fix: proper svg icon rendering on hidpi screen.

app/bottombuttongroup.cpp

@@ -37,7 +37,7 @@ BottomButtonGroup::BottomButtonGroup(const std::vector<QAction *> &actionList, Q
     auto newActionBtn = [this](QAction * action) -> QToolButton * {
         QToolButton * btn = new QToolButton(this);
         btn->setDefaultAction(action);
-        btn->setIconSize(QSize(40, 40));
+        btn->setIconSize(QSize(32, 32));
         btn->setFixedSize(40, 40);
         return btn;
     };