fix(chat): 修复聊天界面中标题分隔线显示问题

- 将标题分隔线设置为始终隐藏状态
- 注释掉原有的条件性显示逻辑以防止分隔线异常显示

app/src/main/java/com/nova/brain/glass/ui/ChatActivity.kt

@@ -88,7 +88,8 @@ class ChatActivity : BaseListFormLayoutNormalActivity<ChatItem, ChatVM, Activity
             holder.itemView.layoutParams = holder.itemView.layoutParams.also {
                 it.height = ViewGroup.LayoutParams.WRAP_CONTENT
             }
-            holder.setVisibility(R.id.line, position != 0)
+            holder.setVisibility(R.id.line, false)
+//            holder.setVisibility(R.id.line, position != 0)
             holder.setText(R.id.title, liveItem.title)
             val tv = holder.getView<TextView>(R.id.content)
             markwon.setMarkdown(tv, liveItem.content)