pauseAction.ts submitted a real <form> POST, so clicking pause/resume
navigated the whole page to hive-c0re's plain-text "ok" response body
instead of staying on the agent terminal. Switch to a fetch with
mode: 'no-cors' (still cross-origin-safe, no CORS headers needed from
hive-c0re) + credentials: 'include' to match the form's cookie
behavior, then refresh() the agent state afterward, matching the
existing postModel/postEffort pattern right next to it in Root.tsx.