fix(asr): 修复语音识别麦克风超时重启问题

- 移除启动麦克风时的重复超时重启调用
- 在显示监听对话框后正确重启超时计时器
- 确保麦克风状态变化时的超时管理一致性

app/src/main/java/com/nova/brain/glass/helper/AsrHelper.kt

@@ -155,7 +155,6 @@ object AsrHelper : OfflineCmdListener {
             Log.w(TAG, "ASR startMic ignored: mic already running")
             return
         }
-        restartListeningTimeout()
         runCatching { asr?.startAsrWithMic() }
             .onSuccess {
                 isMicRunning = true
@@ -377,6 +376,7 @@ object AsrHelper : OfflineCmdListener {
                 return
             }
             showListeningDialog()
+            restartListeningTimeout()
             pendingStartMic = true
             if (isTtsConnected) {
                 tts?.speak(WAKE_RESPONSE)