fix: waveform repaint via viewport()->update() instead of activeWindow()

- Timer now calls s_voiceView->viewport()->update() for correct delegate repaint
- s_voiceView captured from option.widget in paint() voice section
- Previously activeWindow()->update() didn't reach QListView viewport

tools/chatgui/src/messagedelegate.cpp

@@ -32,6 +32,7 @@ struct VoicePlayState {
 };
 static QMap<QString, VoicePlayState> s_voiceStates;
 static QTimer* s_voiceTimer = nullptr;
+static QAbstractItemView* s_voiceView = nullptr;
 
 static void ensureVoiceTimer() {
     if (!s_voiceTimer) {
@@ -56,7 +57,7 @@ static void ensureVoiceTimer() {
                 }
             }
             if (!anyPlaying) s_voiceTimer->stop();
-            if (auto* w = QApplication::activeWindow()) w->update();
+            if (s_voiceView) s_voiceView->viewport()->update();
         });
     }
 }
@@ -603,6 +604,7 @@ void MessageDelegate::paint(QPainter *painter, const QStyleOptionViewItem &optio
     }
 
     if (L.isVoice) {
+        if (option.widget) s_voiceView = (QAbstractItemView*)option.widget;
         drawBubble(painter, L, option);
         if (!L.narrow) drawAvatar(painter, L, index);