修复交易记录导航折叠功能缺失的JS函数

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

ft-app/app/templates/base.html

@@ -270,6 +270,10 @@ function setTheme(dark) {
 function toggleTheme() {
   setTheme(document.documentElement.getAttribute('data-theme') !== 'dark');
 }
+function toggleNavGroup(e, id) {
+  e.preventDefault();
+  document.getElementById(id).classList.toggle('open');
+}
 (function() {
   try {
     var s = localStorage.getItem('ft-theme');