fix: add null checks to chat iterators in ArchivedChats and FolderPlaceholder (#19898)

src/lib/components/layout/ArchivedChatsModal.svelte

@@ -1,5 +1,7 @@
 <script lang="ts">
+	// @ts-ignore
 	import fileSaver from 'file-saver';
+	import type { Writable } from 'svelte/store';
 	const { saveAs } = fileSaver;
 
 	import { toast } from 'svelte-sonner';
@@ -15,13 +17,13 @@
 	import UnarchiveAllConfirmDialog from '$lib/components/common/ConfirmDialog.svelte';
 	import Spinner from '../common/Spinner.svelte';
 
-	const i18n = getContext('i18n');
+	const i18n: Writable<any> = getContext('i18n');
 
 	export let show = false;
 	export let onUpdate = () => {};
 
 	let loading = false;
-	let chatList = null;
+	let chatList: any[] | null = null;
 	let page = 1;
 
 	let query = '';
@@ -30,13 +32,13 @@
 
 	let allChatsLoaded = false;
 	let chatListLoading = false;
-	let searchDebounceTimeout;
+	let searchDebounceTimeout: any;
 
 	let showUnarchiveAllConfirmDialog = false;
 
-	let filter = {};
+	let filter: any = {};
 	$: filter = {
-		...(query ? { query: query } : {}),
+		...(query ? { query } : {}),
 		...(orderBy ? { order_by: orderBy } : {}),
 		...(direction ? { direction } : {})
 	};
@@ -88,7 +90,7 @@
 		allChatsLoaded = newChatList.length === 0;
 
 		if (newChatList.length > 0) {
-			chatList = [...chatList, ...newChatList];
+			chatList = [...(chatList || []), ...newChatList];
 		}
 
 		chatListLoading = false;
@@ -102,7 +104,7 @@
 		saveAs(blob, `${$i18n.t('archived-chat-export')}-${Date.now()}.json`);
 	};
 
-	const unarchiveHandler = async (chatId) => {
+	const unarchiveHandler = async (chatId: string) => {
 		const res = await archiveChatById(localStorage.token, chatId).catch((error) => {
 			toast.error(`${error}`);
 		});