test: cover login and persons/[id] page branches

login: form rendering, registered-success banner branch, form-error
banner branch, form-action wiring, email/password input attributes,
forgot-password link.

persons/[id]: PersonCard heading via prop pass-through, document section
headings, empty-message branches, GeschichtenCard hidden when empty,
co-correspondents derived from sent documents, canWrite gating the edit
link.

14 tests across two large pages.

Refs #496.

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

frontend/src/routes/login/page.svelte.test.ts

@@ -0,0 +1,73 @@
+import { describe, it, expect, afterEach } from 'vitest';
+import { cleanup, render } from 'vitest-browser-svelte';
+import { page } from 'vitest/browser';
+import LoginPage from './+page.svelte';
+
+afterEach(cleanup);
+
+describe('login page', () => {
+	it('renders the login form by default', async () => {
+		render(LoginPage, { props: { data: { registered: false }, form: undefined } });
+
+		await expect.element(page.getByRole('heading', { name: /^anmelden$/i })).toBeVisible();
+		await expect.element(page.getByLabelText(/e-mail-adresse/i)).toBeVisible();
+		await expect.element(page.getByLabelText(/passwort/i)).toBeVisible();
+		await expect.element(page.getByRole('button', { name: /^anmelden$/i })).toBeVisible();
+	});
+
+	it('shows the registered-success banner when data.registered is true', async () => {
+		render(LoginPage, { props: { data: { registered: true }, form: undefined } });
+
+		await expect
+			.element(page.getByText('Dein Konto wurde erfolgreich erstellt. Melde dich jetzt an.'))
+			.toBeVisible();
+	});
+
+	it('hides the registered-success banner when data.registered is false', async () => {
+		render(LoginPage, { props: { data: { registered: false }, form: undefined } });
+
+		await expect.element(page.getByRole('status')).not.toBeInTheDocument();
+	});
+
+	it('shows the form error when form.error is set', async () => {
+		render(LoginPage, {
+			props: { data: { registered: false }, form: { error: 'Ungültige Anmeldedaten' } }
+		});
+
+		await expect.element(page.getByText('Ungültige Anmeldedaten')).toBeVisible();
+	});
+
+	it('declares POST as the form method and routes to ?/login', async () => {
+		render(LoginPage, { props: { data: { registered: false }, form: undefined } });
+
+		const form = document.querySelector('form');
+		expect(form?.getAttribute('method')).toBe('POST');
+		expect(form?.getAttribute('action')).toBe('?/login');
+	});
+
+	it('exposes the email input as type=email and required', async () => {
+		render(LoginPage, { props: { data: { registered: false }, form: undefined } });
+
+		const email = document.querySelector('input[name="email"]') as HTMLInputElement;
+		expect(email.type).toBe('email');
+		expect(email.required).toBe(true);
+		expect(email.autocomplete).toBe('email');
+	});
+
+	it('exposes the password input as type=password and required', async () => {
+		render(LoginPage, { props: { data: { registered: false }, form: undefined } });
+
+		const pwd = document.querySelector('input[name="password"]') as HTMLInputElement;
+		expect(pwd.type).toBe('password');
+		expect(pwd.required).toBe(true);
+		expect(pwd.autocomplete).toBe('current-password');
+	});
+
+	it('renders the forgot-password link', async () => {
+		render(LoginPage, { props: { data: { registered: false }, form: undefined } });
+
+		await expect
+			.element(page.getByRole('link', { name: /passwort vergessen/i }))
+			.toHaveAttribute('href', '/forgot-password');
+	});
+});