fix: macOS Window Title And Accessibility Focus (#14472)

- Override accessibility method in atom_ns_window
- Add title attribute in accessibilityAttributeValue

atom/browser/ui/cocoa/atom_ns_window.h

@@ -7,6 +7,7 @@
 
 #include "brightray/browser/mac/event_dispatching_window.h"
 #include "ui/views/cocoa/native_widget_mac_nswindow.h"
+#include "ui/views/widget/native_widget_mac.h"
 
 namespace atom {
 
@@ -40,6 +41,7 @@ class ScopedDisableResize {
 - (id)initWithShell:(atom::NativeWindowMac*)shell
           styleMask:(NSUInteger)styleMask;
 - (atom::NativeWindowMac*)shell;
+- (id)accessibilityFocusedUIElement;
 - (NSRect)originalContentRectForFrameRect:(NSRect)frameRect;
 - (void)enableWindowButtonsOffset;
 - (void)toggleFullScreenMode:(id)sender;