fix: 修复 CustomNav 组件的导航内容高度设置，调整为 44px 以改善布局

src/components/CustomNav.vue

@@ -76,7 +76,7 @@ const handleLeft = () => {
 .nav-content {
   display: flex;
   align-items: center;
-  height: 52px; /* increased to give more vertical space */
+  height: 44px; /* increased to give more vertical space */
   padding: 0 15px;
 }