Initial (redacted) commit.

app/lib/infrastructure/bottom_navigation.dart

@@ -0,0 +1,42 @@
+import 'package:flutter/material.dart';
+
+import 'package:go_router/go_router.dart';
+
+class ScaffoldWithBottomNavigationBar extends StatelessWidget {
+  const ScaffoldWithBottomNavigationBar({
+    required this.navigationShell,
+    Key? key,
+  }) : super(key: key ?? const ValueKey<String>('ScaffoldWithNavBar'));
+
+  final StatefulNavigationShell navigationShell;
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: SafeArea(child: navigationShell),
+      bottomNavigationBar: BottomNavigationBar(
+        fixedColor: Theme.of(context).colorScheme.onPrimary,
+        backgroundColor: Theme.of(context).colorScheme.secondary,
+        items: const <BottomNavigationBarItem>[
+          BottomNavigationBarItem(
+            icon: Icon(Icons.list),
+            label: 'Widget Wall',
+          ),
+          BottomNavigationBarItem(
+            icon: Icon(Icons.dashboard),
+            label: 'Dashboard',
+          ),
+        ],
+        currentIndex: navigationShell.currentIndex,
+        onTap: (int index) => _onTap(context, index),
+      ),
+    );
+  }
+
+  void _onTap(BuildContext context, int index) {
+    navigationShell.goBranch(
+      index,
+      initialLocation: index == navigationShell.currentIndex,
+    );
+  }
+}