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.h

@@ -0,0 +1,19 @@
+#ifndef CUSTOMLABEL_H
+#define CUSTOMLABEL_H
+
+#include <QLabel>
+
+class CustomLabel : public QLabel
+{
+    Q_OBJECT
+    Q_PROPERTY(QPixmap pixmap READ pixmap WRITE setPixmap)
+
+public:
+    explicit CustomLabel(QWidget *parent = nullptr,
+                         Qt::WindowFlags f = Qt::WindowFlags());
+
+    virtual QPixmap pixmap() const;
+    virtual void setPixmap(const QPixmap &pixmap);
+};
+
+#endif // CUSTOMLABEL_H