Add ability to select distance unit

lib/components/pages/dashboard.dart

@@ -7,6 +7,7 @@ import 'package:mileograph_flutter/components/dashboard/top_traction_panel.dart'
 import 'package:mileograph_flutter/objects/objects.dart';
 import 'package:mileograph_flutter/services/authservice.dart';
 import 'package:mileograph_flutter/services/data_service.dart';
+import 'package:mileograph_flutter/services/distance_unit_service.dart';
 import 'package:provider/provider.dart';
 
 class Dashboard extends StatefulWidget {
@@ -23,6 +24,7 @@ class _DashboardState extends State<Dashboard> {
   Widget build(BuildContext context) {
     final data = context.watch<DataService>();
     final auth = context.watch<AuthService>();
+    final distanceUnits = context.watch<DistanceUnitService>();
     final stats = data.homepageStats;
 
     final isInitialLoading = data.isHomepageLoading || stats == null;
@@ -46,9 +48,15 @@ class _DashboardState extends State<Dashboard> {
               ListView(
                 padding: const EdgeInsets.all(16),
                 children: [
-                  _buildHero(context, auth, data, stats),
+                  _buildHero(context, auth, data, stats, distanceUnits),
                   const SizedBox(height: spacing),
-                  _buildTiles(context, data, maxWidth, spacing),
+                  _buildTiles(
+                    context,
+                    data,
+                    distanceUnits,
+                    maxWidth,
+                    spacing,
+                  ),
                 ],
               ),
               if (isInitialLoading)
@@ -81,6 +89,7 @@ class _DashboardState extends State<Dashboard> {
     AuthService auth,
     DataService data,
     HomepageStats? stats,
+    DistanceUnitService distanceUnits,
   ) {
     final colorScheme = Theme.of(context).colorScheme;
     final greetingName =
@@ -119,14 +128,14 @@ class _DashboardState extends State<Dashboard> {
                 _metricTile(
                   context,
                   label: 'Total mileage',
-                  value: '${totalMileage.toStringAsFixed(1)} mi',
+                  value: distanceUnits.format(totalMileage, decimals: 1),
                   icon: Icons.route,
                   color: colorScheme.onPrimaryContainer,
                 ),
                 _metricTile(
                   context,
                   label: 'This year',
-                  value: '${currentYearMileage.toStringAsFixed(1)} mi',
+                  value: distanceUnits.format(currentYearMileage, decimals: 1),
                   icon: Icons.calendar_today,
                   color: colorScheme.onPrimaryContainer,
                 ),
@@ -215,6 +224,7 @@ class _DashboardState extends State<Dashboard> {
   Widget _buildTiles(
     BuildContext context,
     DataService data,
+    DistanceUnitService distanceUnits,
     double maxWidth,
     double spacing,
   ) {
@@ -229,9 +239,9 @@ class _DashboardState extends State<Dashboard> {
             child: Column(
               crossAxisAlignment: CrossAxisAlignment.stretch,
               children: [
-                _buildOnThisDayCard(context, data),
+                _buildOnThisDayCard(context, data, distanceUnits),
                 const SizedBox(height: 16),
-                _buildTripsCard(context, data),
+                _buildTripsCard(context, data, distanceUnits),
                 const SizedBox(height: 16),
                 const LatestLocoChangesPanel(expanded: true),
               ],
@@ -256,13 +266,13 @@ class _DashboardState extends State<Dashboard> {
     return Column(
       crossAxisAlignment: CrossAxisAlignment.stretch,
       children: [
-        _buildOnThisDayCard(context, data),
+        _buildOnThisDayCard(context, data, distanceUnits),
         const SizedBox(height: 16),
         const TopTractionPanel(),
         const SizedBox(height: 16),
         const LeaderboardPanel(),
         const SizedBox(height: 16),
-        _buildTripsCard(context, data),
+        _buildTripsCard(context, data, distanceUnits),
         const SizedBox(height: 16),
         const LatestLocoChangesPanel(),
       ],
@@ -296,7 +306,8 @@ class _DashboardState extends State<Dashboard> {
     );
   }
 
-  Widget _buildOnThisDayCard(BuildContext context, DataService data) {
+  Widget _buildOnThisDayCard(
+      BuildContext context, DataService data, DistanceUnitService distanceUnits) {
     final filtered = data.onThisDay
         .where((leg) => leg.beginTime.year != DateTime.now().year)
         .toList();
@@ -329,7 +340,7 @@ class _DashboardState extends State<Dashboard> {
           : Column(
               children: [
                 for (int idx = 0; idx < visible.length; idx++) ...[
-                  _otdRow(context, visible[idx], textTheme),
+                  _otdRow(context, visible[idx], textTheme, distanceUnits),
                   if (idx != visible.length - 1) const Divider(height: 12),
                 ],
               ],
@@ -337,7 +348,8 @@ class _DashboardState extends State<Dashboard> {
     );
   }
 
-  Widget _otdRow(BuildContext context, Leg leg, TextTheme textTheme) {
+  Widget _otdRow(BuildContext context, Leg leg, TextTheme textTheme,
+      DistanceUnitService distanceUnits) {
     final traction = leg.locos;
     return Row(
       crossAxisAlignment: CrossAxisAlignment.center,
@@ -443,7 +455,7 @@ class _DashboardState extends State<Dashboard> {
           crossAxisAlignment: CrossAxisAlignment.end,
           children: [
             Text(
-              '${leg.mileage.toStringAsFixed(1)} mi',
+              distanceUnits.format(leg.mileage, decimals: 1),
               style: textTheme.labelLarge?.copyWith(
                 fontWeight: FontWeight.w800,
               ),
@@ -498,7 +510,8 @@ class _DashboardState extends State<Dashboard> {
     );
   }
 
-  Widget _buildTripsCard(BuildContext context, DataService data) {
+  Widget _buildTripsCard(
+      BuildContext context, DataService data, DistanceUnitService distanceUnits) {
     final tripsUnsorted = data.trips;
     List trips = [];
     if (tripsUnsorted.isNotEmpty) {
@@ -543,7 +556,7 @@ class _DashboardState extends State<Dashboard> {
                                   ?.copyWith(fontWeight: FontWeight.w700),
                             ),
                             Text(
-                              '${trip.tripMileage.toStringAsFixed(1)} mi',
+                              distanceUnits.format(trip.tripMileage, decimals: 1),
                               style: Theme.of(context).textTheme.labelMedium,
                             ),
                           ],