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/hooks/usePageTitleWithConnection.ts

@@ -0,0 +1,15 @@
+import { useMemo } from "react";
+import { useDevice } from "@/contexts/DeviceContext";
+
+export function withDisconnectPageTitle(title: string): string {
+  return `${title}(Disconnect)`;
+}
+
+/** Append "(Disconnect)" to the page title when the device is not connected. */
+export function usePageTitleWithConnection(title: string): string {
+  const { isConnected, isConnecting } = useDevice();
+  return useMemo(() => {
+    if (isConnected || isConnecting) return title;
+    return withDisconnectPageTitle(title);
+  }, [title, isConnected, isConnecting]);
+}