When agents send replies from the native Facebook Messenger app (not
Chatwoot), echo events were created without external_echo metadata and
could be misrepresented in the UI. This change updates Messenger echo
message creation to:
- set content_attributes.external_echo = true for outgoing_echo messages
- set echo message status to delivered
- keep sender as nil for echo messages (existing behavior)
<img width="2614" height="1264" alt="CleanShot 2026-02-26 at 16 32
04@2x"
src="https://github.com/user-attachments/assets/ba61c941-465d-4893-814e-855e6b6c79e8"
/>
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