Refactor code structure for improved readability and maintainability

ccw/frontend/src/components/layout/AppShell.tsx

@@ -162,7 +162,6 @@ export function AppShell({
     <div className="flex flex-col min-h-screen bg-background">
       {/* Header - fixed at top */}
       <Header
-        onMenuClick={handleMenuClick}
         onRefresh={onRefresh}
         isRefreshing={isRefreshing}
         onCliMonitorClick={handleCliMonitorClick}

ccw/frontend/src/components/layout/Sidebar.tsx

@@ -22,7 +22,6 @@ import {
   Zap,
   GitFork,
   Shield,
-  History,
   Server,
   Layers,
   Wrench,
@@ -89,7 +88,6 @@ const navGroupDefinitions: NavGroupDef[] = [
     icon: Brain,
     items: [
       { path: '/memory', labelKey: 'navigation.main.memory', icon: Brain },
-      { path: '/prompts', labelKey: 'navigation.main.prompts', icon: History },
       { path: '/skills', labelKey: 'navigation.main.skills', icon: Sparkles },
       { path: '/commands', labelKey: 'navigation.main.commands', icon: Terminal },
       { path: '/settings/rules', labelKey: 'navigation.main.rules', icon: Shield },