Normalize architecture

android/gradle.properties

assets/translations/en.json

assets/translations/fr.json

lib/config/app_colors.dart

lib/main.dart

lib/ui/painters/graph_painter.dart

lib/ui/screens/about_page.dart

lib/ui/screens/demo_page.dart

lib/ui/screens/graph_page.dart

lib/ui/screens/settings_page.dart

lib/ui/screens/skeleton_screen.dart

lib/ui/widgets/app_bar.dart

lib/ui/widgets/bottom_nav_bar.dart

lib/ui/widgets/custom_app_bar.dart

lib/ui/widgets/error.dart

lib/ui/widgets/header.dart

lib/ui/widgets/settings_form.dart

pubspec.yaml