refactor(frontend): scripts -> utility

packages/frontend/src/utility/get-user-name.ts

@@ -0,0 +1,8 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+export default function(user: { name?: string | null, username: string }): string {
+	return user.name === '' ? user.username : user.name ?? user.username;
+}