add ability for non admins to add new traction, pending approval. Various QoL updates

lib/objects/objects.dart

@@ -753,6 +753,9 @@ class LocoSummary extends Loco {
   final String? owner;
   final String? livery;
   final String? location;
+  final String? visibility;
+  final String? matchedNumber;
+  final DateTime? matchedNumberValidTo;
   final Map<String, dynamic> extra;
 
   LocoSummary({
@@ -772,6 +775,9 @@ class LocoSummary extends Loco {
     this.owner,
     this.livery,
     this.location,
+    this.visibility,
+    this.matchedNumber,
+    this.matchedNumberValidTo,
     Map<String, dynamic>? extra,
     super.powering = true,
     super.allocPos = 0,
@@ -808,6 +814,9 @@ class LocoSummary extends Loco {
     owner: json['owner'] ?? json['loco_owner'],
     livery: json['livery'],
     location: json['location'],
+    visibility: json['visibility']?.toString(),
+    matchedNumber: json['matched_number']?.toString(),
+    matchedNumberValidTo: _asNullableDateTime(json['matched_number_valid_to']),
     extra: Map<String, dynamic>.from(json),
     powering: _asBool(json['alloc_powering'] ?? json['powering'], true),
     allocPos: _asInt(json['alloc_pos'], 0),
@@ -835,6 +844,8 @@ class LocoAttrVersion {
   final String? precisionLevel;
   final String? maskedValidFrom;
   final dynamic valueNorm;
+  final bool isPending;
+  final bool canModeratePending;
 
   const LocoAttrVersion({
     required this.attrCode,
@@ -857,6 +868,8 @@ class LocoAttrVersion {
     this.precisionLevel,
     this.maskedValidFrom,
     this.valueNorm,
+    this.isPending = false,
+    this.canModeratePending = false,
   });
 
   factory LocoAttrVersion.fromJson(Map<String, dynamic> json) {
@@ -881,6 +894,8 @@ class LocoAttrVersion {
       precisionLevel: json['precision_level']?.toString(),
       maskedValidFrom: json['masked_valid_from']?.toString(),
       valueNorm: json['value_norm'],
+      isPending: json['is_pending'] == true,
+      canModeratePending: json['can_moderate_pending'] == true,
     );
   }
 
@@ -916,17 +931,21 @@ class LocoAttrVersion {
       });
     }
     items.sort(
-      (a, b) {
-        final aDate = a.validFrom ?? a.txnFrom ?? DateTime.fromMillisecondsSinceEpoch(0);
-        final bDate = b.validFrom ?? b.txnFrom ?? DateTime.fromMillisecondsSinceEpoch(0);
-        final dateCompare = aDate.compareTo(bDate);
-        if (dateCompare != 0) return dateCompare;
-        return a.attrCode.compareTo(b.attrCode);
-      },
+      compareByStart,
     );
     return items;
   }
 
+  static int compareByStart(LocoAttrVersion a, LocoAttrVersion b) {
+    final aDate =
+        a.validFrom ?? a.txnFrom ?? DateTime.fromMillisecondsSinceEpoch(0);
+    final bDate =
+        b.validFrom ?? b.txnFrom ?? DateTime.fromMillisecondsSinceEpoch(0);
+    final dateCompare = aDate.compareTo(bDate);
+    if (dateCompare != 0) return dateCompare;
+    return a.attrCode.compareTo(b.attrCode);
+  }
+
   String get valueLabel {
     if (valueStr != null && valueStr!.isNotEmpty) return valueStr!;
     if (valueEnum != null && valueEnum!.isNotEmpty) return valueEnum!;