[功能请求] 隐藏有新帖红字对在消息列表的频道生效

### QQ(TIM)版本/QQ(TIM) Version

9.0.60

### 为什么你认为需要此功能

碍眼

### 联系到哪些已经存在的bug或者功能

隐藏有新帖红字

### 具体功能需要/Specific features require

隐藏有新帖红字对在消息列表的频道生效

Start by locating the existing implementation for hiding the red “new posts” text and the message-list handling for channels in QQ/TIM 9.0.60. Confirm how channel entries are represented, then verify that the same hiding behavior applies to them without changing other message-list indicators.

Written by the indexing model from the issue text.