chore: Waveform follow up

lib/pages/chat/events/audio_player.dart

@@ -142,7 +142,7 @@ class _AudioPlayerState extends State<AudioPlayerWidget> {
     return '${duration.inMinutes.toString().padLeft(2, '0')}:${(duration.inSeconds % 60).toString().padLeft(2, '0')}';
   }
 
-  List<int> get waveform {
+  List<int> _getWaveform() {
     final eventWaveForm = widget.event.content
         .tryGetMap<String, dynamic>('org.matrix.msc1767.audio')
         ?.tryGetList<int>('waveform');
@@ -163,6 +163,14 @@ class _AudioPlayerState extends State<AudioPlayerWidget> {
     return eventWaveForm;
   }
 
+  late final List<int> waveform;
+
+  @override
+  void initState() {
+    super.initState();
+    waveform = _getWaveform();
+  }
+
   @override
   Widget build(BuildContext context) {
     final statusText = this.statusText ??= _durationString ?? '00:00';

lib/pages/chat/recording_dialog.dart

@@ -125,7 +125,6 @@ class _RecordingDialogState extends State<RecordingDialog> {
                 ),
               ),
               Expanded(
-                child: Center(
                 child: Row(
                   mainAxisSize: MainAxisSize.min,
                   mainAxisAlignment: MainAxisAlignment.end,
@@ -145,8 +144,11 @@ class _RecordingDialogState extends State<RecordingDialog> {
                       .toList(),
                 ),
               ),
+              const SizedBox(width: 8),
+              SizedBox(
+                width: 48,
+                child: Text(time),
               ),
-              Text(time),
             ],
           );
     if (PlatformInfos.isCupertinoStyle) {