The Source of truth panel previously only showed the email subject and
body inside a collapsed-by-default toggle. Operators couldn't see who
sent the mail or what the subject was without expanding the body.
This change adds a persistent header above the collapsible body with
two always-visible lines:
From: jane@acme.test (AtSign icon)
Subject: RFQ for 10x bolts (Mail icon)
Sender resolution chain (in getOrderReviewData):
1. order.email_sender — n8n ingest snapshot of the actual From:
on the inbound RFQ (best signal)
2. quote.email_sender — covers pre-snapshot legacy orders
3. customer.email — last-resort fallback
4. '' — renders as '(unknown sender)' placeholder
Subject already lived on the same record; the header just promotes it
out of the collapsed body so it's visible without expanding. The
existing '(no subject)' / '(no body)' placeholder pattern is matched
with a new '(unknown sender)' placeholder.
Tests: 7 new (3 modal header, 4 service sender fallback chain). 101
passing total.
Co-authored-by: Orca <help@stably.ai>
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