feat: save repeat audio on mic record and rename button to play repeat

kouyu_english/lib/features/dialogue/dialogue_flow.dart

@@ -377,6 +377,7 @@ class _DialoguePageState extends State<DialoguePage> {
         aiVoiceRecording = false;
         listening = false;
         transcribing = true;
+        recordingPath = path;
       });
       if (path != null) {
         final config = widget.state.aiConfig;
@@ -489,8 +490,12 @@ class _DialoguePageState extends State<DialoguePage> {
     final path = recordingPath;
     if (path == null) return;
     setState(() => playingRecording = true);
-    await VoiceService.instance.playRecording(path);
-    if (mounted) setState(() => playingRecording = false);
+    await VoiceService.instance.playRecording(
+      path,
+      onComplete: () {
+        if (mounted) setState(() => playingRecording = false);
+      },
+    );
   }
 
   Future<void> _deleteRecording() async {