ios: share the create-and-refresh step between both pickers

Both create functions repeated the same create + listUsers + model
update; only the final action differs. Extract it next to
apiCreateActiveUser, as Kotlin already does with
createProfileForInvitation.

apps/ios/Shared/Model/SimpleXAPI.swift

@@ -259,6 +259,14 @@ func apiCreateActiveUser(_ p: Profile?, pastTimestamp: Bool = false, keepActiveU
     throw r.unexpected
 }
 
+func createProfileKeepingActiveUser(_ profile: Profile) async throws -> User {
+    let newUser = try apiCreateActiveUser(profile, keepActiveUser: true)
+    if let users = try? await listUsersAsync() {
+        await MainActor.run { ChatModel.shared.users = users }
+    }
+    return newUser
+}
+
 func listUsers() throws -> [UserInfo] {
     return try listUsersResponse(chatSendCmdSync(.listUsers))
 }