refactor(workspace): simplify sidebar state management using cookies

backend/packages/harness/deerflow/tools/skill_manage_tool.py

@@ -11,11 +11,7 @@ from weakref import WeakValueDictionary
 from langchain.tools import ToolRuntime, tool
 from langgraph.typing import ContextT
 
-<<<<<<< HEAD
-from deerflow.agents.lead_agent.prompt import clear_skills_system_prompt_cache
-=======
 from deerflow.agents.lead_agent.prompt import refresh_skills_system_prompt_cache_async
->>>>>>> main
 from deerflow.agents.thread_state import ThreadState
 from deerflow.mcp.tools import _make_sync_tool_wrapper
 from deerflow.skills.manager import (
@@ -119,11 +115,7 @@ async def _skill_manage_impl(
                 name,
                 _history_record(action="create", file_path="SKILL.md", prev_content=None, new_content=content, thread_id=thread_id, scanner=scan),
             )
-<<<<<<< HEAD
-            clear_skills_system_prompt_cache()
-=======
             await refresh_skills_system_prompt_cache_async()
->>>>>>> main
             return f"Created custom skill '{name}'."
 
         if action == "edit":
@@ -140,11 +132,7 @@ async def _skill_manage_impl(
                 name,
                 _history_record(action="edit", file_path="SKILL.md", prev_content=prev_content, new_content=content, thread_id=thread_id, scanner=scan),
             )
-<<<<<<< HEAD
-            clear_skills_system_prompt_cache()
-=======
             await refresh_skills_system_prompt_cache_async()
->>>>>>> main
             return f"Updated custom skill '{name}'."
 
         if action == "patch":
@@ -168,11 +156,7 @@ async def _skill_manage_impl(
                 name,
                 _history_record(action="patch", file_path="SKILL.md", prev_content=prev_content, new_content=new_content, thread_id=thread_id, scanner=scan),
             )
-<<<<<<< HEAD
-            clear_skills_system_prompt_cache()
-=======
             await refresh_skills_system_prompt_cache_async()
->>>>>>> main
             return f"Patched custom skill '{name}' ({replacement_count} replacement(s) applied, {occurrences} match(es) found)."
 
         if action == "delete":
@@ -185,11 +169,7 @@ async def _skill_manage_impl(
                 _history_record(action="delete", file_path="SKILL.md", prev_content=prev_content, new_content=None, thread_id=thread_id, scanner={"decision": "allow", "reason": "Deletion requested."}),
             )
             await _to_thread(shutil.rmtree, skill_dir)
-<<<<<<< HEAD
-            clear_skills_system_prompt_cache()
-=======
             await refresh_skills_system_prompt_cache_async()
->>>>>>> main
             return f"Deleted custom skill '{name}'."
 
         if action == "write_file":

frontend/src/app/workspace/workspace-content.tsx

@@ -1,45 +1,30 @@
-"use client";
-
-import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
-import { useCallback, useEffect, useLayoutEffect, useState } from "react";
+import { cookies } from "next/headers";
 import { Toaster } from "sonner";
 
+import { QueryClientProvider } from "@/components/query-client-provider";
 import { SidebarInset, SidebarProvider } from "@/components/ui/sidebar";
 import { CommandPalette } from "@/components/workspace/command-palette";
 import { WorkspaceSidebar } from "@/components/workspace/workspace-sidebar";
-import { getLocalSettings, useLocalSettings } from "@/core/settings";
 
-export function WorkspaceContent({
+function parseSidebarOpenCookie(
+  value: string | undefined,
+): boolean | undefined {
+  if (value === "true") return true;
+  if (value === "false") return false;
+  return undefined;
+}
+
+export async function WorkspaceContent({
   children,
 }: Readonly<{ children: React.ReactNode }>) {
-  const [queryClient] = useState(() => new QueryClient());
-  const [settings, setSettings] = useLocalSettings();
-  const [open, setOpen] = useState(false); // SSR default: open (matches server render)
-
-  useLayoutEffect(() => {
-    // Runs synchronously before first paint on the client — no visual flash
-    setOpen(!getLocalSettings().layout.sidebar_collapsed);
-  }, []);
-
-  useEffect(() => {
-    setOpen(!settings.layout.sidebar_collapsed);
-  }, [settings.layout.sidebar_collapsed]);
-
-  const handleOpenChange = useCallback(
-    (open: boolean) => {
-      setOpen(open);
-      setSettings("layout", { sidebar_collapsed: !open });
-    },
-    [setSettings],
+  const cookieStore = await cookies();
+  const initialSidebarOpen = parseSidebarOpenCookie(
+    cookieStore.get("sidebar_state")?.value,
   );
 
   return (
-    <QueryClientProvider client={queryClient}>
-      <SidebarProvider
-        className="h-screen"
-        open={open}
-        onOpenChange={handleOpenChange}
-      >
+    <QueryClientProvider>
+      <SidebarProvider className="h-screen" defaultOpen={initialSidebarOpen}>
         <WorkspaceSidebar />
         <SidebarInset className="min-w-0">{children}</SidebarInset>
       </SidebarProvider>