fix: 将侧栏提示层移到导航外侧

将桌面折叠侧栏的 NPopover 显式挂载到 body，并把提示框完整偏移到 64px 导航边界之外。

src/App.vue

@@ -127,7 +127,13 @@ function createMenuIcon(icon: typeof FolderOpen, label: string, popoverEnabled:
 
         return h(
             NPopover,
-            { trigger: 'hover', placement: 'right' },
+            {
+                trigger: 'hover',
+                placement: 'right',
+                to: 'body',
+                class: 'admin-nav-popover',
+                zIndex: 3000
+            },
             {
                 trigger,
                 default: () => label
@@ -239,7 +245,14 @@ const menuOptions = computed<MenuOption[]>(() => {
                 </NScrollbar>
                 <!-- 以下是侧栏底部后端连接：折叠裁切文字，图标位置保持不变 -->
                 <footer class="admin-sider-footer">
-                    <NPopover trigger="hover" placement="right" :disabled="narrow || !collapsed">
+                    <NPopover
+                        trigger="hover"
+                        placement="right"
+                        to="body"
+                        class="admin-nav-popover"
+                        :z-index="3000"
+                        :disabled="narrow || !collapsed"
+                    >
                         <template #trigger>
                             <NButton
                                 quaternary
@@ -368,6 +381,10 @@ const menuOptions = computed<MenuOption[]>(() => {
 .admin-menu-popover-trigger {
     @apply relative z-[1] inline-flex items-center justify-center text-inherit;
 }
+/* 折叠侧栏提示完整落在 64px 边界之外，并覆盖业务内容层。 */
+.n-popover.admin-nav-popover {
+    margin-inline-start: 24px !important;
+}
 .admin-brand {
     @apply flex shrink-0 items-center gap-3 h-[74px] overflow-hidden py-0 px-5 text-ink whitespace-nowrap;
     min-width: var(--admin-sider-expanded);