fix

frontend/src/app/useWorkspaceSurface.tsx

@@ -1,4 +1,4 @@
-import { useCallback, useEffect, useMemo } from 'react';
+import { useCallback, useEffect, useMemo, useRef } from 'react';
 import type { ComponentProps, ReactNode } from 'react';
 import { SidebarExpandIcon } from '../components/icons';
 import DocumentsPanel from '../documents/panel/DocumentsPanel';
@@ -70,11 +70,23 @@ export const useWorkspaceSurface = ({
     return () => registerDetailCloseHandler(null);
   }, [registerDetailCloseHandler, detailPanelProps?.onClose]);
 
+  const setDetailActiveRef = useRef(setDetailActive);
+  useEffect(() => {
+    setDetailActiveRef.current = setDetailActive;
+  }, [setDetailActive]);
+
   useEffect(() => {
     setDetailActive(Boolean(detailPanelOpen));
-    return () => setDetailActive(false);
   }, [detailPanelOpen, setDetailActive]);
 
+  useEffect(() => {
+    return () => {
+      if (setDetailActiveRef.current) {
+        setDetailActiveRef.current(false);
+      }
+    };
+  }, []);
+
   const renderSidebarToggle = useCallback<() => ReactNode>(() => {
     if (!sidebarHidden) {
       return null;