test: cover register and admin/users/new page branches

register page (350 lines): hero render when no codeError, NO_INVITE_CODE
vs other-codeError card branches, form hidden when codeError set,
back-to-login link, form section rendering, prefill hydration of
firstName/lastName/email, prefill-hint visibility branch, hidden
code input with code-null fallback.

admin/users/new: heading, three card sections, group checkboxes
rendered, form-error banner branch, cancel link, submit button.

17 tests across two pages.

Refs #496.

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

frontend/src/routes/admin/users/new/page.svelte.test.ts

@@ -0,0 +1,74 @@
+import { describe, it, expect, vi, afterEach } from 'vitest';
+import { cleanup, render } from 'vitest-browser-svelte';
+import { page } from 'vitest/browser';
+
+vi.mock('$app/navigation', () => ({
+	beforeNavigate: () => {},
+	afterNavigate: () => {},
+	goto: vi.fn(),
+	invalidate: vi.fn(),
+	invalidateAll: vi.fn(),
+	preloadCode: vi.fn(),
+	preloadData: vi.fn(),
+	pushState: vi.fn(),
+	replaceState: vi.fn(),
+	disableScrollHandling: vi.fn(),
+	onNavigate: () => () => {}
+}));
+
+const { default: AdminUserNewPage } = await import('./+page.svelte');
+
+afterEach(cleanup);
+
+const baseData = (overrides: Record<string, unknown> = {}) => ({
+	groups: [
+		{ id: 'g1', name: 'Familie' },
+		{ id: 'g2', name: 'Admins' }
+	],
+	...overrides
+});
+
+describe('admin/users/new page', () => {
+	it('renders the new-user heading', async () => {
+		render(AdminUserNewPage, { props: { data: baseData(), form: undefined } });
+
+		await expect
+			.element(page.getByRole('heading', { name: /neuen benutzer anlegen/i }))
+			.toBeVisible();
+	});
+
+	it('renders the three card sections', async () => {
+		render(AdminUserNewPage, { props: { data: baseData(), form: undefined } });
+
+		await expect.element(page.getByRole('heading', { name: /persönliche daten/i })).toBeVisible();
+		await expect.element(page.getByRole('heading', { name: /^gruppen$/i })).toBeVisible();
+	});
+
+	it('renders all available groups in the picker', async () => {
+		render(AdminUserNewPage, { props: { data: baseData(), form: undefined } });
+
+		const checkboxes = document.querySelectorAll('input[name="groupIds"]');
+		expect(checkboxes.length).toBe(2);
+	});
+
+	it('shows the form-error banner when form.error is set', async () => {
+		render(AdminUserNewPage, {
+			props: { data: baseData(), form: { error: 'E-Mail bereits vergeben' } }
+		});
+
+		await expect.element(page.getByText('E-Mail bereits vergeben')).toBeVisible();
+	});
+
+	it('renders cancel link to /admin/users', async () => {
+		render(AdminUserNewPage, { props: { data: baseData(), form: undefined } });
+
+		const cancel = document.querySelectorAll('a[href="/admin/users"]');
+		expect(cancel.length).toBeGreaterThan(0);
+	});
+
+	it('renders the create submit button', async () => {
+		render(AdminUserNewPage, { props: { data: baseData(), form: undefined } });
+
+		await expect.element(page.getByRole('button', { name: /erstellen/i })).toBeVisible();
+	});
+});