Hide UI and serverside check against adding a new team after tournament started

app/features/tournament-admin/actions/to.$id.admin.registration.server.ts

@@ -11,7 +11,7 @@ import {
 import * as TournamentLFGRepository from "~/features/tournament-lfg/TournamentLFGRepository.server";
 import { parseFormDataWithImages } from "~/form/parse.server";
 import invariant from "~/utils/invariant";
-import { parseParams } from "~/utils/remix.server";
+import { errorToastIfFalsy, parseParams } from "~/utils/remix.server";
 import { tournamentAdminPage } from "~/utils/urls";
 import { idObject } from "~/utils/zod";
 import { adminRegistrationFormSchemaServer } from "../tournament-admin-registration-schemas.server";
@@ -50,6 +50,8 @@ export const action: ActionFunction = async ({ request, params }) => {
 		team = tournament.teamById(data.tournamentTeamId);
 	}
 
+	errorToastIfFalsy(team || !tournament.hasStarted, "Tournament has started");
+
 	const currentMemberIds = team?.members.map((member) => member.userId) ?? [];
 	const submittedMemberIds = submittedMembers.map((member) => member.userId);
 	const membersToAdd = submittedMemberIds.filter(

app/features/tournament-admin/routes/to.$id.admin._index.tsx

@@ -72,7 +72,7 @@ export default function TournamentAdminTeamsPage() {
 					>
 						Export
 					</SendouButton>
-					{!tournament.ctx.isFinalized ? (
+					{!tournament.hasStarted ? (
 						<LinkButton
 							size="small"
 							icon={<Plus />}