fix(agent-office): useAgentManager reconnect via ref to satisfy lint

Previously connect's onclose handler referenced connect itself before
the useCallback declaration, triggering react-hooks/immutability. Hold
the latest connect in a ref (updated in useEffect) and call through it
on reconnect. Same runtime behavior, lint-clean.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/pages/agent-office/hooks/useAgentManager.js

@@ -12,6 +12,7 @@ export function useAgentManager() {
 
   const wsRef = useRef(null);
   const reconnectRef = useRef(null);
+  const connectRef = useRef(null);
 
   const connect = useCallback(() => {
     const protocol = window.location.protocol === 'https:' ? 'wss' : 'ws';
@@ -68,12 +69,16 @@ export function useAgentManager() {
 
     ws.onclose = () => {
       setConnected(false);
-      reconnectRef.current = setTimeout(connect, WS_RECONNECT_DELAY);
+      reconnectRef.current = setTimeout(() => connectRef.current?.(), WS_RECONNECT_DELAY);
     };
 
     ws.onerror = () => ws.close();
   }, []);
 
+  useEffect(() => {
+    connectRef.current = connect;
+  }, [connect]);
+
   useEffect(() => {
     connect();
     return () => {