feat: Add GPX import/export functionality and enhance trail management

- Implemented GPX export and import features in GpxService for location trails.
- Added UI controls for exporting and importing trails in the TrailControls widget.
- Introduced localization strings for GPX operations in Italian and Slovenian.
- Enhanced MapProvider to manage imported trails and toggle visibility for contact trails.
- Updated trail color management with TrailColorService for consistent color assignment based on contact roles.
- Improved UI for displaying contact trails with toggle options for individual and all contact trails.
- Refactored detailed compass dialog to remove unnecessary path toggle button for contacts.

lib/l10n/app_localizations_it.dart

@@ -1401,6 +1401,65 @@ class AppLocalizationsIt extends AppLocalizations {
   @override
   String get trailControls => 'Controlli Traccia';
 
+  @override
+  String get exportTrailToGpx => 'Esporta traccia in GPX';
+
+  @override
+  String get importTrailFromGpx => 'Importa traccia da GPX';
+
+  @override
+  String get trailExportedSuccessfully => 'Traccia esportata con successo!';
+
+  @override
+  String get failedToExportTrail => 'Esportazione traccia fallita';
+
+  @override
+  String failedToImportTrail(String error) {
+    return 'Importazione traccia fallita: $error';
+  }
+
+  @override
+  String get importTrail => 'Importa traccia';
+
+  @override
+  String importTrailQuestion(int pointCount) {
+    return 'Importare traccia con $pointCount punti?\n\nPuoi sostituire la tua traccia attuale o visualizzarla affiancata.';
+  }
+
+  @override
+  String get viewAlongside => 'Visualizza affiancata';
+
+  @override
+  String get replaceCurrent => 'Sostituisci attuale';
+
+  @override
+  String trailImported(int pointCount) {
+    return 'Traccia importata! ($pointCount punti)';
+  }
+
+  @override
+  String trailReplaced(int pointCount) {
+    return 'Traccia sostituita! ($pointCount punti)';
+  }
+
+  @override
+  String get contactTrails => 'Tracce contatti';
+
+  @override
+  String get showAllContactTrails => 'Mostra tutte le tracce dei contatti';
+
+  @override
+  String get noContactsWithLocationHistory =>
+      'Nessun contatto con cronologia posizione';
+
+  @override
+  String showingTrailsForContacts(int count) {
+    return 'Visualizzazione tracce per $count contatti';
+  }
+
+  @override
+  String get individualContactTrails => 'Tracce individuali dei contatti';
+
   @override
   String get deviceInformation => 'Informazioni Dispositivo';