automatic updating of last timestamp for bloc cache

lib/app.dart

@@ -96,6 +96,7 @@ class _AppState extends State<App> with WidgetsBindingObserver {
       controller: App.bottomNavigator,
       navBarOverlap: const NavBarOverlap.none(),
       backgroundColor: Theme.of(context).colorScheme.primary,
+      handleAndroidBackButtonPress: false,
 
       screenTransitionAnimation: const ScreenTransitionAnimation(curve: Curves.easeOutQuad, duration: Duration(milliseconds: 200)),
       tabs: [