feat: carry suggested third-party profile through pending oauth

backend/internal/handler/auth_oauth_pending_flow_test.go

@@ -0,0 +1,40 @@
+package handler
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestApplySuggestedProfileToCompletionResponse(t *testing.T) {
+	payload := map[string]any{
+		"access_token": "token",
+	}
+	upstream := map[string]any{
+		"suggested_display_name": "Alice",
+		"suggested_avatar_url":   "https://cdn.example/avatar.png",
+	}
+
+	applySuggestedProfileToCompletionResponse(payload, upstream)
+
+	require.Equal(t, "Alice", payload["suggested_display_name"])
+	require.Equal(t, "https://cdn.example/avatar.png", payload["suggested_avatar_url"])
+	require.Equal(t, true, payload["adoption_required"])
+}
+
+func TestApplySuggestedProfileToCompletionResponseKeepsExistingPayloadValues(t *testing.T) {
+	payload := map[string]any{
+		"suggested_display_name": "Existing",
+		"adoption_required":      false,
+	}
+	upstream := map[string]any{
+		"suggested_display_name": "Alice",
+		"suggested_avatar_url":   "https://cdn.example/avatar.png",
+	}
+
+	applySuggestedProfileToCompletionResponse(payload, upstream)
+
+	require.Equal(t, "Existing", payload["suggested_display_name"])
+	require.Equal(t, "https://cdn.example/avatar.png", payload["suggested_avatar_url"])
+	require.Equal(t, true, payload["adoption_required"])
+}