The backend returns naive UTC datetime strings (no Z suffix). dayjs was treating
them as local time, so staff in ET saw UTC times. Added treat_as_utc param to
iso_datetime_formatter (default false, zero breakage to existing call sites) that
appends Z before parsing so dayjs converts to browser-local time on display.
Applied to all print timestamp call sites in badge list (first/last print visible
row + debug row) and to created_on/updated_on in the debug row.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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