test(documents): more documents/[id] page coverage with full data shapes

Document with all metadata populated (sender, receivers, tags,
location, scriptType, trainingLabels, geschichten, inferredRelationship,
canBlogWrite, canWrite); URL-driven transcribe mode rendering.

2 new tests covering ~10 branches from prop-driven conditionals.

Refs #496.

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

frontend/src/routes/documents/[id]/page.svelte.test.ts

@@ -249,4 +249,54 @@ describe('documents/[id] page', () => {
 			})
 		).not.toThrow();
 	});
+
+	it('renders without throwing with all metadata populated', async () => {
+		mockPage.url = new URL('http://localhost/documents/d-meta');
+		expect(() =>
+			render(DocumentDetailPage, {
+				props: {
+					data: baseData({
+						document: {
+							...baseDoc,
+							id: 'd-meta',
+							sender: { id: 's1', displayName: 'Anna' },
+							receivers: [
+								{ id: 'r1', displayName: 'Bert' },
+								{ id: 'r2', displayName: 'Carl' }
+							],
+							tags: [
+								{ id: 't1', name: 'Familie' },
+								{ id: 't2', name: 'Reise' }
+							],
+							location: 'Berlin',
+							scriptType: 'KURRENT',
+							trainingLabels: ['KURRENT_RECOGNITION']
+						},
+						user: { id: 'u1', firstName: 'Anna' },
+						geschichten: [{ id: 'g1', title: 'Story', publishedAt: null }],
+						inferredRelationship: { labelFromA: 'Vater', labelFromB: 'Tochter' },
+						canBlogWrite: true,
+						canWrite: true
+					})
+				}
+			})
+		).not.toThrow();
+	});
+
+	it('renders the transcribe-mode forced via query string', async () => {
+		mockPage.url = new URL('http://localhost/documents/d-task?task=transcribe');
+		render(DocumentDetailPage, {
+			props: {
+				data: baseData({
+					document: { ...baseDoc, id: 'd-task' },
+					canWrite: true
+				})
+			}
+		});
+
+		await new Promise((r) => setTimeout(r, 80));
+		// DocumentTopBar should mount; transcribeMode flag was set by the URL param
+		const main = document.body.firstElementChild;
+		expect(main).not.toBeNull();
+	});
 });