Improve entries page and latest changes panel, units on events and timeline

lib/components/calculator/route_summary_widget.dart

@@ -36,16 +36,20 @@ class RouteDetailsView extends StatelessWidget {
   final List<String> route;
   final List<double> costs;
   final VoidCallback onBack;
+  final Set<String> routingPoints;
 
   const RouteDetailsView({
     super.key,
     required this.route,
     required this.costs,
     required this.onBack,
+    this.routingPoints = const {},
   });
 
   @override
   Widget build(BuildContext context) {
+    final highlightColor = Theme.of(context).colorScheme.primary;
+    final mutedColor = Theme.of(context).colorScheme.outlineVariant;
     return Column(
       children: [
         Align(
@@ -60,8 +64,20 @@ class RouteDetailsView extends StatelessWidget {
           child: ListView.builder(
             itemCount: route.length,
             itemBuilder: (context, index) {
+              final label = route[index];
+              final isRoutingPoint = routingPoints.contains(label);
               return ListTile(
-                title: Text(route[index]),
+                leading: Icon(
+                  Icons.circle,
+                  size: 12,
+                  color: isRoutingPoint ? highlightColor : mutedColor,
+                ),
+                title: Text(
+                  label,
+                  style: isRoutingPoint
+                      ? TextStyle(color: highlightColor, fontWeight: FontWeight.w600)
+                      : null,
+                ),
                 trailing: Text("${costs[index].toStringAsFixed(2)} mi"),
               );
             },

lib/components/dashboard/latest_loco_changes_panel.dart

@@ -1,9 +1,13 @@
 import 'package:flutter/material.dart';
+import 'package:intl/intl.dart';
+import 'package:mileograph_flutter/objects/objects.dart';
 import 'package:mileograph_flutter/services/data_service.dart';
 import 'package:provider/provider.dart';
 
 class LatestLocoChangesPanel extends StatefulWidget {
-  const LatestLocoChangesPanel({super.key});
+  const LatestLocoChangesPanel({super.key, this.expanded = false});
+
+  final bool expanded;
 
   @override
   State<LatestLocoChangesPanel> createState() => _LatestLocoChangesPanelState();
@@ -11,6 +15,9 @@ class LatestLocoChangesPanel extends StatefulWidget {
 
 class _LatestLocoChangesPanelState extends State<LatestLocoChangesPanel> {
   late final ScrollController _controller;
+  final Set<String> _collapsedDates = {};
+  final Set<String> _collapsedClasses = {};
+  final Set<String> _collapsedLocos = {};
 
   @override
   void initState() {
@@ -29,17 +36,18 @@ class _LatestLocoChangesPanelState extends State<LatestLocoChangesPanel> {
     final data = context.watch<DataService>();
     final changes = data.latestLocoChanges;
     final isLoading = data.isLatestLocoChangesLoading;
+    final hasMore = data.latestLocoChangesHasMore;
     final textTheme = Theme.of(context).textTheme;
 
