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/app/src/locales/langs/en-US/button.json

@@ -51,6 +51,8 @@
   "submitPublishApproval": "Submit Publish Approval",
   "viewSegmentation": "View Segments",
   "continueProcess": "Continue",
+  "backToTop": "Back to top",
+  "goToBottom": "Go to bottom",
   "startIndex": "Start Indexing",
   "retryParse": "Retry Parse",
   "retryIndex": "Retry Index"

easyflow-ui-admin/app/src/locales/langs/zh-CN/button.json

@@ -51,6 +51,8 @@
   "submitPublishApproval": "提交发布审批",
   "viewSegmentation": "查看分段",
   "continueProcess": "继续处理",
+  "backToTop": "回到页顶",
+  "goToBottom": "到达页末",
   "startIndex": "开始向量化",
   "retryParse": "重试解析",
   "retryIndex": "重试向量化"