refactor(neon): Await active account

packages/neon/neon/lib/src/app.dart

@@ -227,7 +227,7 @@ class _NeonAppState extends State<NeonApp> with WidgetsBindingObserver, tray.Tra
     }
 
     final matches = _appRegex.allMatches(shortcutType);
-    final activeAccount = _accountsBloc.activeAccount.valueOrNull;
+    final activeAccount = await _accountsBloc.activeAccount.first;
     if (matches.isNotEmpty && activeAccount != null) {
       await _openAppFromExternal(activeAccount, matches.first.group(1)!);
     }

packages/neon/neon/lib/src/blocs/accounts.dart

@@ -130,7 +130,7 @@ class AccountsBloc extends Bloc implements AccountsBlocEvents, AccountsBlocState
   BehaviorSubject<List<Account>> accounts = BehaviorSubject<List<Account>>.seeded([]);
 
   @override
-  BehaviorSubject<Account?> activeAccount = BehaviorSubject<Account?>.seeded(null)
+  BehaviorSubject<Account?> activeAccount = BehaviorSubject<Account?>()
     ..distinct((final current, final next) => current?.id != next?.id);
 
   @override
@@ -191,10 +191,10 @@ class AccountsBloc extends Bloc implements AccountsBlocEvents, AccountsBlocState
 
   /// The currently active account.
   ///
-  /// Equivalent to activeAccount.value but throws a [StateError] when no user is logged in.
+  /// Equivalent to activeAccount.valueOrNull but throws a [StateError] when no user is logged in.
   @visibleForTesting
   Account get aa {
-    final aa = activeAccount.value;
+    final aa = activeAccount.valueOrNull;
 
     if (aa == null) {
       throw StateError('No user is logged in.');
@@ -204,7 +204,7 @@ class AccountsBloc extends Bloc implements AccountsBlocEvents, AccountsBlocState
   }
 
   /// Whether accounts are logged in.
-  bool get hasAccounts => activeAccount.value != null;
+  bool get hasAccounts => activeAccount.valueOrNull != null;
 
   /// The options for the [activeAccount].
   ///

packages/neon/neon/lib/src/pages/account_settings.dart

@@ -41,7 +41,7 @@ class AccountSettingsPage extends StatelessWidget {
               context,
               AppLocalizations.of(context).accountOptionsRemoveConfirm(account.client.humanReadableID),
             )) {
-              final isActive = bloc.activeAccount.value == account;
+              final isActive = bloc.activeAccount.valueOrNull == account;
 
               bloc.removeAccount(account);