fix: 语音播放修复（AudioAttributes + clickable + 日志）

- 设置 AudioAttributes（CONTENT_TYPE_SPEECH）确保音频输出正确
- 按钮加 clickable/focusable 防止被 ScrollView 手势拦截
- 添加播放日志便于排查

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/src/main/java/com/xiaoqu/watch/ui/task/TaskListFragment.kt

@@ -405,12 +405,22 @@ class TaskListFragment : BaseFragment<FragmentTaskListBinding>() {
         } else {
             stopVoice()  // 清理上一个
             updateVoiceUI(true)
+            Timber.d("语音播放: $url")
             mediaPlayer = MediaPlayer().apply {
+                setAudioAttributes(
+                    android.media.AudioAttributes.Builder()
+                        .setContentType(android.media.AudioAttributes.CONTENT_TYPE_SPEECH)
+                        .setUsage(android.media.AudioAttributes.USAGE_MEDIA)
+                        .build()
+                )
                 setDataSource(url)
-                setOnPreparedListener { start() }
+                setOnPreparedListener {
+                    Timber.d("语音准备完成，开始播放")
+                    start()
+                }
                 setOnCompletionListener { stopVoice() }
-                setOnErrorListener { _, _, _ ->
-                    Timber.w("语音播放失败: $url")
+                setOnErrorListener { _, what, extra ->
+                    Timber.w("语音播放失败: what=$what, extra=$extra, url=$url")
                     stopVoice()
                     true
                 }