     return Card(
       clipBehavior: Clip.antiAlias,
       child: Padding(
         padding: const EdgeInsets.all(16),
-        child: Column(
-          crossAxisAlignment: CrossAxisAlignment.stretch,
-          children: [
-            Row(
-              children: [
+          child: Column(
+            crossAxisAlignment: CrossAxisAlignment.stretch,
+            children: [
+              Row(
+                children: [
                 const Icon(Icons.bolt, size: 20),
                 const SizedBox(width: 8),
                 Expanded(
@@ -73,52 +81,419 @@ class _LatestLocoChangesPanelState extends State<LatestLocoChangesPanel> {
                 ),
               )
             else
-              SizedBox(
-                height: 260,
-                child: Scrollbar(
-                  controller: _controller,
-                  child: ListView.separated(
-                    controller: _controller,
-                    itemCount: changes.length,
-                    separatorBuilder: (context, index) =>
-                        const Divider(height: 1),
-                    itemBuilder: (context, index) {
-                      final change = changes[index];
-                      return ListTile(
-                        dense: true,
-                        contentPadding: EdgeInsets.zero,
-                        title: Text(
-                          change.locoLabel,
-                          style: textTheme.titleSmall?.copyWith(
-                            fontWeight: FontWeight.w600,
-                          ),
-                        ),
-                        subtitle: Column(
-                          crossAxisAlignment: CrossAxisAlignment.start,
-                          children: [
-                            Text('${change.changeLabel}: ${change.valueLabel}'),
-                            Text(
-                              change.approvedDateLabel,
-                              style: textTheme.labelSmall?.copyWith(
-                                color: textTheme.bodySmall?.color?.withValues(alpha: 0.7),
-                              ),
-                            ),
-                          ],
-                        ),
-                        trailing: change.approvedBy.isEmpty
-                            ? null
-                            : Text(
-                                change.approvedBy,
-                                style: textTheme.labelSmall,
-                              ),
-                      );
-                    },
+              Column(
+                crossAxisAlignment: CrossAxisAlignment.stretch,
+                children: [
+                  _buildChangesList(changes, textTheme),
+                  const SizedBox(height: 8),
+                  Align(
+                    alignment: Alignment.centerLeft,
+                    child: OutlinedButton.icon(
+                      onPressed: isLoading ? null : _loadMore,
+                      icon: isLoading
+                          ? const SizedBox(
+                              height: 14,
+                              width: 14,
+                              child: CircularProgressIndicator(strokeWidth: 2),
+                            )
+                          : const Icon(Icons.expand_more),
+                      label: Text(isLoading ? 'Loading...' : 'Show more'),
+                    ),
                   ),
-                ),
+                ],
               ),
           ],
         ),
       ),
     );
   }
+
+  Widget _buildChangesList(List<LocoChange> changes, TextTheme textTheme) {
+    final grouped = _groupChanges(changes);
+    // Start with all locos collapsed by default.
+    if (_collapsedLocos.isEmpty) {
+      for (final group in grouped) {
+        for (final classGroup in group.classGroups) {
+          for (final locoGroup in classGroup.locoGroups) {
+            _collapsedLocos.add(
+              _locoKey(group.dateLabel, classGroup.classLabel, locoGroup.locoLabel),
+            );
+          }
+        }
+      }
+    }
+
+    final listView = ListView.separated(
+      controller: null,
+      shrinkWrap: true,
+      physics: const NeverScrollableScrollPhysics(),
+      itemBuilder: (context, groupIndex) {
+        final group = grouped[groupIndex];
+        final dateCollapsed = _collapsedDates.contains(group.dateLabel);
+        return Column(
+          crossAxisAlignment: CrossAxisAlignment.stretch,
+          children: [
+            Padding(
+              padding: const EdgeInsets.symmetric(vertical: 6.0),
+              child: Row(
+                children: [
+                  IconButton(
+                    iconSize: 18,
+                    padding: EdgeInsets.zero,
+                    constraints: const BoxConstraints(),
+                    onPressed: () => _toggleDate(group.dateLabel),
+                    icon: Icon(
+                      dateCollapsed ? Icons.chevron_right : Icons.expand_more,
+                    ),
+                  ),
+                  const SizedBox(width: 6),
+                  Expanded(
+                    child: Text(
+                      group.dateLabel,
+                      style: textTheme.labelLarge?.copyWith(
+                        fontWeight: FontWeight.w700,
+                      ),
+                    ),
+                  ),
+                  TextButton(
+                    onPressed: () => _collapseDateChildren(
+                      group.dateLabel,
+                      group.classGroups,
+                      collapse: !_isDateFullyCollapsed(group),
+                    ),
+                    child: Text(
+                      _isDateFullyCollapsed(group) ? 'Expand all' : 'Collapse all',
+                    ),
+                  ),
+                ],
+              ),
+            ),
+            if (!dateCollapsed)
+              ...group.classGroups.map(
+                (classGroup) {
+                  final classKey = _classKey(group.dateLabel, classGroup.classLabel);
+                  final classCollapsed = _collapsedClasses.contains(classKey);
+                  return Padding(
+                    padding: const EdgeInsets.only(bottom: 8.0, left: 12.0),
+                    child: Column(
+                      crossAxisAlignment: CrossAxisAlignment.start,
+                      children: [
+                        Row(
+                          children: [
+                            IconButton(
+                              iconSize: 18,
+                              padding: EdgeInsets.zero,
+                              constraints: const BoxConstraints(),
+                              onPressed: () => _toggleClass(classKey),
+                              icon: Icon(
+                                classCollapsed
+                                    ? Icons.chevron_right
+                                    : Icons.expand_more,
+                              ),
+                            ),
+                            const SizedBox(width: 4),
+                            Expanded(
+                              child: Text(
+                                classGroup.classLabel,
+                                style: textTheme.titleSmall?.copyWith(
+                                  fontWeight: FontWeight.w700,
+                                ),
+                              ),
+                            ),
+                            TextButton(
+                              onPressed: () => _collapseClassChildren(
+                                group.dateLabel,
+                                classGroup.classLabel,
+                                classGroup.locoGroups,
+                                collapse:
+                                    !_isClassFullyCollapsed(classKey, classGroup, group.dateLabel),
+                              ),
+                              child: Text(
+                                _isClassFullyCollapsed(classKey, classGroup, group.dateLabel)
+                                    ? 'Expand all'
+                                    : 'Collapse all',
+                              ),
+                            ),
+                          ],
+                        ),
+                        if (!classCollapsed)
+                          ...classGroup.locoGroups.map(
+                            (locoGroup) {
+                              final locoKey =
+                                  _locoKey(group.dateLabel, classGroup.classLabel, locoGroup.locoLabel);
+                              final locoCollapsed = _collapsedLocos.contains(locoKey);
+                              return Padding(
+                                padding:
+                                    const EdgeInsets.only(bottom: 4.0, left: 22.0),
+                                child: Column(
+                                  crossAxisAlignment: CrossAxisAlignment.start,
+                                  children: [
+                                    Row(
+                                      children: [
+                                        IconButton(
+                                          iconSize: 18,
+                                          padding: EdgeInsets.zero,
