fix: use empty string as initial managerNameState default

frontend/packages/dashboard/src/tabs.js

@@ -171,7 +171,7 @@ window.marked = marked;
 
   // Logical name of the manager agent. Populated from `s.manager_name`
   // on snapshot load so chip lists don't hardcode the manager name.
-  let managerNameState = 'ruth';
+  let managerNameState = '';
   function syncManagerNameFromSnapshot(s) {
     if (s.manager_name) managerNameState = s.manager_name;
   }