add filter by network for legs, add full export for traction

lib/components/pages/traction/traction_page.dart

@@ -1,6 +1,7 @@
 part of 'traction.dart';
 
 enum _TractionMoreAction {
+  exportResults,
   classStats,
   classLeaderboard,
   adminPending,
@@ -68,14 +69,14 @@ class _TractionPageState extends State<TractionPage> {
   _ClassLeaderboardScope _classLeaderboardScope = _ClassLeaderboardScope.global;
 
   final Map<String, TextEditingController> _dynamicControllers = {};
-  final Map<String, String?> _enumSelections = {};
+  final Map<String, dynamic> _enumSelections = {};
   bool _restoredFromPrefs = false;
   static const int _pageSize = 100;
   int _lastTractionOffset = 0;
   String? _lastQuerySignature;
   String? _transferFromLabel;
   bool _isSearching = false;
-  bool _classExporting = false;
+  bool _exporting = false;
 
   @override
   void initState() {
@@ -169,12 +170,7 @@ class _TractionPageState extends State<TractionPage> {
     ].join(';');
   }
 
-  Future<void> _refreshTraction({
-    bool append = false,
-    bool preservePosition = true,
-  }) async {
-    _setState(() => _isSearching = true);
-    final data = context.read<DataService>();
+  Map<String, dynamic> _buildTractionFilters() {
     final filters = <String, dynamic>{};
     final name = _nameController.text.trim();
     if (name.isNotEmpty) filters['name'] = name;
@@ -187,6 +183,16 @@ class _TractionPageState extends State<TractionPage> {
         filters[key] = value;
       }
     });
+    return filters;
+  }
+
+  Future<void> _refreshTraction({
+    bool append = false,
+    bool preservePosition = true,
+  }) async {
+    _setState(() => _isSearching = true);
+    final data = context.read<DataService>();
+    final filters = _buildTractionFilters();
     final hadOnly = !_hasFilters;
     final signature = _tractionQuerySignature(filters, hadOnly);
     final queryChanged =
@@ -673,23 +679,6 @@ class _TractionPageState extends State<TractionPage> {
     );
 
     final hasClassActions = _hasClassQuery;
-    final classLabel = _currentClassLabel;
-
-    final exportClassButton = !hasClassActions
-        ? null
-        : FilledButton.tonalIcon(
-            onPressed: _classExporting ? null : _exportSelectedClass,
-            icon: _classExporting
-                ? const SizedBox(
-                    height: 16,
-                    width: 16,
-                    child: CircularProgressIndicator(strokeWidth: 2),
-                  )
-                : const Icon(Icons.download),
-            label: Text(
-              _classExporting ? 'Exporting...' : 'Export $classLabel',
-            ),
-          );
 
     final newTractionButton = FilledButton.icon(
       onPressed: () async {
@@ -710,7 +699,7 @@ class _TractionPageState extends State<TractionPage> {
     );
 
     final hasAdminActions = isElevated;
-    final hasMoreMenu = hasClassActions || hasAdminActions;
+    final hasMoreMenu = true;
 
     final moreButton = !hasMoreMenu
         ? null
@@ -718,6 +707,9 @@ class _TractionPageState extends State<TractionPage> {
             tooltip: 'More options',
             onSelected: (action) async {
               switch (action) {
+                case _TractionMoreAction.exportResults:
+                  await _exportTractionResults();
+                  break;
                 case _TractionMoreAction.classStats:
                   _toggleClassStatsPanel();
                   break;
@@ -759,6 +751,25 @@ class _TractionPageState extends State<TractionPage> {
             },
             itemBuilder: (context) {
               final items = <PopupMenuEntry<_TractionMoreAction>>[];
+              items.add(
+                PopupMenuItem(
+                  value: _TractionMoreAction.exportResults,
+                  child: Row(
+                    children: [
+                      if (_exporting)
+                        const SizedBox(
+                          height: 16,
+                          width: 16,
+                          child: CircularProgressIndicator(strokeWidth: 2),
+                        )
+                      else
+                        const Icon(Icons.download, size: 18),
+                      const SizedBox(width: 8),
+                      Text(_exporting ? 'Exporting...' : 'Export'),
+                    ],
+                  ),
+                ),
+              );
               if (hasClassActions) {
                 items.add(
                   PopupMenuItem(
@@ -847,14 +858,12 @@ class _TractionPageState extends State<TractionPage> {
 
     final desktopActions = [
       refreshButton,
-      if (exportClassButton != null) exportClassButton,
       newTractionButton,
       if (moreButton != null) moreButton,
     ];
 
     final mobileActions = [
       if (moreButton != null) moreButton,
-      if (exportClassButton != null) exportClassButton,
       newTractionButton,
       refreshButton,
     ];
@@ -882,23 +891,36 @@ class _TractionPageState extends State<TractionPage> {
     );
   }
 
