feat(webui): show forked history boundary

webui/src/i18n/locales/zh-CN/common.json

@@ -509,6 +509,7 @@
   },
   "chat": {
     "fallbackTitle": "对话 {{id}}",
+    "forkTitle": "分叉：{{title}}",
     "loading": "加载中…",
     "noSessions": "还没有会话。",
     "showMore": "再显示 {{count}} 个",
@@ -811,7 +812,8 @@
     "scrollToBottom": "滚动到底部",
     "loadEarlier": "加载更早消息",
     "fork": {
-      "failed": "无法分叉这个对话，请重试。"
+      "failed": "无法分叉这个对话，请重试。",
+      "fromHistory": "从历史消息分叉"
     },
     "promptNavigator": {
       "open": "打开输入导航",
@@ -852,11 +854,11 @@
     "imageAttachment": "图片附件",
     "automationSourceFallback": "自动化",
     "automationTriggered": "自动触发",
-    "copyMessage": "复制消息",
-    "copiedMessage": "已复制消息",
-    "forkFromHere": "从这里分叉",
-    "copyReply": "复制回复",
-    "copiedReply": "已复制回复",
+    "copyMessage": "复制",
+    "copiedMessage": "已复制",
+    "forkFromHere": "分叉",
+    "copyReply": "复制",
+    "copiedReply": "已复制",
     "turnLatencyTitle": "本轮耗时（端到端）"
   },
   "lightbox": {