refactor: move document domain core to lib/document/

Moves ~25 components, utils (search, filename, groupDocuments,
documentStatusLabel, validateFile), bulkSelection store, and
TranscriptionSection sub-component. Fixes broken relative imports.

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

frontend/src/lib/document/DocumentMetadataDrawer.svelte.spec.ts

@@ -0,0 +1,119 @@
+import { describe, it, expect, afterEach } from 'vitest';
+import { cleanup, render } from 'vitest-browser-svelte';
+import { page } from 'vitest/browser';
+import DocumentMetadataDrawer from './DocumentMetadataDrawer.svelte';
+
+afterEach(cleanup);
+
+const sender = { id: 's1', firstName: 'Karl', lastName: 'Müller', displayName: 'Karl Müller' };
+const receivers = [
+	{ id: 'r1', firstName: 'Anna', lastName: 'Schmidt', displayName: 'Anna Schmidt' },
+	{ id: 'r2', firstName: 'Hans', lastName: 'Weber', displayName: 'Hans Weber' }
+];
+const tags = [
+	{ id: 't1', name: 'Familienbrief' },
+	{ id: 't2', name: 'Kriegszeit' }
+];
+
+function renderDrawer(overrides: Record<string, unknown> = {}) {
+	return render(DocumentMetadataDrawer, {
+		documentDate: '1942-03-15',
+		location: 'Berlin',
+		status: 'UPLOADED',
+		sender,
+		receivers,
+		tags,
+		...overrides
+	});
+}
+
+// ─── Details column ──────────────────────────────────────────────────────────
+
+describe('DocumentMetadataDrawer — details column', () => {
+	it('renders formatted date', async () => {
+		renderDrawer();
+		await expect.element(page.getByText('15. März 1942')).toBeInTheDocument();
+	});
+
+	it('renders dash when date is null', async () => {
+		renderDrawer({ documentDate: null });
+		const dds = page.getByText('—');
+		await expect.element(dds.first()).toBeInTheDocument();
+	});
+
+	it('renders location', async () => {
+		renderDrawer();
+		await expect.element(page.getByText('Berlin')).toBeInTheDocument();
+	});
+
+	it('renders dash when location is null', async () => {
+		renderDrawer({ location: null });
+		const dashes = page.getByText('—');
+		await expect.element(dashes.first()).toBeInTheDocument();
+	});
+
+	it('renders translated status label', async () => {
+		renderDrawer();
+		// "Hochgeladen" is the German translation of UPLOADED
+		await expect.element(page.getByText('Hochgeladen')).toBeInTheDocument();
+	});
+});
+
+// ─── Persons column ──────────────────────────────────────────────────────────
+
+describe('DocumentMetadataDrawer — persons column', () => {
+	it('renders sender name as link to person detail', async () => {
+		renderDrawer();
+		const link = page.getByRole('link', { name: /Karl Müller/ });
+		await expect.element(link).toBeInTheDocument();
+		await expect.element(link).toHaveAttribute('href', '/persons/s1');
+	});
+
+	it('renders receiver names as links', async () => {
+		renderDrawer();
+		const anna = page.getByRole('link', { name: /Anna Schmidt/ });
+		await expect.element(anna).toHaveAttribute('href', '/persons/r1');
+		const hans = page.getByRole('link', { name: /Hans Weber/ });
+		await expect.element(hans).toHaveAttribute('href', '/persons/r2');
+	});
+
+	it('shows empty state when no sender and no receivers', async () => {
+		renderDrawer({ sender: null, receivers: [] });
+		await expect.element(page.getByText('Keine Personen zugeordnet')).toBeInTheDocument();
+	});
+
+	it('renders inferred relationship pills inline next to sender and receiver', async () => {
+		renderDrawer({
+			receivers: [receivers[0]],
+			inferredRelationship: { labelFromA: 'Elternteil', labelFromB: 'Kind' }
+		});
+
+		// Sender link contains its pill, receiver link contains its pill.
+		const senderLink = page.getByRole('link', { name: /Karl Müller.*Elternteil/i });
+		await expect.element(senderLink).toBeInTheDocument();
+		const receiverLink = page.getByRole('link', { name: /Anna Schmidt.*Kind/i });
+		await expect.element(receiverLink).toBeInTheDocument();
+	});
+
+	it('omits the pills when no inferred relationship is provided', async () => {
+		renderDrawer();
+		const elternteil = page.getByText('Elternteil');
+		expect(await elternteil.elements()).toHaveLength(0);
+	});
+});
+
+// ─── Tags column ─────────────────────────────────────────────────────────────
+
+describe('DocumentMetadataDrawer — tags column', () => {
+	it('renders tag chips as links', async () => {
+		renderDrawer();
+		const fb = page.getByRole('link', { name: 'Familienbrief' });
+		await expect.element(fb).toBeInTheDocument();
+		await expect.element(fb).toHaveAttribute('href', '/?tag=Familienbrief');
+	});
+
+	it('shows empty state when no tags', async () => {
+		renderDrawer({ tags: [] });
+		await expect.element(page.getByText('Keine Schlagwörter zugeordnet')).toBeInTheDocument();
+	});
+});