test: cover DocumentViewer, PersonalInfoForm, profile page

DocumentViewer: loading / error / no-scan / image rendering branches.
filePath conditionally drives the direct-download link in the error
state; fileUrl + non-PDF contentType drives the <img> render.

PersonalInfoForm: default render, prop hydration including the German
date conversion path, success/error banner branches, form action wiring.

profile/+page: notification-checkbox enabled/disabled depending on
hasEmail, no-email hint visibility, prefsSuccess/prefsError banners,
fallback when notificationPrefs is null.

20 tests across three files.

Refs #496.

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

frontend/src/lib/document/DocumentViewer.svelte.test.ts

@@ -0,0 +1,75 @@
+import { describe, it, expect, afterEach } from 'vitest';
+import { cleanup, render } from 'vitest-browser-svelte';
+import { page } from 'vitest/browser';
+import DocumentViewer from './DocumentViewer.svelte';
+
+afterEach(cleanup);
+
+const baseProps = {
+	doc: { id: 'd1', filePath: null, contentType: null, fileHash: null },
+	fileUrl: '',
+	isLoading: false,
+	error: '',
+	transcribeMode: false,
+	blockNumbers: {},
+	annotationReloadKey: 0,
+	activeAnnotationId: null,
+	annotationsDimmed: false,
+	flashAnnotationId: null,
+	onAnnotationClick: () => {}
+};
+
+describe('DocumentViewer', () => {
+	it('renders the loading spinner and label when isLoading is true', async () => {
+		render(DocumentViewer, { props: { ...baseProps, isLoading: true } });
+
+		await expect.element(page.getByText('Lade Dokument...')).toBeVisible();
+	});
+
+	it('renders the error message when error is set', async () => {
+		render(DocumentViewer, { props: { ...baseProps, error: 'Datei nicht verfügbar' } });
+
+		await expect.element(page.getByText('Datei nicht verfügbar')).toBeVisible();
+	});
+
+	it('shows the direct-download link in the error state when filePath is present', async () => {
+		render(DocumentViewer, {
+			props: {
+				...baseProps,
+				doc: { ...baseProps.doc, filePath: 'docs/scan.pdf' },
+				error: 'Render failed'
+			}
+		});
+
+		await expect
+			.element(page.getByRole('link', { name: /direkter download/i }))
+			.toHaveAttribute('href', '/api/documents/d1/file');
+	});
+
+	it('omits the direct-download link in the error state when filePath is null', async () => {
+		render(DocumentViewer, { props: { ...baseProps, error: 'Render failed' } });
+
+		await expect
+			.element(page.getByRole('link', { name: /direkter download/i }))
+			.not.toBeInTheDocument();
+	});
+
+	it('renders the no-scan placeholder when filePath is null and there is no error', async () => {
+		render(DocumentViewer, { props: baseProps });
+
+		await expect.element(page.getByText('Kein Scan vorhanden')).toBeVisible();
+	});
+
+	it('renders an <img> for non-PDF content types when fileUrl is present', async () => {
+		render(DocumentViewer, {
+			props: {
+				...baseProps,
+				doc: { ...baseProps.doc, filePath: 'docs/x.jpg', contentType: 'image/jpeg' },
+				fileUrl: '/api/documents/d1/file'
+			}
+		});
+
+		const img = await page.getByRole('img', { name: /original-scan/i }).element();
+		expect(img.getAttribute('src')).toBe('/api/documents/d1/file');
+	});
+});