feat(onboarding): add A2 household setup page with responsive progress sidebar layout

Desktop: 300px ProgressSidebar (step 1 active) + flex form area.
Mobile: "Schritt 1 von 3" eyebrow + HouseholdSetupForm.
Also stubs /household/staples as redirect target for A3.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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

@@ -0,0 +1,42 @@
+<script lang="ts">
+	import ProgressSidebar from '$lib/components/ProgressSidebar.svelte';
+	import HouseholdSetupForm from '$lib/onboarding/HouseholdSetupForm.svelte';
+
+	type FormResult = {
+		errors?: Record<string, string>;
+		name?: string;
+	} | null;
+
+	let { form = null }: { form?: FormResult } = $props();
+</script>
+
+<svelte:head>
+	<title>Haushalt einrichten — Mealplan</title>
+</svelte:head>
+
+<div class="flex min-h-screen bg-[var(--color-page)]">
+	<!-- Desktop progress sidebar — hidden on mobile -->
+	<aside
+		class="hidden md:flex w-[300px] flex-shrink-0 flex-col bg-[var(--color-surface)] border-r border-[var(--color-border)] p-[40px_28px]"
+		aria-hidden="true"
+	>
+		<ProgressSidebar currentStep={1} />
+	</aside>
+
+	<!-- Form area -->
+	<main class="flex flex-1 flex-col justify-center">
+		<!-- Mobile: step indicator (visible only on mobile) -->
+		<div class="md:hidden px-[20px] pt-[24px] pb-[0]">
+			<p class="text-[10px] font-medium tracking-[.08em] uppercase text-[var(--color-text-muted)]">
+				Schritt 1 von 3
+			</p>
+		</div>
+
+		<!-- Form -->
+		<div class="px-[20px] py-[24px] md:px-[56px] md:py-[48px]">
+			<div class="max-w-[420px]">
+				<HouseholdSetupForm {form} />
+			</div>
+		</div>
+	</main>
+</div>

frontend/src/routes/household/setup/page.test.ts

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+import { describe, it, expect, vi } from 'vitest';
+import { render, screen } from '@testing-library/svelte';
+import Page from './+page.svelte';
+
+vi.mock('$app/forms', () => ({
+	enhance: () => ({ destroy: () => {} })
+}));
+
+describe('household setup page', () => {
+	it('renders the form heading', () => {
+		render(Page);
+		expect(screen.getByText('Haushalt benennen')).toBeInTheDocument();
+	});
+
+	it('renders the household name input', () => {
+		render(Page);
+		expect(screen.getByLabelText('Haushaltsname')).toBeInTheDocument();
+	});
+
+	it('renders the continue button', () => {
+		render(Page);
+		expect(screen.getByRole('button', { name: /weiter/i })).toBeInTheDocument();
+	});
+
+	it('renders the ProgressSidebar with step 1 active', () => {
+		render(Page);
+		const step1 = screen.getByTestId('step-1');
+		expect(step1).toHaveAttribute('aria-current', 'step');
+	});
+
+	it('renders steps 2 and 3 as future steps', () => {
+		render(Page);
+		expect(screen.getByTestId('step-2')).not.toHaveAttribute('aria-current');
+		expect(screen.getByTestId('step-3')).not.toHaveAttribute('aria-current');
+	});
+
+	it('does not render app navigation chrome', () => {
+		render(Page);
+		// No nav links like Planer or Rezepte (those are app shell nav items)
+		expect(screen.queryByText('Planer')).not.toBeInTheDocument();
+		expect(screen.queryByText('Rezepte')).not.toBeInTheDocument();
+	});
+
+	it('sets the page title', () => {
+		render(Page);
+		expect(document.title).toBe('Haushalt einrichten — Mealplan');
+	});
+
+	it('renders the mobile step indicator text', () => {
+		render(Page);
+		expect(screen.getByText(/schritt 1 von 3/i)).toBeInTheDocument();
+	});
+});

frontend/src/routes/household/staples/+page.svelte

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+<svelte:head>
+	<title>Vorräte einrichten — Mealplan</title>
+</svelte:head>
+
+<div class="flex min-h-screen items-center justify-center bg-[var(--color-page)]">
+	<p class="text-[var(--color-text-muted)]">A3 — Vorräte einrichten (coming soon)</p>
+</div>

frontend/src/test-setup.ts

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+import '@testing-library/jest-dom/vitest';
+import { configure } from '@testing-library/dom';
+
+// Exclude elements inside aria-hidden containers from text queries,
+// so that visually-hidden sidebars (e.g. ProgressSidebar in onboarding pages)
+// don't create duplicate text matches when the same text appears in the main content.
+configure({ defaultIgnore: 'script, style, [aria-hidden="true"] *' });