fix(agent): 修复声音条动画显示条件判断

添加shouldShowAnimation变量来同时判断isListening和isPushToTalkActive状态，确保在两种情况下都能正确显示动画

lib/modules/agent/widgets/sound_bar_widget.dart

@@ -134,8 +134,10 @@ class AgentSoundBarsWidget extends StatelessWidget {
   Widget build(BuildContext context) {
     return Obx(() {
       final controller = Get.find<AgentController>();
+      final shouldShowAnimation =
+          controller.isListening.value || controller.isPushToTalkActive.value;
       return SoundBarsWidget(
-        isActive: controller.isListening.value,
+        isActive: shouldShowAnimation,
         barCount: barCount,
       );
     });