re add calculator page

lib/ui/app_shell.dart

@@ -3,6 +3,8 @@ import 'package:flutter/gestures.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:go_router/go_router.dart';
+import 'package:mileograph_flutter/components/pages/calculator.dart';
+import 'package:mileograph_flutter/components/pages/calculator_details.dart';
 import 'package:mileograph_flutter/components/login/login.dart';
 import 'package:mileograph_flutter/components/pages/dashboard.dart';
 import 'package:mileograph_flutter/components/pages/loco_legs.dart';
@@ -19,10 +21,12 @@ import 'package:mileograph_flutter/services/data_service.dart';
 import 'package:mileograph_flutter/services/navigation_guard.dart';
 import 'package:provider/provider.dart';
 
-final GlobalKey<NavigatorState> _shellNavigatorKey = GlobalKey<NavigatorState>();
+final GlobalKey<NavigatorState> _shellNavigatorKey =
+    GlobalKey<NavigatorState>();
 
 const List<String> _contentPages = [
   "/dashboard",
+  "/calculator",
   "/logbook",
   "/traction",
   "/add",
@@ -31,13 +35,14 @@ const List<String> _contentPages = [
 
 const List<String> _defaultTabDestinations = [
   "/dashboard",
+  "/calculator",
   "/logbook/entries",
   "/traction",
   "/add",
   "/more",
 ];
 
-const int _addTabIndex = 3;
+const int _addTabIndex = 4;
 
 class _NavItem {
   final String label;
@@ -47,6 +52,7 @@ class _NavItem {
 
 const List<_NavItem> _navItems = [
   _NavItem("Home", Icons.home),
+  _NavItem("Calculator", Icons.route),
   _NavItem("Logbook", Icons.menu_book),
   _NavItem("Traction", Icons.train),
   _NavItem("Add", Icons.add),
@@ -112,10 +118,7 @@ class _MyAppState extends State<MyApp> {
         return null;
       },
       routes: [
-        GoRoute(
-          path: '/',
-          redirect: (context, state) => '/dashboard',
-        ),
+        GoRoute(path: '/', redirect: (context, state) => '/dashboard'),
         ShellRoute(
           navigatorKey: _shellNavigatorKey,
           builder: (context, state, child) => MyHomePage(child: child),
@@ -124,6 +127,17 @@ class _MyAppState extends State<MyApp> {
               path: '/dashboard',
               builder: (context, state) => const Dashboard(),
             ),
+            GoRoute(
+              path: '/calculator',
+              builder: (context, state) => const CalculatorPage(),
+              routes: [
+                GoRoute(
+                  path: 'details',
+                  builder: (context, state) =>
+                      CalculatorDetailsPage(result: state.extra),
+                ),
+              ],
+            ),
             GoRoute(
               path: '/logbook',
               redirect: (context, state) => '/logbook/entries',
@@ -212,7 +226,10 @@ class _MyAppState extends State<MyApp> {
             ),
           ],
         ),
-        GoRoute(path: '/login', builder: (context, state) => const LoginScreen()),
+        GoRoute(
+          path: '/login',
+          builder: (context, state) => const LoginScreen(),
+        ),
         GoRoute(
           path: '/settings',
           builder: (context, state) => const SettingsPage(),
@@ -373,7 +390,10 @@ class _MyHomePageState extends State<MyHomePage> {
               TextSpan(
                 children: const [
                   TextSpan(text: "Mile"),
-                  TextSpan(text: "O", style: TextStyle(color: Colors.red)),
+                  TextSpan(
+                    text: "O",
+                    style: TextStyle(color: Colors.red),
+                  ),
                   TextSpan(text: "graph"),
                 ],
                 style: const TextStyle(
@@ -390,7 +410,10 @@ class _MyHomePageState extends State<MyHomePage> {
                 onPressed: () => context.go('/more/settings'),
                 icon: const Icon(Icons.settings),
               ),
-              IconButton(onPressed: auth.logout, icon: const Icon(Icons.logout)),
+              IconButton(
+                onPressed: auth.logout,
+                icon: const Icon(Icons.logout),
+              ),
             ],
           ),
           bottomNavigationBar: isWide
@@ -448,7 +471,8 @@ class _MyHomePageState extends State<MyHomePage> {
     return Shortcuts(
       shortcuts: <LogicalKeySet, Intent>{
         LogicalKeySet(LogicalKeyboardKey.browserBack): const _BackIntent(),
-        LogicalKeySet(LogicalKeyboardKey.browserForward): const _ForwardIntent(),
+        LogicalKeySet(LogicalKeyboardKey.browserForward):
+            const _ForwardIntent(),
       },
       child: Actions(
         actions: {
@@ -474,7 +498,10 @@ class _MyHomePageState extends State<MyHomePage> {
               canPop: false,
               onPopInvokedWithResult: (didPop, _) async {
                 if (didPop) return;
-                await _handleBackNavigation(allowExit: true, recordForward: false);
+                await _handleBackNavigation(
+                  allowExit: true,
+                  recordForward: false,
+                );
               },
               child: scaffold,
             ),
@@ -494,7 +521,9 @@ class _MyHomePageState extends State<MyHomePage> {
   }
 
