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

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

frontend/src/routes/login/alternative/email/+page.svelte

@@ -0,0 +1,71 @@
+<script lang="ts">
+	import { page } from '$app/state';
+	import SignInWrapper from '$lib/components/login-wrapper.svelte';
+	import { Button } from '$lib/components/ui/button';
+	import Input from '$lib/components/ui/input/input.svelte';
+	import UserService from '$lib/services/user-service';
+	import { fade } from 'svelte/transition';
+	import LoginLogoErrorSuccessIndicator from '../../components/login-logo-error-success-indicator.svelte';
+
+	const { data } = $props();
+
+	const userService = new UserService();
+
+	let email = $state('');
+	let isLoading = $state(false);
+	let error: string | undefined = $state(undefined);
+	let success = $state(false);
+
+	async function requestEmail() {
+		isLoading = true;
+		await userService
+			.requestOneTimeAccessEmail(email, data.redirect)
+			.then(() => (success = true))
+			.catch((e) => (error = e.response?.data.error || 'An unknown error occured'));
+
+		isLoading = false;
+	}
+</script>
+
+<svelte:head>
+	<title>Email Login</title>
+</svelte:head>
+
+<SignInWrapper>
+	<div class="flex justify-center">
+		<LoginLogoErrorSuccessIndicator {success} error={!!error} />
+	</div>
+	<h1 class="font-playfair mt-5 text-3xl font-bold sm:text-4xl">Email Login</h1>
+	{#if error}
+		<p class="text-muted-foreground mt-2" in:fade>
+			{error}. Please try again.
+		</p>
+		<div class="mt-10 flex w-full justify-stretch gap-2">
+			<Button variant="secondary" class="w-full" href="/">Go back</Button>
+			<Button class="w-full" onclick={() => (error = undefined)}>Try again</Button>
+		</div>
+	{:else if success}
+		<p class="text-muted-foreground mt-2" in:fade>
+			An email has been sent to the provided email, if it exists in the system.
+		</p>
+		<div class="mt-8 flex w-full justify-stretch gap-2">
+			<Button variant="secondary" class="w-full" href={'/login/alternative' + page.url.search}
+				>Go back</Button
+			>
+			<Button class="w-full" href={'/login/alternative/code' + page.url.search}>Enter code</Button>
+		</div>
+	{:else}
+		<form onsubmit={requestEmail} class="w-full max-w-[450px]">
+			<p class="text-muted-foreground mt-2" in:fade>
+				Enter your email address to receive an email with a login code.
+			</p>
+			<Input id="Email" class="mt-7" placeholder="Your email" bind:value={email} />
+			<div class="mt-8 flex justify-stretch gap-2">
+				<Button variant="secondary" class="w-full" href={'/login/alternative' + page.url.search}
+					>Go back</Button
+				>
+				<Button class="w-full" type="submit" {isLoading}>Submit</Button>
+			</div>
+		</form>
+	{/if}
+</SignInWrapper>