Replace deprecated i18next-parser with i18next-cli

src/utils/i18n.ts

@@ -0,0 +1,9 @@
+/*
+Copyright 2026 New Vector Ltd.
+
+SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+Please see LICENSE in the repository root for full details.
+*/
+
+// Custom marker function to allow i18next extraction
+export const i18nKey = (key: string): string => key;