第七轮深度测试：修复7个agent发现的12处前端问题，重点是列表分页截断与呼叫/播放状态机

- 通话状态机（Ch8）：canStartCall 补齐通话中重复发起的防护，callShouldStart 补齐放弃/失败路径的清理
- 分页截断（Ch5-6）：新增 fetchAllPages 辅助函数，修复通讯录/黑名单/好友申请/群成员/管理员/禁言等
  11 处列表只读首页导致真实成员被遗漏的问题；群角色判断改用不受分页影响的 getGroup().my_role
- 消息与媒体（Ch3-4/Ch7/Ch9）：录音超时污染时长、手动重试丢失 head 导致消息被错误分类、批量删除
  未取消上传中附件、语音播放器补齐同时只能播一条、workplace-collaboration-view 冗余重试请求
- 独立密码/青少年模式（Ch10-11）：设置密码后按调用来源判断是否应自动开启青少年模式，避免关闭流程
  中途"忘记密码"被误当成开启；注销账号确认文案补充群主后果说明

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/widgets/audio-player.jsx

@@ -19,6 +19,11 @@ const THUMB_COLOR = '#1781d7'; // average between dark and light accent colors.
 // Minimum number of amplitude bars to draw.
 const MIN_PREVIEW_LENGTH = 16;
 
+// 7.5 "列表中同时只能有一条语音播放"：favorites/history 列表和聊天气泡里的每条语音各自是一个独立
+// AudioPlayer 实例，彼此不知道对方的存在。Module-scoped（不是某个列表父组件的 state）所以跨 tab、
+// 跨收藏/聊天记录也生效，不只是同一个列表内部。
+let activeAudioPlayer = null;
+
 const messages = defineMessages({
   icon_title_play: {
     id: 'icon_title_play',
@@ -69,6 +74,9 @@ class AudioPlayer extends React.PureComponent {
   }
 
   componentWillUnmount() {
+    if (activeAudioPlayer === this) {
+      activeAudioPlayer = null;
+    }
     if (this.audioPlayer) {
       this.audioPlayer.onloadedmetadata = null;
       this.audioPlayer.ontimeupdate = null;
@@ -78,6 +86,14 @@ class AudioPlayer extends React.PureComponent {
     }
   }
 
+  // Called on the previously-playing instance by whichever other instance is about to start.
+  pauseForOtherPlayer() {
+    if (this.audioPlayer) {
+      this.audioPlayer.pause();
+    }
+    this.setState({playing: false});
+  }
+
   componentDidUpdate(prevProps) {
     if (this.props.src != prevProps.src) {
       this.initAudio();
@@ -100,7 +116,10 @@ class AudioPlayer extends React.PureComponent {
     });
     this.audioPlayer.onended = _ => {
       this.audioPlayer.currentTime = 0;
-      this.setState({playing: false, currentTime: secondsToTime(0, this.state.longMin)})
+      this.setState({playing: false, currentTime: secondsToTime(0, this.state.longMin)});
+      if (activeAudioPlayer === this) {
+        activeAudioPlayer = null;
+      }
     }
   }