add ability for non admins to add new traction, pending approval. Various QoL updates

lib/components/pages/stats.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:go_router/go_router.dart';
 import 'package:intl/intl.dart';
 import 'package:mileograph_flutter/objects/objects.dart';
 import 'package:mileograph_flutter/services/data_service.dart';
@@ -32,7 +33,21 @@ class _StatsPageState extends State<StatsPage> {
     final data = context.watch<DataService>();
     final distanceUnits = context.watch<DistanceUnitService>();
     return Scaffold(
-      appBar: AppBar(title: const Text('Stats')),
+      appBar: AppBar(
+        leading: IconButton(
+          icon: const Icon(Icons.arrow_back),
+          onPressed: () {
+            final nav = Navigator.of(context);
+            if (nav.canPop()) {
+              nav.maybePop();
+            } else {
+              context.go('/more');
+            }
+          },
+          tooltip: 'Back',
+        ),
+        title: const Text('Stats'),
+      ),
       body: RefreshIndicator(
         onRefresh: () => _loadStats(force: true),
         child: _buildContent(data, distanceUnits),