Use WindowModality for dialogs

src/components.cpp

@@ -113,4 +113,10 @@ ClickableLabel::~ClickableLabel() = default;
 
 void ClickableLabel::mousePressEvent(QMouseEvent* event) {
     emit clicked();
+}
+
+WindowModalDialog::WindowModalDialog(QWidget *parent)
+    : QDialog(parent)
+{
+    this->setWindowModality(Qt::WindowModal);
 }