AdminOrderTimelineEntry had no actor field at all - order status
changes and refund requests were unattributed. Added actor: string,
populated from the signed-in admin's displayName (same pattern as
Users/Transactions), surfaced in the order detail timeline UI.
Real backend-issued orders still need a server-side audit trail;
this only covers the local mock gateway pending backend work
(BACKEND-API-REFERENCE.md §12).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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