+                                          constraints: const BoxConstraints(),
+                                          onPressed: () => _toggleLoco(locoKey),
+                                          icon: Icon(
+                                            locoCollapsed
+                                                ? Icons.chevron_right
+                                                : Icons.expand_more,
+                                          ),
+                                        ),
+                                        const SizedBox(width: 4),
+                                        Text(
+                                          locoGroup.locoLabel,
+                                          style: textTheme.bodyMedium?.copyWith(
+                                            fontWeight: FontWeight.w700,
+                                          ),
+                                        ),
+                                      ],
+                                    ),
+                                    if (!locoCollapsed) ...[
+                                      const SizedBox(height: 2),
+                                      ...locoGroup.changes.map(
+                                        (change) => ListTile(
+                                          dense: true,
+                                          visualDensity: const VisualDensity(
+                                            horizontal: 0,
+                                            vertical: -3,
+                                          ),
+                                          minVerticalPadding: 0,
+                                          contentPadding: EdgeInsets.zero,
+                                          title: Text(
+                                            '${change.changeLabel}: ${change.valueLabel}',
+                                            style: textTheme.bodyMedium,
+                                          ),
+                                          trailing: change.approvedBy.isEmpty
+                                              ? null
+                                              : Text(
+                                                  change.approvedBy,
+                                                  style: textTheme.labelSmall,
+                                                ),
+                                        ),
+                                      ),
+                                    ],
+                                  ],
+                                ),
+                              );
+                            },
+                          ),
+                      ],
+                    ),
+                  );
+                },
+              ),
+          ],
+        );
+      },
+      separatorBuilder: (_, __) => const Divider(height: 8),
+      itemCount: grouped.length,
+    );
+
+    if (widget.expanded) {
+      return listView;
+    }
+
+    return listView;
+  }
+
+  void _toggleDate(String date) {
+    setState(() {
+      if (_collapsedDates.contains(date)) {
+        _collapsedDates.remove(date);
+      } else {
+        _collapsedDates.add(date);
+      }
+    });
+  }
+
+  void _toggleClass(String key) {
+    setState(() {
+      if (_collapsedClasses.contains(key)) {
+        _collapsedClasses.remove(key);
+      } else {
+        _collapsedClasses.add(key);
+      }
+    });
+  }
+
+  void _toggleLoco(String key) {
+    setState(() {
+      if (_collapsedLocos.contains(key)) {
+        _collapsedLocos.remove(key);
+      } else {
+        _collapsedLocos.add(key);
+      }
+    });
+  }
+
+  void _collapseDateChildren(
+    String date,
+    List<_ClassGroup> classGroups, {
+    required bool collapse,
+  }) {
+    setState(() {
+      for (final classGroup in classGroups) {
+        final classKey = _classKey(date, classGroup.classLabel);
+        if (collapse) {
+          _collapsedClasses.add(classKey);
+        } else {
+          _collapsedClasses.remove(classKey);
+        }
+        for (final locoGroup in classGroup.locoGroups) {
+          final locoKey = _locoKey(date, classGroup.classLabel, locoGroup.locoLabel);
+          if (collapse) {
+            _collapsedLocos.add(locoKey);
+          } else {
+            _collapsedLocos.remove(locoKey);
+          }
+        }
+      }
+    });
+  }
+
+  void _collapseClassChildren(
+    String date,
+    String classLabel,
+    List<_LocoGroup> locos, {
+    required bool collapse,
+  }) {
+    setState(() {
+      final classKey = _classKey(date, classLabel);
+      if (collapse) {
+        _collapsedClasses.add(classKey);
+      } else {
+        _collapsedClasses.remove(classKey);
+      }
+      for (final locoGroup in locos) {
+        final locoKey = _locoKey(date, classLabel, locoGroup.locoLabel);
+        if (collapse) {
+          _collapsedLocos.add(locoKey);
+        } else {
+          _collapsedLocos.remove(locoKey);
+        }
+      }
+    });
+  }
+
+  bool _isDateFullyCollapsed(_ChangeGroup group) {
+    for (final classGroup in group.classGroups) {
+      final classKey = _classKey(group.dateLabel, classGroup.classLabel);
+      if (!_collapsedClasses.contains(classKey)) return false;
+      for (final loco in classGroup.locoGroups) {
+        final locoKey = _locoKey(group.dateLabel, classGroup.classLabel, loco.locoLabel);
+        if (!_collapsedLocos.contains(locoKey)) return false;
+      }
+    }
+    return true;
+  }
+
+  bool _isClassFullyCollapsed(String classKey, _ClassGroup classGroup, String date) {
+    if (!_collapsedClasses.contains(classKey)) return false;
+    for (final loco in classGroup.locoGroups) {
+      final locoKey = _locoKey(date, classGroup.classLabel, loco.locoLabel);
+      if (!_collapsedLocos.contains(locoKey)) return false;
+    }
+    return true;
+  }
+
+  String _classKey(String date, String classLabel) => '$date|$classLabel';
+  String _locoKey(String date, String classLabel, String locoLabel) =>
+      '$date|$classLabel|$locoLabel';
+
+  List<_ChangeGroup> _groupChanges(List<LocoChange> changes) {
+    final dateFormat = DateFormat('yyyy-MM-dd');
+    final Map<String, Map<String, Map<String, List<LocoChange>>>> grouped = {};
+
+    final filtered = changes.where((change) {
+      final code = change.attrCode.toLowerCase();
+      return code != 'build_prec' && code != 'operational' && code != 'gettable';
+    });
+
+    for (final change in filtered) {
+      final date = change.approvedAt ?? change.validFrom;
+      final dateKey = date != null ? dateFormat.format(date) : 'Unknown date';
+      final classKey = change.locoClass.isNotEmpty
+          ? change.locoClass
+          : 'Unknown class';
+      final locoKey = _locoLabel(change);
+      grouped.putIfAbsent(dateKey, () => {});
+      grouped[dateKey]!.putIfAbsent(classKey, () => {});
+      grouped[dateKey]![classKey]!.putIfAbsent(locoKey, () => []);
+      grouped[dateKey]![classKey]![locoKey]!.add(change);
+    }
+
+    final sortedDates = grouped.keys.toList()
+      ..sort((a, b) {
+        if (a == 'Unknown date') return 1;
+        if (b == 'Unknown date') return -1;
+        return b.compareTo(a); // newest first
+      });
+
+    return sortedDates
+        .map(
+          (dateKey) => _ChangeGroup(
+            dateLabel: dateKey,
+            classGroups: grouped[dateKey]!.entries
+                .map(
+                  (classEntry) => _ClassGroup(
+                    classLabel: classEntry.key,
+                    locoGroups: classEntry.value.entries
+                        .map(
+                          (locoEntry) => _LocoGroup(
+                            locoLabel: locoEntry.key,
+                            changes: locoEntry.value
+                              ..sort(
+                                (a, b) => (b.approvedAt ?? b.validFrom ?? DateTime(0))
+                                    .compareTo(a.approvedAt ?? a.validFrom ?? DateTime(0)),
+                              ),
+                          ),
+                        )
+                        .toList(),
+                  ),
+                )
+                .toList(),
+          ),
+        )
+        .toList();
+  }
+
+  Future<void> _loadMore() async {
+    final data = context.read<DataService>();
+    await data.fetchLatestLocoChanges(
+      offset: data.latestLocoChanges.length,
+      append: true,
+    );
+  }
+}
+
+class _ChangeGroup {
+  final String dateLabel;
+  final List<_ClassGroup> classGroups;
+
+  _ChangeGroup({required this.dateLabel, required this.classGroups});
+}
+
+class _LocoGroup {
+  final String locoLabel;
+  final List<LocoChange> changes;
+
+  _LocoGroup({required this.locoLabel, required this.changes});
+}
+
+class _ClassGroup {
+  final String classLabel;
+  final List<_LocoGroup> locoGroups;
+
+  _ClassGroup({required this.classLabel, required this.locoGroups});
+}
+
+String _locoLabel(LocoChange change) {
+  final number = change.locoNumber.trim();
+  final name = change.locoName.trim();
+  if (number.isNotEmpty && name.isNotEmpty) return '$number — $name';
+  if (number.isNotEmpty) return number;
+  if (name.isNotEmpty) return name;
+  return 'Loco ${change.locoId}';
 }

