修复导出json和markdown时中文及其他utf8字符乱码问题

app/global.d.ts

@@ -19,6 +19,7 @@ declare interface Window {
     };
     fs: {
       writeBinaryFile(path: string, data: Uint8Array): Promise<void>;
+      writeTextFile(path: string, data: string): Promise<void>;
     };
     notification:{
       requestPermission(): Promise<Permission>;