feat(account): add ability to sign in with login code (#271)

Co-authored-by: Elias Schneider <login@eliasschneider.com>

frontend/src/routes/settings/account/login-code-modal.svelte

@@ -0,0 +1,62 @@
+<script lang="ts">
+	import { page } from '$app/state';
+	import CopyToClipboard from '$lib/components/copy-to-clipboard.svelte';
+	import * as Dialog from '$lib/components/ui/dialog';
+	import { Separator } from '$lib/components/ui/separator';
+	import UserService from '$lib/services/user-service';
+	import { axiosErrorToast } from '$lib/utils/error-util';
+
+	let {
+		show = $bindable()
+	}: {
+		show: boolean;
+	} = $props();
+
+	const userService = new UserService();
+
+	let code: string | null = $state(null);
+
+	$effect(() => {
+		if (show) {
+			const expiration = new Date(Date.now() + 15 * 60 * 1000);
+			userService
+				.createOneTimeAccessToken(expiration, 'me')
+				.then((c) => (code = c))
+				.catch((e) => axiosErrorToast(e));
+		}
+	});
+
+	function onOpenChange(open: boolean) {
+		if (!open) {
+			code = null;
+			show = false;
+		}
+	}
+</script>
+
+<Dialog.Root open={!!code} {onOpenChange}>
+	<Dialog.Content class="max-w-md">
+		<Dialog.Header>
+			<Dialog.Title>Login Code</Dialog.Title>
+			<Dialog.Description
+				>Sign in using the following code. The code will expire in 15 minutes.
+			</Dialog.Description>
+		</Dialog.Header>
+
+		<div class="flex flex-col items-center gap-2">
+			<CopyToClipboard value={code!}>
+				<p class="text-3xl font-semibold">{code}</p>
+			</CopyToClipboard>
+			<div class="text-muted-foreground flex items-center justify-center gap-3">
+				<Separator />
+				<p class="text-nowrap text-xs">or visit</p>
+				<Separator />
+			</div>
+			<div>
+				<CopyToClipboard value={page.url.origin + '/lc/' + code!}>
+					<p data-testId="login-code-link">{page.url.origin + '/lc/' + code!}</p>
+				</CopyToClipboard>
+			</div>
+		</div>
+	</Dialog.Content>
+</Dialog.Root>