on event day.