-  Future<void> _exportSelectedClass() async {
-    if (_classExporting) return;
-    final classLabel = _currentClassLabel;
-    if (classLabel.isEmpty) return;
-    setState(() => _classExporting = true);
+  Future<void> _exportTractionResults() async {
+    if (_exporting) return;
+    setState(() => _exporting = true);
     final messenger = ScaffoldMessenger.of(context);
     try {
       final data = context.read<DataService>();
-      final encodedClass = Uri.encodeComponent(classLabel);
-      final response = await data.api.getBytes(
-        '/loco/class/export/$encodedClass',
+      final filters = _buildTractionFilters();
+      final hadOnly = !_hasFilters;
+      final limit = data.traction.length;
+      final params = StringBuffer('?limit=$limit&offset=0');
+      if (hadOnly) params.write('&had_only=true');
+      if (!_mileageFirst) params.write('&mileage_first=false');
+
+      final payload = <String, dynamic>{};
+      final classLabel = (_selectedClass ?? _classController.text).trim();
+      if (classLabel.isNotEmpty) payload['class'] = classLabel;
+      final numberLabel = _numberController.text.trim();
+      if (numberLabel.isNotEmpty) payload['number'] = numberLabel;
+      filters.forEach((key, value) {
+        if (value == null) return;
+        if (value is String && value.trim().isEmpty) return;
+        payload[key] = value;
+      });
+
+      final response = await data.api.postBytes(
+        '/locos/search/v2/export${params.toString()}',
+        payload.isEmpty ? null : payload,
         headers: const {'accept': '*/*'},
       );
-      final safeClassName =
-          classLabel.replaceAll(RegExp(r'[^a-zA-Z0-9-_]+'), '_');
-      final fallbackName = 'traction-${safeClassName.isEmpty ? 'class' : safeClassName}.xlsx';
-      final filename = response.filename ?? fallbackName;
+      final filename = response.filename ?? 'traction-export.xlsx';
       final saveResult = await saveBytes(
         Uint8List.fromList(response.bytes),
         filename,
@@ -932,7 +954,7 @@ class _TractionPageState extends State<TractionPage> {
         SnackBar(content: Text('Export failed: $e')),
       );
     } finally {
-      if (mounted) setState(() => _classExporting = false);
+      if (mounted) setState(() => _exporting = false);
     }
   }
 
@@ -1847,13 +1869,44 @@ class _TractionPageState extends State<TractionPage> {
     bool isMobile,
   ) {
     final width = isMobile ? double.infinity : 220.0;
+    final type = field.type?.toLowerCase() ?? '';
+    final isBooleanField =
+        type == 'bool' || type == 'boolean' || type.contains('bool');
+    if (isBooleanField) {
+      final currentValue = _enumSelections[field.name];
+      final safeValue = currentValue is bool ? currentValue : null;
+      return SizedBox(
+        width: width,
+        child: DropdownButtonFormField<bool?>(
+          value: safeValue,
+          decoration: InputDecoration(
+            labelText: field.display,
+            border: const OutlineInputBorder(),
+          ),
+          items: const [
+            DropdownMenuItem(value: null, child: Text('Any')),
+            DropdownMenuItem(value: true, child: Text('Yes')),
+            DropdownMenuItem(value: false, child: Text('No')),
+          ],
+          onChanged: (val) {
+            setState(() {
+              _enumSelections[field.name] = val;
+            });
+            _refreshTraction();
+          },
+        ),
+      );
+    }
     if (field.enumValues != null && field.enumValues!.isNotEmpty) {
       final options = field.enumValues!
           .map((e) => e.toString())
           .toSet()
           .toList();
       final currentValue = _enumSelections[field.name];
-      final safeValue = options.contains(currentValue) ? currentValue : null;
+      final safeValue =
+          currentValue is String && options.contains(currentValue)
+              ? currentValue
+              : null;
       return SizedBox(
         width: width,
         child: DropdownButtonFormField<String?>(
@@ -1883,7 +1936,6 @@ class _TractionPageState extends State<TractionPage> {
     _dynamicControllers[field.name] = controller;
     TextInputType? inputType;
     if (field.type != null) {
-      final type = field.type!.toLowerCase();
       if (type.contains('int') ||
           type.contains('num') ||
           type.contains('double')) {