fix: auto-start advertising on launch and optimize BLE packet for better discovery

Author: CreatorJohn

lib/src/core/background_service.dart

@@ -86,7 +86,6 @@ Future<void> _startServiceLogic(
   ServiceInstance service,
   BLEAdvertiser advertiser,
 ) async {
-  await Future.delayed(const Duration(seconds: 1));
   final prefs = await SharedPreferences.getInstance();
   String currentName = prefs.getString('advertising_name_v2') ?? "BLE Node";
   bool advertisingOn = false;

lib/src/features/discovery/data/ble_advertiser.dart

@@ -24,7 +24,7 @@ class BLEAdvertiser {
   static const messageCharUuid = '12345678-90ab-cdef-1234-567890abcdef';
 
   static const int manufacturerId = MeshConstants.manufacturerId;
-  static const int maxNameLength = 13;
+  static const int maxNameLength = 10;
 
   static bool _initialized = false,
       _servicesAdded = false,
@@ -209,7 +209,7 @@ class BLEAdvertiser {
         manufacturerId: manufacturerId,
         data: manufacturerData,
       ),
-      addManufacturerDataInScanResponse: false, // Move StableId to primary packet
+      addManufacturerDataInScanResponse: true, // Allow OS to balance between packets
       scanResponseManufacturerData: ManufacturerData(
         manufacturerId: manufacturerId,
         data: scanResponseData,

lib/src/features/onboarding/presentation/onboarding_controller.dart

@@ -17,8 +17,12 @@ class OnboardingController extends _$OnboardingController {
     final user = await ref.watch(profileControllerProvider.future);
     final isOnboarded = user?.isOnboarded ?? false;
     if (isOnboarded) {
-      _log.info('User already onboarded, ensuring service is running');
-      await initializeBackgroundService().catchError((e) {
+      _log.info('User already onboarded, ensuring service is running and advertising is active');
+      await initializeBackgroundService().then((_) {
+        if (user != null) {
+          FlutterBackgroundService().invoke("startAdvertising", {"name": user.username});
+        }
+      }).catchError((e) {
         _log.severe('Failed to auto-start background service: $e');
       });
     }