   Widget _buildRailToggleButton(bool railExtended) {
-    final collapseIcon = railExtended ? Icons.chevron_left : Icons.chevron_right;
+    final collapseIcon = railExtended
+        ? Icons.chevron_left
+        : Icons.chevron_right;
     final collapseLabel = railExtended ? 'Collapse' : 'Expand';
 
     if (railExtended) {
@@ -587,8 +616,9 @@ class _MyHomePageState extends State<MyHomePage> {
     final data = context.watch<DataService>();
     final notifications = data.notifications;
     final loading = data.isNotificationsLoading;
-    final listHeight =
-        isWide ? 380.0 : MediaQuery.of(context).size.height * 0.6;
+    final listHeight = isWide
+        ? 380.0
+        : MediaQuery.of(context).size.height * 0.6;
 
     Widget body;
     if (loading && notifications.isEmpty) {
@@ -628,9 +658,7 @@ class _MyHomePageState extends State<MyHomePage> {
                                 item.title.isNotEmpty
                                     ? item.title
                                     : 'Notification',
-                                style: Theme.of(context)
-                                    .textTheme
-                                    .titleMedium
+                                style: Theme.of(context).textTheme.titleMedium
                                     ?.copyWith(fontWeight: FontWeight.w700),
                               ),
                               const SizedBox(height: 4),
@@ -642,18 +670,15 @@ class _MyHomePageState extends State<MyHomePage> {
                                 const SizedBox(height: 6),
                                 Text(
                                   _formatNotificationTime(item.createdAt!),
-                                  style: Theme.of(context)
-                                      .textTheme
-                                      .bodySmall
+                                  style: Theme.of(context).textTheme.bodySmall
                                       ?.copyWith(
                                         color: () {
-                                          final baseColor = Theme.of(context)
-                                              .textTheme
-                                              .bodySmall
-                                              ?.color;
+                                          final baseColor = Theme.of(
+                                            context,
+                                          ).textTheme.bodySmall?.color;
                                           if (baseColor == null) return null;
-                                          final newAlpha =
-                                              (baseColor.a * 0.7).clamp(0.0, 1.0);
+                                          final newAlpha = (baseColor.a * 0.7)
+                                              .clamp(0.0, 1.0);
                                           return baseColor.withValues(
                                             alpha: newAlpha,
                                           );
@@ -666,10 +691,8 @@ class _MyHomePageState extends State<MyHomePage> {
                         ),
                         const SizedBox(width: 8),
                         TextButton(
-                          onPressed: () => _dismissNotifications(
-                            context,
-                            [item.id],
-                          ),
+                          onPressed: () =>
+                              _dismissNotifications(context, [item.id]),
                           child: const Text('Dismiss'),
                         ),
                       ],
@@ -695,19 +718,18 @@ class _MyHomePageState extends State<MyHomePage> {
               children: [
                 Text(
                   'Notifications',
-                  style: Theme.of(context)
-                      .textTheme
-                      .titleLarge
-                      ?.copyWith(fontWeight: FontWeight.bold),
+                  style: Theme.of(
+                    context,
+                  ).textTheme.titleLarge?.copyWith(fontWeight: FontWeight.bold),
                 ),
                 const Spacer(),
                 TextButton(
                   onPressed: notifications.isEmpty
                       ? null
                       : () => _dismissNotifications(
-                            context,
-                            notifications.map((e) => e.id).toList(),
-                          ),
+                          context,
+                          notifications.map((e) => e.id).toList(),
+                        ),
                   child: const Text('Dismiss all'),
                 ),
               ],
@@ -729,9 +751,7 @@ class _MyHomePageState extends State<MyHomePage> {
     try {
       await context.read<DataService>().dismissNotifications(ids);
     } catch (e) {
-      messenger?.showSnackBar(
-        SnackBar(content: Text('Failed to dismiss: $e')),
-      );
+      messenger?.showSnackBar(SnackBar(content: Text('Failed to dismiss: $e')));
     }
   }
 
@@ -751,9 +771,7 @@ class _MyHomePageState extends State<MyHomePage> {
         color: Colors.redAccent,
         borderRadius: BorderRadius.circular(10),
       ),
-      constraints: const BoxConstraints(
-        minWidth: 20,
-      ),
+      constraints: const BoxConstraints(minWidth: 20),
       child: Text(
         label,
         style: const TextStyle(