feat: 使用dbus支持kde的暗色模式

src/mainwindow-dtk.h

@@ -30,6 +30,8 @@ public:
     void openUrl(const QString &url);
 
     bool isCloseWindowAnimation();
+    void refreshTheme(bool isDarkMode);
+
 
 protected:
     void closeEvent(QCloseEvent *event) override;
@@ -48,6 +50,7 @@ private:
 
 public slots:
     void notify(QObject *receiver, QEvent *event);
+    void onThemeChanged(bool isDark);
 
 private slots:
     //接受来自dbus的url