refactor(editor): 优化分页符相关代码结构和样式

- 调整分页符渲染部分的代码格式，提升代码可读性
- 增加分页符说明文字，提示导出和打印预览时分页效果
- 优化节点删除逻辑的代码缩进和换行，增强代码清晰度
- 微调部分静态常量导入格式，统一代码风格

src/configs/xmlTags.ts

@@ -222,4 +222,3 @@ export const TRANSLATE_TARGET_TAGS = ['PARAC', 'TITLEC']
 
 // 虚拟辅助排版标签集（不参与 DTD 规则约束，如打印换页符）
 export const VIRTUAL_LAYOUT_TAGS = ['PAGEBREAK']
-

src/views/editor/components/EditorToolbar/constants/index.ts

-import { ImageOutline, GridOutline, DocumentTextOutline, CreateOutline, RemoveOutline, ListOutline, ReturnDownForwardOutline } from '@vicons/ionicons5'
+import {
+    ImageOutline,
+    GridOutline,
+    DocumentTextOutline,
+    CreateOutline,
+    RemoveOutline,
+    ListOutline,
+    ReturnDownForwardOutline
+} from '@vicons/ionicons5'
 
 /**
  * EditorToolbar 组件级静态常量

src/views/editor/components/EditorToolbar/index.vue

@@ -221,7 +221,10 @@
                                     <span class="text-[8px] bg-primary-1 text-primary px-1 rounded font-bold scale-[0.9]">PAGEBREAK</span>
                                 </div>
                                 <div class="flex items-center select-none w-full scale-[0.9] origin-left my-1.5">
-                                    <div class="flex-1 border-t border-dashed" style="border-color: color-mix(in srgb, var(--primary-color) 40%, transparent)"></div>
+                                    <div
+                                        class="flex-1 border-t border-dashed"
+                                        style="border-color: color-mix(in srgb, var(--primary-color) 40%, transparent)"
+                                    ></div>
                                     <span
                                         class="mx-1 text-[8px] px-1 py-0.5 rounded border border-dashed flex-shrink-0"
                                         style="
@@ -232,10 +235,15 @@
                                     >
                                         分页符 [Page Break]
                                     </span>
-                                    <div class="flex-1 border-t border-dashed" style="border-color: color-mix(in srgb, var(--primary-color) 40%, transparent)"></div>
+                                    <div
+                                        class="flex-1 border-t border-dashed"
+                                        style="border-color: color-mix(in srgb, var(--primary-color) 40%, transparent)"
+                                    ></div>
+                                </div>
                             </div>
+                            <div class="text-[10px] text-color3 mt-2 text-center leading-relaxed">
+                                在选定节点下方插入分页标记，导出和打印预览时在该处换页。
                             </div>
-                            <div class="text-[10px] text-color3 mt-2 text-center leading-relaxed">在选定节点下方插入分页标记，导出和打印预览时在该处换页。</div>
                         </template>
                     </div>
                 </div>

src/views/editor/components/NodeTree/functionals/index.ts

@@ -855,7 +855,8 @@ export function useNodeTree(
 
         // 删除节点（受 DTD 约束，文本节点和分页符节点永远允许删除）
         if (parent) {
-            const deletable = (isVirtual || VIRTUAL_LAYOUT_TAGS.includes(node.tagName))
+            const deletable =
+                isVirtual || VIRTUAL_LAYOUT_TAGS.includes(node.tagName)
                     ? true
                     : (() => {
                           const existingTags = parent.children.filter((c) => !VIRTUAL_LAYOUT_TAGS.includes(c.tagName)).map((c) => c.tagName)