refactor: simplify IsAdvertising to a StreamProvider and handle AsyncValue in UI

Author: CreatorJohn

lib/src/features/discovery/presentation/advertising_state.dart

@@ -22,18 +22,9 @@ class CanAdvertise extends _$CanAdvertise {
 }
 
 @riverpod
-class IsAdvertising extends _$IsAdvertising {
-  final FlutterBackgroundService _service = FlutterBackgroundService();
-
-  @override
-  bool build() {
-    _service.on("advertisingChange").listen((event) {
-      final bool? active = event?["active"];
-      if (active != null) state = active;
-    });
-
-    return false;
-  }
+Stream<bool> isAdvertising(Ref ref) {
+  final service = FlutterBackgroundService();
+  return service.on("advertisingChange").map((event) => event?["active"] ?? false);
 }
 
 @riverpod

lib/src/features/discovery/presentation/discovery_screen.dart

@@ -146,7 +146,7 @@ class _DiscoveryScreenState extends ConsumerState<DiscoveryScreen> {
   @override
   Widget build(BuildContext context) {
     final devicesAsync = ref.watch(discoveryControllerProvider);
-    final isAdvertising = ref.watch(isAdvertisingProvider);
+    final isAdvertising = ref.watch(isAdvertisingProvider).value ?? false;
     final scanProgress = ref.watch(scanProgressProvider).value ?? 0.0;
 
     return Scaffold(

lib/src/features/profile/presentation/profile_screen.dart

@@ -47,7 +47,7 @@ class _ProfileScreenState extends ConsumerState<ProfileScreen> {
   @override
   Widget build(BuildContext context) {
     final profileAsync = ref.watch(profileControllerProvider);
-    final isAdvertising = ref.watch(isAdvertisingProvider);
+    final isAdvertising = ref.watch(isAdvertisingProvider).value ?? false;
 
     return Scaffold(
       body: profileAsync.when(