test: cover UserPasswordSection and CorrespondenzFilterControls

UserPasswordSection: input rendering, type=password attribute,
required-prop propagation in both directions.

CorrespondenzFilterControls: dual date label rendering, both DateInput
ids, value hydration from fromDate/toDate, change-event smoke check.

Refs #496.

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

frontend/src/lib/user/UserPasswordSection.svelte.test.ts

@@ -0,0 +1,43 @@
+import { describe, it, expect, afterEach } from 'vitest';
+import { cleanup, render } from 'vitest-browser-svelte';
+import { page } from 'vitest/browser';
+import UserPasswordSection from './UserPasswordSection.svelte';
+
+afterEach(cleanup);
+
+describe('UserPasswordSection', () => {
+	it('renders both password labels', async () => {
+		render(UserPasswordSection, { props: {} });
+
+		await expect.element(page.getByLabelText('Neues Passwort (Wiederholung)')).toBeVisible();
+		const inputs = document.querySelectorAll('input[type="password"]');
+		expect(inputs.length).toBe(2);
+	});
+
+	it('exposes both inputs as type=password', async () => {
+		render(UserPasswordSection, { props: {} });
+
+		const newPwd = document.querySelector('input[name="newPassword"]') as HTMLInputElement;
+		const confirm = document.querySelector('input[name="confirmPassword"]') as HTMLInputElement;
+		expect(newPwd.type).toBe('password');
+		expect(confirm.type).toBe('password');
+	});
+
+	it('marks both inputs as required when required prop is true', async () => {
+		render(UserPasswordSection, { props: { required: true } });
+
+		const newPwd = document.querySelector('input[name="newPassword"]') as HTMLInputElement;
+		const confirm = document.querySelector('input[name="confirmPassword"]') as HTMLInputElement;
+		expect(newPwd.required).toBe(true);
+		expect(confirm.required).toBe(true);
+	});
+
+	it('leaves both inputs optional when required is false (default)', async () => {
+		render(UserPasswordSection, { props: {} });
+
+		const newPwd = document.querySelector('input[name="newPassword"]') as HTMLInputElement;
+		const confirm = document.querySelector('input[name="confirmPassword"]') as HTMLInputElement;
+		expect(newPwd.required).toBe(false);
+		expect(confirm.required).toBe(false);
+	});
+});