Add ability to select distance unit

lib/components/pages/legs.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:mileograph_flutter/components/legs/leg_card.dart';
 import 'package:mileograph_flutter/objects/objects.dart';
 import 'package:mileograph_flutter/services/data_service.dart';
+import 'package:mileograph_flutter/services/distance_unit_service.dart';
 import 'package:provider/provider.dart';
 
 class LegsPage extends StatefulWidget {
@@ -90,6 +91,7 @@ class _LegsPageState extends State<LegsPage> {
   @override
   Widget build(BuildContext context) {
     final data = context.watch<DataService>();
+    final distanceUnits = context.watch<DistanceUnitService>();
     final legs = data.legs;
     final pageMileage = _pageMileage(legs);
 
@@ -121,7 +123,7 @@ class _LegsPageState extends State<LegsPage> {
                     children: [
                       Text('Page mileage',
                           style: Theme.of(context).textTheme.labelSmall),
-                      Text('${pageMileage.toStringAsFixed(1)} mi',
+                      Text(distanceUnits.format(pageMileage, decimals: 1),
                           style: Theme.of(context)
                               .textTheme
                               .titleMedium
@@ -212,7 +214,7 @@ class _LegsPageState extends State<LegsPage> {
           else
             Column(
               children: [
-                ..._buildLegsWithDividers(context, legs),
+                ..._buildLegsWithDividers(context, legs, distanceUnits),
                 const SizedBox(height: 8),
                 if (data.legsHasMore || data.isLegsLoading)
                   Align(
@@ -239,7 +241,11 @@ class _LegsPageState extends State<LegsPage> {
     );
   }
 
-  List<Widget> _buildLegsWithDividers(BuildContext context, List<Leg> legs) {
+  List<Widget> _buildLegsWithDividers(
+    BuildContext context,
+    List<Leg> legs,
+    DistanceUnitService distanceUnits,
+  ) {
     final widgets = <Widget>[];
     String? currentDate;
     double dayMileage = 0;
@@ -261,10 +267,8 @@ class _LegsPageState extends State<LegsPage> {
                       ),
                 ),
               ),
-              Text(
-                '${dayMileage.toStringAsFixed(1)} mi',
-                style: Theme.of(context).textTheme.labelMedium,
-              ),
+              Text(distanceUnits.format(dayMileage, decimals: 1),
+                  style: Theme.of(context).textTheme.labelMedium),
             ],
           ),
         ),