lib/components/legs/leg_card.dart

@@ -3,8 +3,10 @@ import 'dart:convert';
 import 'package:flutter/material.dart';
 import 'package:go_router/go_router.dart';
 import 'package:mileograph_flutter/objects/objects.dart';
+import 'package:mileograph_flutter/services/data_service.dart';
+import 'package:provider/provider.dart';
 
-class LegCard extends StatelessWidget {
+class LegCard extends StatefulWidget {
   const LegCard({
     super.key,
     required this.leg,
@@ -16,30 +18,106 @@ class LegCard extends StatelessWidget {
   final bool showEditButton;
   final bool showDate;
 
+  @override
+  State<LegCard> createState() => _LegCardState();
+}
+
+class _LegCardState extends State<LegCard> {
+  bool _expanded = false;
+
   @override
   Widget build(BuildContext context) {
+    final leg = widget.leg;
     final routeSegments = _parseRouteSegments(leg.route);
     final textTheme = Theme.of(context).textTheme;
     return Card(
       child: ExpansionTile(
+        onExpansionChanged: (v) => setState(() => _expanded = v),
         tilePadding: const EdgeInsets.symmetric(horizontal: 12, vertical: 4),
         leading: const Icon(Icons.train),
-        title: Text('${leg.start} → ${leg.end}'),
-        subtitle: Column(
-          crossAxisAlignment: CrossAxisAlignment.start,
-          children: [
-            if (showDate) Text(_formatDateTime(leg.beginTime)),
-            if (leg.headcode.isNotEmpty)
-              Text(
-                'Headcode: ${leg.headcode}',
-                style: textTheme.labelSmall,
-              ),
-            if (leg.network.isNotEmpty)
-              Text(
-                leg.network,
-                style: textTheme.labelSmall,
-              ),
-          ],
+        title: LayoutBuilder(
+          builder: (context, constraints) {
+            final isWide = constraints.maxWidth > 520;
+            final routeText = Text('${leg.start} → ${leg.end}');
+            final timeText =
+                Text(_formatDateTime(leg.beginTime, includeDate: widget.showDate));
+            if (!isWide) {
+              return routeText;
+            }
+            return Row(
+              children: [
+                timeText,
+                const SizedBox(width: 6),
+                const Text('·'),
+                const SizedBox(width: 6),
+                Expanded(child: routeText),
+              ],
+            );
+          },
+        ),
+        subtitle: LayoutBuilder(
+          builder: (context, constraints) {
+            final isWide = constraints.maxWidth > 520;
+            final timeWidget =
+                Text(_formatDateTime(leg.beginTime, includeDate: widget.showDate));
+            final tractionWrap = !_expanded && leg.locos.isNotEmpty
+                ? Wrap(
+                    spacing: 8,
+                    runSpacing: 4,
+                    children: leg.locos.map((loco) {
+                      final iconColor = loco.powering
+                          ? Theme.of(context).colorScheme.primary
+                          : Theme.of(context).hintColor;
+                      final label = '${loco.locoClass} ${loco.number}'.trim();
+                      return Row(
+                        mainAxisSize: MainAxisSize.min,
+                        children: [
+                          Icon(Icons.train, size: 14, color: iconColor),
+                          const SizedBox(width: 4),
+                          Text(
+                            label.isEmpty ? 'Loco ${loco.id}' : label,
+                            style: textTheme.labelSmall,
+                          ),
+                        ],
+                      );
+                    }).toList(),
+                  )
+                : null;
+
+            final children = <Widget>[];
+            if (isWide) {
+              if (tractionWrap != null) {
+                children.add(tractionWrap);
+              }
+            } else {
+              children.add(timeWidget);
+              if (tractionWrap != null) {
+                children.add(const SizedBox(height: 4));
+                children.add(tractionWrap);
+              }
+            }
+            if (leg.headcode.isNotEmpty) {
+              children.add(
+                Text(
+                  'Headcode: ${leg.headcode}',
+                  style: textTheme.labelSmall,
+                ),
+              );
+            }
+            if (leg.network.isNotEmpty) {
+              children.add(
+                Text(
+                  leg.network,
+                  style: textTheme.labelSmall,
+                ),
+              );
+            }
+
+            return Column(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: children,
+            );
+          },
         ),
         trailing: Row(
           mainAxisSize: MainAxisSize.min,
@@ -66,7 +144,7 @@ class LegCard extends StatelessWidget {
                 ],
               ],
             ),
-            if (showEditButton) ...[
+            if (widget.showEditButton) ...[
               const SizedBox(width: 8),
               IconButton(
                 tooltip: 'Edit entry',
@@ -76,6 +154,18 @@ class LegCard extends StatelessWidget {
                 constraints: const BoxConstraints(minWidth: 32, minHeight: 32),
                 onPressed: () => context.push('/legs/edit/${leg.id}'),
               ),
+              if (_expanded) ...[
+                const SizedBox(width: 4),
+                IconButton(
+                  tooltip: 'Delete entry',
+                  icon: const Icon(Icons.delete_outline),
+                  color: Theme.of(context).colorScheme.error,
+                  visualDensity: VisualDensity.compact,
+                  padding: EdgeInsets.zero,
+                  constraints: const BoxConstraints(minWidth: 32, minHeight: 32),
+                  onPressed: () => _confirmDelete(context, leg.id),
+                ),
+              ],
             ],
           ],
         ),
@@ -114,15 +204,52 @@ class LegCard extends StatelessWidget {
     );
   }
 
+  Future<void> _confirmDelete(BuildContext context, int legId) async {
+    final confirmed = await showDialog<bool>(
+      context: context,
+      builder: (ctx) => AlertDialog(
+        title: const Text('Delete entry?'),
+        content: const Text('Are you sure you want to delete this entry?'),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.of(ctx).pop(false),
+            child: const Text('Cancel'),
+          ),
+          FilledButton(
+            onPressed: () => Navigator.of(ctx).pop(true),
+            child: const Text('Delete'),
+          ),
+        ],
+      ),
+    );
+    if (confirmed != true) return;
+
+    final data = context.read<DataService>();
+    final messenger = ScaffoldMessenger.of(context);
+    try {
+      await data.api.delete('/legs/delete?leg_id=$legId');
+      await data.refreshLegs();
+      messenger.showSnackBar(const SnackBar(content: Text('Entry deleted')));
+    } catch (e) {
+      messenger.showSnackBar(
+        SnackBar(content: Text('Failed to delete entry: $e')),
+      );
+    }
+  }
+
   String _formatDate(DateTime? date) {
     if (date == null) return '';
     return '${date.year.toString().padLeft(4, '0')}-${date.month.toString().padLeft(2, '0')}-${date.day.toString().padLeft(2, '0')}';
   }
 
-  String _formatDateTime(DateTime date) {
+  String _formatTime(DateTime date) {
+    return '${date.hour.toString().padLeft(2, '0')}:${date.minute.toString().padLeft(2, '0')}';
+  }
+
+  String _formatDateTime(DateTime date, {bool includeDate = true}) {
+    final timeStr = _formatTime(date);
+    if (!includeDate) return timeStr;
     final dateStr = _formatDate(date);
-    final timeStr =
-        '${date.hour.toString().padLeft(2, '0')}:${date.minute.toString().padLeft(2, '0')}';
     return '$dateStr · $timeStr';
   }
 

lib/components/pages/calculator_details.dart

@@ -39,9 +39,9 @@ class CalculatorDetailsPage extends StatelessWidget {
       child: RouteDetailsView(
         route: parsed.calculatedRoute,
         costs: parsed.costs,
+        routingPoints: parsed.inputRoute.toSet(),
         onBack: () => context.pop(),
       ),
     );
   }
 }
-

lib/components/pages/dashboard.dart

@@ -232,6 +232,8 @@ class _DashboardState extends State<Dashboard> {
                 _buildOnThisDayCard(context, data),
                 const SizedBox(height: 16),
                 _buildTripsCard(context, data),
+                const SizedBox(height: 16),
+                const LatestLocoChangesPanel(expanded: true),
               ],
             ),
           ),
@@ -244,8 +246,6 @@ class _DashboardState extends State<Dashboard> {
                 TopTractionPanel(),
                 SizedBox(height: 16),
                 LeaderboardPanel(),
-                SizedBox(height: 16),
-                LatestLocoChangesPanel(),
               ],
             ),
           ),

lib/components/pages/loco_timeline.dart

@@ -36,6 +36,21 @@ class _LocoTimelinePageState extends State<LocoTimelinePage> {
     WidgetsBinding.instance.addPostFrameCallback((_) => _load());
   }
 
