Darken desktop chat backgrounds and lighter panels

tools/chatgui/src/chatview.cpp

@@ -81,7 +81,9 @@ void ChatView::setBackgroundImage(const QString &path) {
         GUI_WARN("ChatView: failed to load background path=%s", qPrintable(path));
         return;
     }
-    GUI_DEBUG("ChatView: background loaded path=%s size=%dx%d", qPrintable(path), m_background.width(), m_background.height());
+    { QPainter painter(&m_background); painter.fillRect(m_background.rect(), QColor(0, 0, 0, 64)); }
+    GUI_DEBUG("ChatView: background loaded path=%s size=%dx%d black_overlay=64/255",
+              qPrintable(path), m_background.width(), m_background.height());
     viewport()->update();
 }