add support for network calculation from the calculator

lib/components/calculator/route_summary_widget.dart

@@ -40,6 +40,7 @@ class RouteDetailsView extends StatelessWidget {
   final List<double> costs;
   final VoidCallback onBack;
   final Set<String> routingPoints;
+  final VoidCallback? onNetworksPressed;
 
   const RouteDetailsView({
     super.key,
@@ -47,6 +48,7 @@ class RouteDetailsView extends StatelessWidget {
     required this.costs,
     required this.onBack,
     this.routingPoints = const {},
+    this.onNetworksPressed,
   });
 
   @override
@@ -56,13 +58,21 @@ class RouteDetailsView extends StatelessWidget {
     final mutedColor = Theme.of(context).colorScheme.outlineVariant;
     return Column(
       children: [
-        Align(
-          alignment: Alignment.centerLeft,
-          child: TextButton.icon(
-            onPressed: onBack,
-            icon: const Icon(Icons.arrow_back),
-            label: const Text('Back'),
-          ),
+        Row(
+          children: [
+            TextButton.icon(
+              onPressed: onBack,
+              icon: const Icon(Icons.arrow_back),
+              label: const Text('Back'),
+            ),
+            const Spacer(),
+            if (onNetworksPressed != null)
+              TextButton.icon(
+                onPressed: onNetworksPressed,
+                icon: const Icon(Icons.account_tree),
+                label: const Text('Networks'),
+              ),
+          ],
         ),
         Expanded(
           child: ListView.builder(