+  dynamic _normalizeFieldValue(_FieldEntry field) {
+    final name = field.field.name.toLowerCase();
+    final val = field.value;
+    if (name == 'max_speed') {
+      final numVal = val is num ? val.toDouble() : double.tryParse('$val');
+      if (numVal == null) return val;
+      final unit = (field.unit ?? 'kph').toLowerCase();
+      if (unit == 'mph') {
+        return numVal * 1.60934;
+      }
+      return numVal;
+    }
+    return val;
+  }
+
   @override
   void dispose() {
     _disposeDrafts(_draftEvents);
@@ -57,7 +72,7 @@ class _LocoTimelinePageState extends State<LocoTimelinePage> {
   String? _eventDateForEntry(LocoAttrVersion entry) {
     final masked = entry.maskedValidFrom?.trim();
     if (masked != null && masked.isNotEmpty) return masked;
-    final from = entry.validFrom ?? entry.txnFrom;
+    final from = entry.validFrom;
     if (from == null) return null;
     return DateFormat('yyyy-MM-dd').format(from);
   }
@@ -115,7 +130,8 @@ class _LocoTimelinePageState extends State<LocoTimelinePage> {
     draft.details = '';
     draft.fields.add(
       _FieldEntry(field: field)
-        ..value = _valueForEntry(entry),
+        ..value = _valueForEntry(entry)
+        ..unit = _guessUnit(field, entry.valueLabel),
     );
 
     setState(() {
@@ -123,6 +139,16 @@ class _LocoTimelinePageState extends State<LocoTimelinePage> {
     });
   }
 
+  String? _guessUnit(EventField field, String valueLabel) {
+    final name = field.name.toLowerCase();
+    if (name == 'max_speed') {
+      final val = valueLabel.toLowerCase();
+      if (val.contains('mph')) return 'mph';
+      return 'kph';
+    }
+    return _defaultUnitForField(field);
+  }
+
   Future<void> _deleteEntry(LocoAttrVersion entry) async {
     if (_isDeleting) return;
     final blockId = entry.versionId;
@@ -241,7 +267,7 @@ class _LocoTimelinePageState extends State<LocoTimelinePage> {
             invalid.add('Field ${field.field.display} is empty');
             break;
           }
-          values[field.field.name] = val;
+          values[field.field.name] = _normalizeFieldValue(field);
         }
         if (invalid.isNotEmpty) continue;
         if (values.isEmpty) {

lib/components/pages/loco_timeline/event_editor.dart

@@ -184,7 +184,9 @@ class _FieldList extends StatelessWidget {
               value: null,
               onChanged: (field) {
                 if (field == null) return;
-                draft.fields.add(_FieldEntry(field: field));
+                draft.fields.add(
+                  _FieldEntry(field: field)..unit = _defaultUnitForField(field),
+                );
                 onChange();
               },
               items: availableFields
@@ -224,10 +226,10 @@ class _FieldList extends StatelessWidget {
                           ),
                           const SizedBox(height: 4),
                           _FieldInput(
-                            field: field.field,
-                            value: field.value,
-                            onChanged: (val) {
+                            entry: field,
+                            onChanged: (val, {String? unit}) {
                               field.value = val;
+                              if (unit != null) field.unit = unit;
                               onChange();
                             },
                           ),
@@ -253,17 +255,18 @@ class _FieldList extends StatelessWidget {
 
 class _FieldInput extends StatelessWidget {
   const _FieldInput({
-    required this.field,
-    required this.value,
+    required this.entry,
     required this.onChanged,
   });
 
-  final EventField field;
-  final dynamic value;
-  final ValueChanged<dynamic> onChanged;
+  final _FieldEntry entry;
+  final void Function(dynamic value, {String? unit}) onChanged;
 
   @override
   Widget build(BuildContext context) {
+    final field = entry.field;
+    final value = entry.value;
+
     if (field.enumValues != null && field.enumValues!.isNotEmpty) {
       final options = field.enumValues!;
       return DropdownButtonFormField<String>(
@@ -293,6 +296,119 @@ class _FieldInput extends StatelessWidget {
       );
     }
 
+    final name = field.name.toLowerCase();
+    if (name == 'max_speed') {
+      final unit = entry.unit ?? 'kph';
+      final isNumber = true;
+      return Row(
+        children: [
+          Expanded(
+            child: TextFormField(
+              initialValue: value?.toString(),
+              onChanged: (val) {
+                final parsed = double.tryParse(val);
+                onChanged(isNumber ? parsed : val, unit: unit);
+              },
+              decoration: const InputDecoration(
+                border: OutlineInputBorder(),
+                hintText: 'Enter value',
+                suffixText: 'kph/mph',
+              ),
+              keyboardType: TextInputType.number,
+            ),
+          ),
+          const SizedBox(width: 8),
+          SizedBox(
+            width: 88,
+            child: DropdownButtonFormField<String>(
+              value: unit,
+              items: const [
+                DropdownMenuItem(value: 'kph', child: Text('kph')),
+                DropdownMenuItem(value: 'mph', child: Text('mph')),
+              ],
+              onChanged: (val) {
+                if (val == null) return;
+                onChanged(value, unit: val);
+              },
+              decoration: const InputDecoration(
+                border: OutlineInputBorder(),
+                labelText: 'Unit',
+              ),
+            ),
+          ),
+        ],
+      );
+    }
+
+    if ({
+      'height',
+      'length',
+      'width',
+      'track_gauge',
+    }.contains(name)) {
+      return TextFormField(
+        initialValue: value?.toString(),
+        onChanged: (val) {
+          final parsed = double.tryParse(val);
+          onChanged(parsed ?? val);
+        },
+        decoration: const InputDecoration(
+          border: OutlineInputBorder(),
+          hintText: 'Enter value',
+          suffixText: 'mm',
+        ),
+        keyboardType: TextInputType.number,
+      );
+    }
+
+    if (name == 'weight') {
+      return TextFormField(
+        initialValue: value?.toString(),
+        onChanged: (val) {
+          final parsed = double.tryParse(val);
+          onChanged(parsed ?? val);
+        },
+        decoration: const InputDecoration(
+          border: OutlineInputBorder(),
+          hintText: 'Enter value',
+          suffixText: 'tonnes',
+        ),
+        keyboardType: TextInputType.number,
+      );
+    }
+
+    if (name == 'power') {
+      return TextFormField(
+        initialValue: value?.toString(),
+        onChanged: (val) {
+          final parsed = double.tryParse(val);
+          onChanged(parsed ?? val);
+        },
+        decoration: const InputDecoration(
+          border: OutlineInputBorder(),
+          hintText: 'Enter value',
+          suffixText: 'kW',
+        ),
+        keyboardType: TextInputType.number,
+      );
+    }
+
+    if (name == 'tractive_effort') {
+      return TextFormField(
+        initialValue: value?.toString(),
+        onChanged: (val) {
+          final parsed = double.tryParse(val);
+          onChanged(parsed ?? val);
+        },
+        decoration: const InputDecoration(
+          border: OutlineInputBorder(),
+          hintText: 'Enter value',
+          suffixText: 'kN',
+        ),
+        keyboardType: TextInputType.number,
+      );
+    }
+
     final isNumber = type == 'int' || type == 'integer';
     return TextFormField(
       initialValue: value?.toString(),
@@ -326,6 +442,13 @@ class _EventDraft {
 class _FieldEntry {
   final EventField field;
   dynamic value;
+  String? unit;
 
