Add show overlaps in public keys of repeaters functionality and localization support

lib/models/app_settings.dart

@@ -18,6 +18,7 @@ class AppSettings {
   final bool mapShowRepeaters;
   final bool mapShowChatNodes;
   final bool mapShowOtherNodes;
+  final bool mapShowOverlaps;
   final double mapTimeFilterHours; // 0 = all time
   final bool mapKeyPrefixEnabled;
   final String mapKeyPrefix;
@@ -53,6 +54,7 @@ class AppSettings {
     this.mapShowRepeaters = true,
     this.mapShowChatNodes = true,
     this.mapShowOtherNodes = true,
+    this.mapShowOverlaps = false,
     this.mapTimeFilterHours = 0, // Default to all time
     this.mapKeyPrefixEnabled = false,
     this.mapKeyPrefix = '',
@@ -92,6 +94,7 @@ class AppSettings {
       'map_show_repeaters': mapShowRepeaters,
       'map_show_chat_nodes': mapShowChatNodes,
       'map_show_other_nodes': mapShowOtherNodes,
+      'map_show_overlaps': mapShowOverlaps,
       'map_time_filter_hours': mapTimeFilterHours,
       'map_key_prefix_enabled': mapKeyPrefixEnabled,
       'map_key_prefix': mapKeyPrefix,
@@ -137,6 +140,7 @@ class AppSettings {
       mapShowRepeaters: json['map_show_repeaters'] as bool? ?? true,
       mapShowChatNodes: json['map_show_chat_nodes'] as bool? ?? true,
       mapShowOtherNodes: json['map_show_other_nodes'] as bool? ?? true,
+      mapShowOverlaps: json['map_show_overlaps'] as bool? ?? false,
       mapTimeFilterHours:
           (json['map_time_filter_hours'] as num?)?.toDouble() ?? 0,
       mapKeyPrefixEnabled: json['map_key_prefix_enabled'] as bool? ?? false,
@@ -196,6 +200,7 @@ class AppSettings {
     bool? mapShowRepeaters,
     bool? mapShowChatNodes,
     bool? mapShowOtherNodes,
+    bool? mapShowOverlaps,
     double? mapTimeFilterHours,
     bool? mapKeyPrefixEnabled,
     String? mapKeyPrefix,
@@ -231,6 +236,7 @@ class AppSettings {
       mapShowRepeaters: mapShowRepeaters ?? this.mapShowRepeaters,
       mapShowChatNodes: mapShowChatNodes ?? this.mapShowChatNodes,
       mapShowOtherNodes: mapShowOtherNodes ?? this.mapShowOtherNodes,
+      mapShowOverlaps: mapShowOverlaps ?? this.mapShowOverlaps,
       mapTimeFilterHours: mapTimeFilterHours ?? this.mapTimeFilterHours,
       mapKeyPrefixEnabled: mapKeyPrefixEnabled ?? this.mapKeyPrefixEnabled,
       mapKeyPrefix: mapKeyPrefix ?? this.mapKeyPrefix,