feat(captain): align streaming fallbacks

internal/handler/api/v1/copilot_thread_handler_test.go

@@ -237,6 +237,48 @@ func TestCopilotThreadMessagesListAndCreateUseNestedPayloads(t *testing.T) {
 	require.Len(t, messages, 4)
 }
 
+func TestCopilotMessagePayloadUsesThreadPushShape(t *testing.T) {
+	f := newCopilotParityFixture(t)
+	thread := f.createThread(t, "Need help")
+	threadID := uintString(uint(thread["id"].(float64)))
+	path := f.captainPath("/copilot_threads/" + threadID + "/copilot_messages/")
+
+	w := f.request(f.router, http.MethodGet, path, nil)
+	require.Equal(t, http.StatusOK, w.Code, w.Body.String())
+	messages := decodeMap(t, w)["payload"].([]any)
+	message := messages[0].(map[string]any)
+	nestedThread := message["copilot_thread"].(map[string]any)
+
+	require.Equal(t, thread["id"], nestedThread["id"])
+	require.NotNil(t, nestedThread["user"])
+	require.Equal(t, thread["account_id"], nestedThread["account_id"])
+	require.Nil(t, nestedThread["assistant"])
+	require.NotNil(t, message["account_id"])
+}
+
+func TestCopilotMessagePushPayloadMatchesChatwootEventData(t *testing.T) {
+	f := newCopilotParityFixture(t)
+	thread := f.createThread(t, "Need help")
+	threadID := uintString(uint(thread["id"].(float64)))
+	path := f.captainPath("/copilot_threads/" + threadID + "/copilot_messages/")
+	w := f.request(f.router, http.MethodPost, path, map[string]any{"message": "Follow up", "conversation_id": 123})
+	require.Equal(t, http.StatusOK, w.Code, w.Body.String())
+	created := decodeMap(t, w)
+
+	var stored model.CopilotMessage
+	require.NoError(t, f.db.Preload("CopilotThread.User").Preload("CopilotThread.Assistant").First(&stored, uint(created["id"].(float64))).Error)
+	push := copilotMessagePushPayload(&stored)
+	nestedThread := push["copilot_thread"].(gin.H)
+
+	require.Equal(t, created["id"], float64(push["id"].(uint)))
+	require.Equal(t, "user", string(push["message_type"].(model.CopilotMessageType)))
+	require.Equal(t, "Follow up", push["message"].(map[string]any)["content"])
+	require.Nil(t, push["account_id"])
+	require.Equal(t, stored.CopilotThreadID, nestedThread["id"])
+	require.Nil(t, nestedThread["assistant"])
+	require.NotNil(t, nestedThread["user"])
+}
+
 func TestCopilotThreadMessagesAreAccountAndUserScoped(t *testing.T) {
 	f := newCopilotParityFixture(t)
 	thread := f.createThread(t, "Private thread")