fix theme / add history

lib/app/app.dart

@@ -14,10 +14,10 @@ class KoolTabApp extends StatelessWidget {
       routerConfig: appRouter,
       // theme: ThemeData(
       //   useMaterial3: false,
-      //   colorSchemeSeed: Colors.redAccent,
-      //   brightness: Brightness.dark,
+      //   colorSchemeSeed: Colors.blueAccent,
+      //   brightness: Brightness.light,
       // ),
-      theme: neoBrutalDarkTheme
+      theme: darkTheme
     );
   }
 }

lib/app/router.dart

@@ -1,16 +1,24 @@
+import 'package:flutter/material.dart';
 import 'package:go_router/go_router.dart';
 
 import '../views/bar_screen_view.dart';
+import '../views/history_screen_view.dart';
 import '../views/product_form_view.dart';
 import '../views/product_list_view.dart';
 
+final RouteObserver<PageRoute> routeObserver = RouteObserver<PageRoute>();
+
 final appRouter = GoRouter(
   initialLocation: '/bar',
+  observers: [
+    routeObserver,
+  ],
   routes: [
     GoRoute(
       path: '/bar',
       builder: (context, state) => const BarScreenView(),
     ),
+
     GoRoute(
       path: '/products',
       builder: (context, state) => const ProductListView(),
@@ -29,5 +37,9 @@ final appRouter = GoRouter(
         ),
       ],
     ),
+    GoRoute(
+      path: '/history',
+      builder: (context, state) => const HistoryScreenView(),
+    ),
   ],
 );