ui: Styled code navigation

* Defined final icons and colors for code navigation buttons
* Added disabled color for all buttons in search and code navigation UI

src/lib_gui/qt/view/QtCodeView.cpp

@@ -46,6 +46,8 @@ void QtCodeView::refreshView()
 		{
 			setStyleSheet();
 
+			m_widget->refreshStyle();
+
 			QtCodeArea::clearAnnotationColors();
 			QtHighlighter::clearHighlightingRules();
 		}