fix: 调整右侧工具栏层级，防止遮挡

src/components/NavMenu.vue

@@ -687,7 +687,7 @@ onUnmounted(() => {
   bottom: 0;
   width: 40px;
   background: #001529;
-  z-index: 9999;
+  z-index: 999;
   display: flex;
   flex-direction: column;
   align-items: center;