   _FieldEntry({required this.field});
 }
+
+String? _defaultUnitForField(EventField field) {
+  final name = field.name.toLowerCase();
+  if (name == 'max_speed') return 'kph';
+  return null;
+}

lib/components/pages/loco_timeline/timeline_grid.dart

@@ -577,7 +577,7 @@ class _TimelineModel {
           _ValueSegment(
             start: start,
             end: end,
-            value: entry.valueLabel,
+            value: _formatValueWithUnits(entry),
             entry: entry,
           ),
         );
@@ -680,6 +680,53 @@ class _TimelineModel {
   }
 }
 
+String _formatValueWithUnits(LocoAttrVersion entry) {
+  final raw = entry.valueLabel;
+  final code = entry.attrCode.toLowerCase();
+  final lowerRaw = raw.toLowerCase();
+  // Avoid double-appending if units already present.
+  final hasUnits = lowerRaw.contains('mm') ||
+      lowerRaw.contains('tonne') ||
+      lowerRaw.contains('kph') ||
+      lowerRaw.contains('mph');
+
+  double? asNumber = double.tryParse(raw);
+  String formatNumber(double value) {
+    if (value % 1 == 0) return value.toStringAsFixed(0);
+    return value.toStringAsFixed(2);
+  }
+
+  switch (code) {
+    case 'height':
+    case 'length':
+    case 'width':
+    case 'track_gauge':
+      if (hasUnits) return raw;
+      return asNumber != null ? '${formatNumber(asNumber)} mm' : '$raw mm';
+    case 'weight':
+      if (hasUnits) return raw;
+      return asNumber != null ? '${formatNumber(asNumber)} tonnes' : '$raw tonnes';
+    case 'power':
+      if (hasUnits) return raw;
+      return asNumber != null ? '${formatNumber(asNumber)} kW' : '$raw kW';
+    case 'tractive_effort':
+      if (hasUnits) return raw;
+      return asNumber != null ? '${formatNumber(asNumber)} kN' : '$raw kN';
+    case 'max_speed':
+      if (hasUnits) return raw;
+      if (asNumber != null) {
+        // Stored as kph.
+        final formatted = asNumber % 1 == 0
+            ? asNumber.toStringAsFixed(0)
+            : asNumber.toStringAsFixed(1);
+        return '$formatted kph';
+      }
+      return '$raw kph';
+    default:
+      return raw;
+  }
+}
+
 class _AxisSegment {
   final DateTime start;
   final DateTime end;
@@ -742,7 +789,15 @@ class _RowCell {
         color: Colors.transparent,
       );
     }
-    final displayStart = _formatDate(seg.start) ?? '';
+    final entry = seg.entry;
+    String displayStart = '';
+    if (entry != null) {
+      if ((entry.maskedValidFrom ?? '').trim().isNotEmpty) {
+        displayStart = entry.maskedValidFrom!.trim();
+      } else if (entry.validFrom != null) {
+        displayStart = _formatDate(entry.validFrom) ?? '';
+      }
+    }
     return _RowCell(
       value: seg.value,
       rangeLabel: displayStart,

lib/components/pages/new_entry/new_entry_submit_logic.dart

@@ -128,7 +128,9 @@ extension _NewEntrySubmitLogic on _NewEntryPageState {
       );
       _lastSubmittedSnapshot = snapshot;
       _activeDraftId = null;
-    } catch (e) {
+    } catch (e, st) {
+      debugPrint('Leg submit/update failed: $e');
+      debugPrintStack(stackTrace: st);
       if (!mounted) return;
       messenger?.showSnackBar(
         SnackBar(content: Text('Failed to submit: $e')),

lib/components/pages/new_entry/new_entry_traction_logic.dart

@@ -73,6 +73,8 @@ extension _NewEntryTractionLogic on _NewEntryPageState {
     for (var i = 0; i < _tractionItems.length; i++) {
       final item = _tractionItems[i];
       if (item.isMarker || item.loco == null) continue;
+      final locoId = item.loco!.id;
+      if (locoId == 0) continue;
       int allocPos;
       if (i > markerIndex) {
         allocPos = -(i - markerIndex);
@@ -80,8 +82,7 @@ extension _NewEntryTractionLogic on _NewEntryPageState {
         allocPos = (markerIndex - 1) - i;
       }
       payload.add({
-        "loco_type": item.loco!.type,
-        "loco_number": item.loco!.number,
+        "loco_id": locoId,
         "alloc_pos": allocPos,
         "alloc_powering": item.powering ? 1 : 0,
       });

lib/components/pages/traction/traction.dart

@@ -1,3 +1,4 @@
+import 'dart:async';
 import 'dart:convert';
 
 import 'package:flutter/material.dart';

lib/services/data_service/data_service_core.dart

@@ -48,6 +48,9 @@ class DataService extends ChangeNotifier {
   List<LocoChange> get latestLocoChanges => _latestLocoChanges;
   bool _isLatestLocoChangesLoading = false;
   bool get isLatestLocoChangesLoading => _isLatestLocoChangesLoading;
+  bool _latestLocoChangesHasMore = false;
+  bool get latestLocoChangesHasMore => _latestLocoChangesHasMore;
+  int _latestLocoChangesFetched = 0;
   final Map<int, List<LocoAttrVersion>> _locoTimelines = {};
   final Map<int, bool> _isLocoTimelineLoading = {};
   List<LocoAttrVersion> timelineForLoco(int locoId) =>

lib/services/data_service/data_service_traction.dart

@@ -115,7 +115,11 @@ extension DataServiceTraction on DataService {
     return _locoClasses;
   }
 
