enh: temp chat

deprecates chat history setting and introduces temp chat from model selector

src/lib/components/layout/Sidebar.svelte

@@ -13,7 +13,8 @@
 		showArchivedChats,
 		pinnedChats,
 		scrollPaginationEnabled,
-		currentChatPage
+		currentChatPage,
+		temporaryChatEnabled
 	} from '$lib/stores';
 	import { onMount, getContext, tick } from 'svelte';
 
@@ -380,47 +381,10 @@
 		{/if}
 
 		<div class="relative flex flex-col flex-1 overflow-y-auto">
-			{#if !($settings.saveChatHistory ?? true)}
-				<div class="absolute z-40 w-full h-full bg-gray-50/90 dark:bg-black/90 flex justify-center">
-					<div class=" text-left px-5 py-2">
-						<div class=" font-medium">{$i18n.t('Chat History is off for this browser.')}</div>
-						<div class="text-xs mt-2">
-							{$i18n.t(
-								"When history is turned off, new chats on this browser won't appear in your history on any of your devices."
-							)}
-							<span class=" font-semibold"
-								>{$i18n.t('This setting does not sync across browsers or devices.')}</span
-							>
-						</div>
-
-						<div class="mt-3">
-							<button
-								class="flex justify-center items-center space-x-1.5 px-3 py-2.5 rounded-lg text-xs bg-gray-100 hover:bg-gray-200 transition text-gray-800 font-medium w-full"
-								type="button"
-								on:click={() => {
-									saveSettings({
-										saveChatHistory: true
-									});
-								}}
-							>
-								<svg
-									xmlns="http://www.w3.org/2000/svg"
-									viewBox="0 0 16 16"
-									fill="currentColor"
-									class="w-3 h-3"
-								>
-									<path
-										fill-rule="evenodd"
-										d="M8 1a.75.75 0 0 1 .75.75v6.5a.75.75 0 0 1-1.5 0v-6.5A.75.75 0 0 1 8 1ZM4.11 3.05a.75.75 0 0 1 0 1.06 5.5 5.5 0 1 0 7.78 0 .75.75 0 0 1 1.06-1.06 7 7 0 1 1-9.9 0 .75.75 0 0 1 1.06 0Z"
-										clip-rule="evenodd"
-									/>
-								</svg>
-
-								<div>{$i18n.t('Enable Chat History')}</div>
-							</button>
-						</div>
-					</div>
-				</div>
+			{#if $temporaryChatEnabled}
+				<div
+					class="absolute z-40 w-full h-full bg-gray-50/90 dark:bg-black/90 flex justify-center"
+				></div>
 			{/if}
 
 			<div class="px-2 mt-0.5 mb-2 flex justify-center space-x-2">