fix: render error for tag icons in AppInfoPage

SVG render error in Qt6, so fallback to use PNG;
add CustomLabel for render PNG not blurry with HIDPI

Log: add PNG resources for tag icons;
add CustomLabel class for PNG rendering

src/widgets/common/customlabel.cpp

@@ -0,0 +1,25 @@
+#include "customlabel.h"
+
+#include <QGuiApplication>
+
+CustomLabel::CustomLabel(QWidget *parent,
+                         Qt::WindowFlags f)
+    : QLabel(parent, f)
+{
+}
+
+QPixmap CustomLabel::pixmap() const
+{
+    return QLabel::pixmap();
+}
+
+void CustomLabel::setPixmap(const QPixmap &pixmap)
+{
+    QPixmap _pixmap = pixmap;
+    _pixmap.setDevicePixelRatio(qApp->devicePixelRatio());
+    _pixmap = _pixmap.scaled(size() * _pixmap.devicePixelRatio(),
+                             Qt::KeepAspectRatio,
+                             Qt::SmoothTransformation);
+
+    QLabel::setPixmap(_pixmap);
+}