refactor: update navigation to use push/pop and add conditional dashboard redirection for agents

lib/features/about/presentation/screens/about_screen.dart

@@ -847,7 +847,9 @@ class AboutScreen extends ConsumerWidget {
             ),
             alignment: Alignment.center,
             child: Text(
-              cta.buttonText,
+              (ref.read(authProvider).user?.role == 'AGENT')
+                  ? 'Go to Dashboard'
+                  : cta.buttonText,
               style: const TextStyle(
                 fontFamily: 'Fractul',
                 fontSize: 16,