feat: improve initial admin creation workflow

frontend/src/routes/signup/setup/+page.svelte

@@ -0,0 +1,70 @@
+<script lang="ts">
+	import { goto } from '$app/navigation';
+	import SignInWrapper from '$lib/components/login-wrapper.svelte';
+	import SignupForm from '$lib/components/signup/signup-form.svelte';
+	import { Button } from '$lib/components/ui/button';
+	import { m } from '$lib/paraglide/messages';
+	import UserService from '$lib/services/user-service';
+	import appConfigStore from '$lib/stores/application-configuration-store';
+	import userStore from '$lib/stores/user-store';
+	import type { UserSignUp } from '$lib/types/user.type';
+	import { getAxiosErrorMessage } from '$lib/utils/error-util';
+	import { tryCatch } from '$lib/utils/try-catch-util';
+	import { fade } from 'svelte/transition';
+	import LoginLogoErrorSuccessIndicator from '../../login/components/login-logo-error-success-indicator.svelte';
+
+	let { data } = $props();
+	const userService = new UserService();
+
+	let isLoading = $state(false);
+	let error: string | undefined = $state();
+
+	async function handleSignup(userData: UserSignUp) {
+		isLoading = true;
+
+		const result = await tryCatch(userService.signupInitialUser(userData));
+
+		if (result.error) {
+			error = getAxiosErrorMessage(result.error);
+			isLoading = false;
+			return false;
+		}
+
+		userStore.setUser(result.data);
+		isLoading = false;
+
+		goto('/signup/add-passkey');
+		return true;
+	}
+</script>
+
+<svelte:head>
+	<title>{m.signup()}</title>
+</svelte:head>
+
+<SignInWrapper animate={!$appConfigStore.disableAnimations}>
+	<div class="flex justify-center">
+		<LoginLogoErrorSuccessIndicator error={!!error} />
+	</div>
+
+	<h1 class="font-playfair mt-5 text-3xl font-bold sm:text-4xl">
+		{m.signup_to_appname({ appName: $appConfigStore.appName })}
+	</h1>
+
+	{#if !error}
+		<p class="text-muted-foreground mt-2" in:fade>
+			{m.initial_account_creation_description()}
+		</p>
+	{:else}
+		<p class="text-muted-foreground mt-2" in:fade>
+			{error}.
+		</p>
+	{/if}
+
+	<SignupForm callback={handleSignup} {isLoading} />
+	<div class="mt-10 flex w-full justify-end">
+		<Button type="submit" form="sign-up-form" onclick={() => (error = undefined)}
+			>{m.signup()}</Button
+		>
+	</div>
+</SignInWrapper>