add new traction page

lib/main.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:dynamic_color/dynamic_color.dart';
 import 'package:mileograph_flutter/components/pages/calculator.dart';
 import 'package:mileograph_flutter/components/pages/new_entry.dart';
+import 'package:mileograph_flutter/components/pages/new_traction.dart';
 import 'package:mileograph_flutter/components/pages/traction.dart';
 import 'package:mileograph_flutter/components/pages/trips.dart';
 import 'package:provider/provider.dart';
@@ -93,6 +94,10 @@ class MyApp extends StatelessWidget {
             ),
             GoRoute(path: '/legs', builder: (_, __) => LegsPage()),
             GoRoute(path: '/traction', builder: (_, __) => TractionPage()),
+            GoRoute(
+              path: '/traction/new',
+              builder: (_, __) => const NewTractionPage(),
+            ),
             GoRoute(path: '/trips', builder: (_, __) => TripsPage()),
             GoRoute(path: '/add', builder: (_, __) => NewEntryPage()),
           ],
@@ -164,7 +169,11 @@ class _MyHomePageState extends State<MyHomePage> {
   ];
 
   int _getIndexFromLocation(String location) {
-    int newIndex = contentPages.indexWhere((path) => location == path);
+    int newIndex = contentPages.indexWhere((path) {
+      if (location == path) return true;
+      if (path == '/') return location == '/';
+      return location.startsWith('$path/');
+    });
     if (newIndex < 0) {
       return 0;
     }
@@ -188,19 +197,19 @@ class _MyHomePageState extends State<MyHomePage> {
 
     if (!_fetched) {
       _fetched = true;
-          WidgetsBinding.instance.addPostFrameCallback((_) {
-            Future(() async {
-              final data = context.read<DataService>();
-              final auth = context.read<AuthService>();
-              api.setTokenProvider(() => auth.token);
-              await auth.tryRestoreSession();
-              if (!auth.isLoggedIn) return;
-              data.fetchEventFields();
-              if (data.homepageStats == null) {
-                data.fetchHomepageStats();
-              }
-              if (data.legs.isEmpty) {
-                data.fetchLegs();
+      WidgetsBinding.instance.addPostFrameCallback((_) {
+        Future(() async {
+          final data = context.read<DataService>();
+          final auth = context.read<AuthService>();
+          api.setTokenProvider(() => auth.token);
+          await auth.tryRestoreSession();
+          if (!auth.isLoggedIn) return;
+          data.fetchEventFields();
+          if (data.homepageStats == null) {
+            data.fetchHomepageStats();
+          }
+          if (data.legs.isEmpty) {
+            data.fetchLegs();
           }
           if (data.traction.isEmpty) {
             data.fetchHadTraction();