fix: add lang="ts" to Svelte script tags using TypeScript syntax (#21001)

fix: add lang="ts" to Svelte script tags using

TypeScript syntax
Two Svelte components were using TypeScript type annotations (ReturnType<typeof setTimeout>)
but their script tags were missing the lang="ts" attribute. This caused Vite/Svelte to parse
them as plain JavaScript, resulting in parse errors.

Fixed files:
- src/lib/components/admin/Users/UserList.svelte
- src/lib/components/channel/ChannelInfoModal/UserList.svelte

src/lib/components/channel/ChannelInfoModal/UserList.svelte

@@ -1,4 +1,4 @@
-<script>
+<script lang="ts">
 	import { WEBUI_API_BASE_URL, WEBUI_BASE_URL } from '$lib/constants';
 	import { WEBUI_NAME, config, user as _user, showSidebar } from '$lib/stores';
 	import { goto } from '$app/navigation';