当设备未连接时，各页面默认显示英文语言的文本，并在标题追加 (Disconnect)

client/src/components/Sidebar.tsx

@@ -5,10 +5,8 @@
 import { useDevice } from "@/contexts/DeviceContext";
 import { cn } from "@/lib/utils";
 import {
-  Activity,
   Bluetooth,
   ChevronRight,
-  Cpu,
   Gauge,
   Layers,
   LayoutDashboard,
@@ -30,8 +28,6 @@ const NAV_ITEMS: NavItem[] = [
   { path: "/eq", icon: Sliders, label: "Parametric EQ" },
   { path: "/effects", icon: Layers, label: "Effects" },
   { path: "/bluetooth", icon: Bluetooth, label: "Bluetooth" },
-  { path: "/dsp", icon: Cpu, label: "DSP & DAC" },
-  { path: "/display", icon: Activity, label: "Display & Lights" },
   { path: "/system", icon: Settings, label: "System" },
 ];