refactor: use ui file to replace manual layout in metadata dialog

app/metadatadialog.h

@@ -11,6 +11,12 @@ QT_BEGIN_NAMESPACE
 class QTreeView;
 QT_END_NAMESPACE
 
+QT_BEGIN_NAMESPACE
+namespace Ui {
+class MetadataDialog;
+}
+QT_END_NAMESPACE
+
 class MetadataModel;
 class MetadataDialog : public QDialog
 {
@@ -25,6 +31,7 @@ public:
 
 private:
     QTreeView * m_treeView = nullptr;
+    QT_PREPEND_NAMESPACE(Ui::MetadataDialog) *ui;
 };
 
 #endif // METADATADIALOG_H