feat: Implement command queue for BLE command handling

- Added BleCommandQueue to manage command serialization and responses in BleCommandSender.
- Updated writeData, writeDataAndWaitForAck, and writeDataAndWaitForResponse methods to utilize the command queue.
- Enhanced BleResponseHandler to complete commands based on responses received from the BLE device.
- Introduced new commands for channel management, including getChannel and setChannel.
- Created LocationTrailLayer and TrailControls widgets for displaying and managing location trails on the map.
- Added PermissionRequestDialog to handle location permission requests on app startup.
- Updated LocationTrackingService to allow GPS tracking without a BLE connection.

lib/l10n/app_localizations_hr.dart

@@ -51,6 +51,10 @@ class AppLocalizationsHr extends AppLocalizations {
   String get locationPermissionPermanentlyDenied =>
       'Dopuštenje za lokaciju trajno odbijeno. Molimo omogućite u Postavkama.';
 
+  @override
+  String get locationPermissionRequired =>
+      'Dopuštenje za lokaciju potrebno je za GPS praćenje i koordinaciju tima. Možete ga omogućiti kasnije u Postavkama.';
+
   @override
   String get locationServicesDisabled =>
       'Usluge lokacije su onemogućene. Molimo omogućite ih u Postavkama.';
@@ -233,7 +237,7 @@ class AppLocalizationsHr extends AppLocalizations {
       'Učitajte ili očistite primjere kontakata, poruka kanala i SAR markera za testiranje';
 
   @override
-  String get loadSampleData => 'Učitaj primjer podataka';
+  String get loadSampleData => 'Učitaj primjer';
 
   @override
   String get clearAllData => 'Očisti sve podatke';
@@ -701,6 +705,9 @@ class AppLocalizationsHr extends AppLocalizations {
   @override
   String get rooms => 'Sobe';
 
+  @override
+  String get channels => 'Kanali';
+
   @override
   String get cacheStatistics => 'Statistika predmemorije';