-  Future<void> fetchLatestLocoChanges({int limit = 25, int offset = 0}) async {
+  Future<void> fetchLatestLocoChanges({
+    int limit = 100,
+    int offset = 0,
+    bool append = false,
+  }) async {
     _isLatestLocoChangesLoading = true;
     _notifyAsync();
     try {
@@ -138,16 +142,41 @@ extension DataServiceTraction on DataService {
             );
           }
         }
-        _latestLocoChanges = parsed;
+        if (append) {
+          _latestLocoChanges = [..._latestLocoChanges, ...parsed];
+        } else {
+          _latestLocoChanges = parsed;
+        }
+        final fetchedCount = parsed.length;
+        _latestLocoChangesFetched = append
+            ? offset + fetchedCount
+            : fetchedCount;
+        _latestLocoChangesHasMore = _latestLocoChangesFetched < 5000;
       } else {
         throw Exception('Unexpected latest loco changes response: $json');
       }
     } catch (e) {
       debugPrint('Failed to fetch latest loco changes: $e');
       _latestLocoChanges = [];
+      _latestLocoChangesHasMore = false;
+      _latestLocoChangesFetched = 0;
     } finally {
       _isLatestLocoChangesLoading = false;
       _notifyAsync();
     }
   }
+
+  Future<Map<String, dynamic>?> fetchClassStats(String locoClass) async {
+    try {
+      final path = Uri.encodeComponent(locoClass);
+      final json = await api.get('/loco/class/stats/$path/user');
+      if (json is Map) {
+        return Map<String, dynamic>.from(json);
+      }
+      debugPrint('Unexpected class stats response for $locoClass: $json');
+    } catch (e) {
+      debugPrint('Failed to fetch class stats for $locoClass: $e');
+    }
+    return null;
+  }
 }

lib/ui/app_shell.dart

@@ -1,4 +1,5 @@
 import 'package:dynamic_color/dynamic_color.dart';
+import 'package:flutter/gestures.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:go_router/go_router.dart';
@@ -189,6 +190,14 @@ class _MyAppState extends State<MyApp> {
   }
 }
 
+class _BackIntent extends Intent {
+  const _BackIntent();
+}
+
+class _ForwardIntent extends Intent {
+  const _ForwardIntent();
+}
+
 class MyHomePage extends StatefulWidget {
   final Widget child;
   const MyHomePage({super.key, required this.child});
@@ -206,13 +215,14 @@ class _MyHomePageState extends State<MyHomePage> {
     }
     await NavigationGuard.attemptNavigation(() async {
       if (!mounted) return;
-      context.go(contentPages[index]);
+      _navigateToIndex(index);
     });
   }
 
-  int? _lastTabIndex;
-  final List<int> _tabHistory = [];
-  bool _handlingBackNavigation = false;
+  final List<int> _history = [];
+  int _historyPosition = -1;
+  final List<int> _forwardHistory = [];
+  bool _suppressRecord = false;
 
   bool _fetched = false;
 
@@ -256,7 +266,7 @@ class _MyHomePageState extends State<MyHomePage> {
   Widget build(BuildContext context) {
     final uri = GoRouterState.of(context).uri;
     final pageIndex = tabIndexForPath(uri.path);
-    _recordTabChange(pageIndex);
+    _syncHistory(pageIndex);
     if (pageIndex != _addTabIndex) {
       NavigationGuard.unregister();
     }
@@ -269,136 +279,227 @@ class _MyHomePageState extends State<MyHomePage> {
         ? widget.child
         : const Center(child: CircularProgressIndicator());
 
-    return PopScope(
-      canPop: false,
-      onPopInvokedWithResult: (didPop, _) async {
-        if (didPop) return;
+    final scaffold = LayoutBuilder(
+      builder: (context, constraints) {
+        final isWide = constraints.maxWidth >= 900;
+        final railExtended = constraints.maxWidth >= 1400;
+        final navRailDestinations = _navItems
+            .map(
+              (item) => NavigationRailDestination(
+                icon: Icon(item.icon),
+                label: Text(item.label),
+              ),
+            )
+            .toList();
+        final navBarDestinations = _navItems
+            .map(
+              (item) => NavigationDestination(
+                icon: Icon(item.icon),
+                label: item.label,
+              ),
+            )
+            .toList();
 
-        final shellNav = _shellNavigatorKey.currentState;
-        if (shellNav != null && shellNav.canPop()) {
-          shellNav.pop();
-          return;
-        }
-
-        if (_tabHistory.isNotEmpty) {
-          final previousTab = _tabHistory.removeLast();
-          if (!mounted) return;
-          _handlingBackNavigation = true;
-          context.go(contentPages[previousTab]);
-          return;
-        }
-
-        if (pageIndex != 0) {
-          if (!mounted) return;
-          _handlingBackNavigation = true;
-          context.go(contentPages[0]);
-          return;
-        }
-
-        SystemNavigator.pop();
-      },
-      child: LayoutBuilder(
-        builder: (context, constraints) {
-          final isWide = constraints.maxWidth >= 900;
-          final railExtended = constraints.maxWidth >= 1400;
-          final navRailDestinations = _navItems
-              .map(
-                (item) => NavigationRailDestination(
-                  icon: Icon(item.icon),
-                  label: Text(item.label),
-                ),
-              )
-              .toList();
-          final navBarDestinations = _navItems
-              .map(
-                (item) => NavigationDestination(
-                  icon: Icon(item.icon),
-                  label: item.label,
-                ),
-              )
-              .toList();
-
-          return Scaffold(
-            appBar: AppBar(
-              backgroundColor: Theme.of(context).colorScheme.inversePrimary,
-              title: Text.rich(
-                TextSpan(
-                  children: const [
-                    TextSpan(text: "Mile"),
-                    TextSpan(text: "O", style: TextStyle(color: Colors.red)),
-                    TextSpan(text: "graph"),
-                  ],
-                  style: const TextStyle(
-                    decoration: TextDecoration.none,
-                    color: Colors.white,
-                    fontFamily: "Tomatoes",
-                  ),
+        return Scaffold(
+          appBar: AppBar(
+            backgroundColor: Theme.of(context).colorScheme.inversePrimary,
+            title: Text.rich(
+              TextSpan(
+                children: const [
+                  TextSpan(text: "Mile"),
+                  TextSpan(text: "O", style: TextStyle(color: Colors.red)),
+                  TextSpan(text: "graph"),
+                ],
+                style: const TextStyle(
+                  decoration: TextDecoration.none,
+                  color: Colors.white,
+                  fontFamily: "Tomatoes",
                 ),
               ),
-              actions: [
-                const IconButton(
-                  onPressed: null,
-                  icon: Icon(Icons.account_circle),
-                ),
-                IconButton(
-                  tooltip: 'Settings',
-                  onPressed: () => context.go('/settings'),
-                  icon: const Icon(Icons.settings),
-                ),
-                IconButton(onPressed: auth.logout, icon: const Icon(Icons.logout)),
-              ],
             ),
-            bottomNavigationBar: isWide
-                ? null
-                : NavigationBar(
-                    selectedIndex: pageIndex,
-                    onDestinationSelected: (int index) =>
-                        _onItemTapped(index, pageIndex),
-                    destinations: navBarDestinations,
-                  ),
-            body: isWide
-                ? Row(
-                    children: [
-                      SafeArea(
-                        child: NavigationRail(
-                          selectedIndex: pageIndex,
-                          extended: railExtended,
-                          labelType: railExtended
-                              ? NavigationRailLabelType.none
-                              : NavigationRailLabelType.selected,
-                          onDestinationSelected: (int index) =>
-                              _onItemTapped(index, pageIndex),
-                          destinations: navRailDestinations,
-                        ),
+            actions: [
+              const IconButton(
+                onPressed: null,
+                icon: Icon(Icons.account_circle),
+              ),
+              IconButton(
+                tooltip: 'Settings',
+                onPressed: () => context.go('/settings'),
+                icon: const Icon(Icons.settings),
+              ),
+              IconButton(onPressed: auth.logout, icon: const Icon(Icons.logout)),
+            ],
+          ),
+          bottomNavigationBar: isWide
+              ? null
+              : NavigationBar(
+                  selectedIndex: pageIndex,
+                  onDestinationSelected: (int index) =>
+                      _onItemTapped(index, pageIndex),
+                  destinations: navBarDestinations,
+                ),
+          body: isWide
+              ? Row(
+                  children: [
+                    SafeArea(
+                      child: NavigationRail(
+                        selectedIndex: pageIndex,
+                        extended: railExtended,
+                        labelType: railExtended
+                            ? NavigationRailLabelType.none
+                            : NavigationRailLabelType.selected,
+                        onDestinationSelected: (int index) =>
+                            _onItemTapped(index, pageIndex),
+                        destinations: navRailDestinations,
                       ),
-                      const VerticalDivider(width: 1),
-                      Expanded(child: currentPage),
-                    ],
-                  )
-                : currentPage,
-          );
+                    ),
+                    const VerticalDivider(width: 1),
+                    Expanded(child: currentPage),
+                  ],
+                )
+              : currentPage,
+        );
+      },
+    );
+
+    return Shortcuts(
+      shortcuts: <LogicalKeySet, Intent>{
+        LogicalKeySet(LogicalKeyboardKey.browserBack): const _BackIntent(),
+        LogicalKeySet(LogicalKeyboardKey.browserForward): const _ForwardIntent(),
+      },
+      child: Actions(
+        actions: {
+          _BackIntent: CallbackAction<_BackIntent>(
+            onInvoke: (_) {
+              _handleBackNavigation(allowExit: false, recordForward: true);
+              return null;
+            },
+          ),
+          _ForwardIntent: CallbackAction<_ForwardIntent>(
+            onInvoke: (_) {
+              _handleForwardNavigation();
+              return null;
+            },
+          ),
         },
+        child: Focus(
+          autofocus: true,
+          child: Listener(
+            onPointerDown: _handlePointerButtons,
+            behavior: HitTestBehavior.opaque,
+            child: PopScope(
+              canPop: false,
+              onPopInvokedWithResult: (didPop, _) async {
+                if (didPop) return;
+                await _handleBackNavigation(allowExit: true, recordForward: false);
+              },
+              child: scaffold,
+            ),
+          ),
+        ),
       ),
     );
   }
 
