feat: change application style

- change default dark theme to light
- disable dark mode on windows 10 because Qt's windows 11 theme has bad support on windows 10 (icon display error)
- level required minimum qt version up to 6.5 for color schema.

app/bottombuttongroup.h

@@ -15,8 +15,6 @@ class BottomButtonGroup : public QGroupBox
     Q_OBJECT
 public:
     explicit BottomButtonGroup(const std::vector<QAction *> & actionList, QWidget *parent = nullptr);
-
-    void addButton(QAbstractButton *button);
 };
 
 #endif // BOTTOMBUTTONGROUP_H