feat: 优化知识库分块操作区与滚动导航

- 将向量化操作上移到分块预览前的统一操作区

- 增加页顶页末双气泡并完善边界禁用状态

easyflow-ui-admin/packages/effects/layouts/src/basic/layout.vue

@@ -425,7 +425,11 @@ const headerSlots = computed(() => {
           @clear-preferences-and-logout="clearPreferencesAndLogout"
         />
       </template>
-      <EasyFlowBackTop />
+      <EasyFlowBackTop
+        :bottom-label="$t('button.goToBottom')"
+        is-group
+        :top-label="$t('button.backToTop')"
+      />
     </template>
   </EasyFlowAdminLayout>
 </template>