-  void _recordTabChange(int pageIndex) {
-    final last = _lastTabIndex;
-    if (last == null) {
-      _lastTabIndex = pageIndex;
-      return;
+  void _handlePointerButtons(PointerDownEvent event) {
+    // Support mouse back/forward buttons.
+    if (event.buttons == kBackMouseButton) {
+      _handleBackNavigation(allowExit: false, recordForward: true);
+    } else if (event.buttons == kForwardMouseButton) {
+      _handleForwardNavigation();
     }
-    if (last == pageIndex) return;
+  }
 
-    if (_handlingBackNavigation) {
-      _handlingBackNavigation = false;
-      _lastTabIndex = pageIndex;
-      return;
+  int get _currentPageIndex => tabIndexForPath(GoRouterState.of(context).uri.path);
+
+  Future<bool> _handleBackNavigation({
+    bool allowExit = false,
+    bool recordForward = false,
+  }) async {
+    final pageIndex = _currentPageIndex;
+    final shellNav = _shellNavigatorKey.currentState;
+    if (shellNav != null && shellNav.canPop()) {
+      shellNav.pop();
+      return true;
     }
 
-    if (_tabHistory.isEmpty || _tabHistory.last != last) {
-      _tabHistory.add(last);
+    if (_historyPosition > 0) {
+      if (recordForward) _pushForward(pageIndex);
+      _historyPosition -= 1;
+      _suppressRecord = true;
+      context.go(contentPages[_history[_historyPosition]]);
+      return true;
     }
-    _lastTabIndex = pageIndex;
+
+    if (pageIndex != 0) {
+      if (recordForward) _pushForward(pageIndex);
+      _suppressRecord = true;
+      context.go(contentPages[0]);
+      return true;
+    }
+
+    if (allowExit) {
+      SystemNavigator.pop();
+      return true;
+    }
+
+    return false;
+  }
+
+  Future<bool> _handleForwardNavigation() async {
+    if (_forwardHistory.isEmpty) return false;
+    final nextTab = _forwardHistory.removeLast();
+
+    // Move cursor forward, keeping history in sync.
+    if (_historyPosition < _history.length - 1) {
+      _historyPosition += 1;
+      _history[_historyPosition] = nextTab;
+      if (_historyPosition < _history.length - 1) {
+        _history.removeRange(_historyPosition + 1, _history.length);
+      }
+    } else {
+      _history.add(nextTab);
+      _historyPosition = _history.length - 1;
+    }
+
+    _suppressRecord = true;
+    if (!mounted) return false;
+    context.go(contentPages[nextTab]);
+    return true;
+  }
+
+  void _pushForward(int pageIndex) {
+    if (_forwardHistory.isEmpty || _forwardHistory.last != pageIndex) {
+      _forwardHistory.add(pageIndex);
+    }
+  }
+
+  void _syncHistory(int pageIndex) {
+    if (_history.isEmpty) {
+      _history.add(pageIndex);
+      _historyPosition = 0;
+      return;
+    }
+    if (_suppressRecord) {
+      _suppressRecord = false;
+      return;
+    }
+    if (_historyPosition >= 0 &&
+        _historyPosition < _history.length &&
+        _history[_historyPosition] == pageIndex) {
+      return;
+    }
+    if (_historyPosition < _history.length - 1) {
+      _history.removeRange(_historyPosition + 1, _history.length);
+    }
+    _history.add(pageIndex);
+    _historyPosition = _history.length - 1;
+    _forwardHistory.clear();
+  }
+
+  void _navigateToIndex(int index) {
+    _suppressRecord = false;
+    _forwardHistory.clear();
+    context.go(contentPages[index]);
   }
 }

pubspec.yaml

@@ -16,7 +16,7 @@ publish_to: "none" # Remove this line if you wish to publish to pub.dev
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
 # In Windows, build-name is used as the major, minor, and patch parts
 # of the product and file versions while build-number is used as the build suffix.
-version: 0.3.3+1
+version: 0.3.4+1
 
 environment:
   sdk: ^3.8.1