feat(MED-100): show cart line item quantities total instead of items total count

supabase/migrations/20250828133240_show_medipost_dispatch_error_for_order_in_medusa.sql

@@ -3,6 +3,7 @@ RETURNS boolean AS $$
 SELECT EXISTS (
     SELECT 1 FROM medreport.medipost_actions
     WHERE medusa_order_id = $1
+    AND action = 'send_order_to_medipost'
     AND has_error = true
 );
 $$ LANGUAGE sql STABLE;