test(routes): expand documents page coverage

Adds canWrite=false hides bulk-edit and new-doc CTAs, no-results
empty state, populated document list, q from server, render-without-
throwing for date / tag / sender filters preselected.

7 new tests targeting ~15 branches.

Refs #496.

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

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

@@ -112,4 +112,95 @@ describe('documents/+ page', () => {
 			.element(page.getByRole('button', { name: /alle .* editieren/i }))
 			.not.toBeInTheDocument();
 	});
+
+	it('hides the bulk-edit-all and new-doc CTAs when canWrite is false', async () => {
+		render(DocumentsListPage, {
+			props: { data: baseData({ canWrite: false, totalElements: 12 }) }
+		});
+
+		await expect
+			.element(page.getByRole('link', { name: /neues dokument/i }))
+			.not.toBeInTheDocument();
+		await expect.element(page.getByRole('button', { name: /alle 12/i })).not.toBeInTheDocument();
+	});
+
+	it('displays the no-results state when items is empty (via DocumentList)', async () => {
+		render(DocumentsListPage, { props: { data: baseData({ items: [], totalElements: 0 }) } });
+
+		// DocumentList renders the empty placeholder
+		expect(document.body.textContent).toMatch(/keine|noch|empty/i);
+	});
+
+	it('renders the document list when items are present', async () => {
+		render(DocumentsListPage, {
+			props: {
+				data: baseData({
+					items: [
+						{
+							document: {
+								id: 'd1',
+								title: 'Brief 1899',
+								status: 'TRANSCRIBED',
+								documentDate: '1899-04-14',
+								summary: '',
+								originalFilename: 'b1.pdf',
+								receivers: []
+							},
+							matchData: {
+								titleOffsets: [],
+								senderMatched: false,
+								matchedReceiverIds: [],
+								matchedTagIds: [],
+								snippetOffsets: [],
+								summaryOffsets: []
+							},
+							completionPercentage: 80,
+							contributors: []
+						}
+					],
+					totalElements: 1
+				})
+			}
+		});
+
+		expect(document.body.textContent).toContain('Brief 1899');
+	});
+
+	it('preselects the search input from data.q', async () => {
+		render(DocumentsListPage, { props: { data: baseData({ q: 'kurrent' }) } });
+
+		const input = document.querySelector('input[type="text"]') as HTMLInputElement;
+		expect(input?.value).toBe('kurrent');
+	});
+
+	it('renders without throwing when from/to date filters are preselected', async () => {
+		expect(() =>
+			render(DocumentsListPage, {
+				props: { data: baseData({ from: '1899-01-01', to: '1950-12-31' }) }
+			})
+		).not.toThrow();
+	});
+
+	it('renders without throwing when tag filters are preselected', async () => {
+		expect(() =>
+			render(DocumentsListPage, {
+				props: { data: baseData({ tags: ['Kurrent', 'Familie'] }) }
+			})
+		).not.toThrow();
+	});
+
+	it('renders without throwing when sender/receiver filters are set', async () => {
+		expect(() =>
+			render(DocumentsListPage, {
+				props: {
+					data: baseData({
+						senderId: 'p-1',
+						initialSenderName: 'Anna Schmidt',
+						receiverId: 'p-2',
+						initialReceiverName: 'Bert Meier'
+					})
+				}
+			})
+		).not.toThrow();
+	});
 });