refactor(webui): drop redundant logout button next to settings

The 'Exit WebUI' action is already available inside the settings dialog —
having a second one in the sidebar footer is duplicate UI.

Author: linyuchen

src/webui/FE/App.tsx

@@ -281,10 +281,6 @@ function App() {
         collapsed={sidebarCollapsed}
         onToggleCollapse={() => setSidebarCollapsed(!sidebarCollapsed)}
         onOpenSettings={() => setShowSettingsDialog(true)}
-        onLogout={() => {
-          deleteCookie('webui_token')
-          window.location.reload()
-        }}
       />
 
       <main className={`flex-1 overflow-auto z-10 transition-all duration-300 ${sidebarCollapsed ? '' : 'md:ml-64'}`}>

src/webui/FE/components/layout/Sidebar.tsx

@@ -12,7 +12,6 @@ import {
   ChevronLeft,
   ChevronRight,
   Settings,
-  LogOut,
 } from 'lucide-react'
 
 interface SidebarProps {
@@ -27,19 +26,17 @@ interface SidebarProps {
   collapsed?: boolean;
   onToggleCollapse?: () => void;
   onOpenSettings?: () => void;
-  onLogout?: () => void;
 }
 
-const Sidebar: React.FC<SidebarProps> = ({ 
-  activeTab, 
-  onTabChange, 
-  accountInfo, 
-  isOpen = true, 
+const Sidebar: React.FC<SidebarProps> = ({
+  activeTab,
+  onTabChange,
+  accountInfo,
+  isOpen = true,
   onClose,
   collapsed = false,
   onToggleCollapse,
   onOpenSettings,
-  onLogout,
 }) => {
   const menuItems = [
     { id: 'dashboard', icon: LayoutDashboard, label: 'Dashboard' },
@@ -168,13 +165,6 @@ const Sidebar: React.FC<SidebarProps> = ({
             >
               <Settings size={18} />
             </button>
-            <button
-              onClick={onLogout}
-              className="p-2 rounded-lg transition-all duration-200 text-theme-muted hover:bg-red-100 hover:text-red-500 dark:hover:bg-red-900/30"
-              title="退出 WebUI（不会退出QQ）"
-            >
-              <LogOut size={18} />
-            </button>
           </div>
         </div>
       </div>