splash screen to black screen

[PJPAC]

Hi,
I'm learning dart and flutter with an interest in clean architecture. For this reason, I'm testing and trying to understand existing apps, which led me to download SuperShop as a zip file and to open with Android Studio.
I would like to take advantage of this message to thank you for having shared your SuperShop app code.

I've notice a few updates which I could address such as

• In lib/core/components/custom_app_bar.dart, 'the class 'PreferredSizeWidget' can't be used as a mixin because it's neither a mixin class nor a mixin' led to replace with by implements.
• in main.dart,
  * isDark ?? false; became isDark ??= false;
  * I've uncommented the dataLanguage section, and replaced ?? by ??=
• In test/widget_test.dart, 'A value of type 'Null' can't be assigned to a parameter of type 'Widget' in a const constructor.' led to replace
  await tester.pumpWidget(const MyApp());
  by

     await tester.pumpWidget(MyApp(
        startWidget: HomeScreen(),
        isDark: true,
        language: 'en',
     ));

The app starts apparently fine, there are neither warnings nor error messages, the splash screen pops up and is removed but nothing else happens. I touch my phone screen and then on the console I read the following lines

I/ViewRootImpl@32b5226MainActivity: ViewPostIme pointer 0
I/ViewRootImpl@32b5226MainActivity: ViewPostIme pointer 1

It is as if the app was going through

     runApp(
        initialLocalization(
            child: MyApp(
          ...
        )),
      );

just fine but was not landing on any relevant screen.

That said I could not identify the issue and a fix, so that I would welcome any suggestion.

Many Thanks & Best Wishes
PAscal