added support for multiple accounts with an account switcher in settings

lib/state/app/modules/account/bloc/account_state.dart

@@ -1,9 +1,18 @@
-enum AccountStatus { undefined, loggedIn, loggedOut }
+enum AccountStatus { undefined, loggedIn, loggedOut, addingAccount }
 
 class AccountState {
   final AccountStatus status;
-  const AccountState({this.status = AccountStatus.undefined});
 
-  AccountState copyWith({AccountStatus? status}) =>
-      AccountState(status: status ?? this.status);
+  /// Active account; the account-scoped part of the app is keyed by it.
+  final String? accountId;
+
+  /// Set when [accountId] came from a login (not a switch), to show the
+  /// post-login splash.
+  final bool freshLogin;
+
+  const AccountState({
+    this.status = AccountStatus.undefined,
+    this.accountId,
+    this.freshLogin = false,
+  });
 }