test(e2e): uniquify person-mention doc title and tighten B21 card-suppression assertion

- Sara #3: title was a fixed string; if beforeAll crashed before afterAll
  ran, the next run would collide. Append Date.now() so each run has a
  unique title.
- Sara #2: B21 only asserted "no card present after tap" — but at that
  point we've already navigated to /persons/{id} and the card lives on
  the document page, so the assertion was vacuous. Move the toHaveCount(0)
  to before the tap so it actually proves touch-device suppression.

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

frontend/e2e/person-mention-read.spec.ts

@@ -44,8 +44,14 @@ test.describe('Person mention — read mode', () => {
 		personId = person.id;
 
 		// 2. Document with a PDF so the transcription panel is mountable.
+		// Sara #3: timestamp the title so a previous run that crashed in beforeAll
+		// (and therefore skipped afterAll cleanup) cannot collide with this one.
+		const uniqueSuffix = Date.now();
 		const docRes = await request.post('/api/documents', {
-			multipart: { title: 'E2E Person Mention Read', documentDate: '1945-05-08' }
+			multipart: {
+				title: `E2E Person Mention Read ${uniqueSuffix}`,
+				documentDate: '1945-05-08'
+			}
 		});
 		if (!docRes.ok()) throw new Error(`Create document failed: ${docRes.status()}`);
 		const doc = await docRes.json();
@@ -54,7 +60,7 @@ test.describe('Person mention — read mode', () => {
 
 		await request.put(`/api/documents/${docId}`, {
 			multipart: {
-				title: doc.title,
+				title: doc.title as string,
 				documentDate: '1945-05-08',
 				file: {
 					name: 'minimal.pdf',
@@ -143,10 +149,13 @@ test.describe('Person mention — read mode', () => {
 			const link = touchPage.locator(`a.person-mention[data-person-id="${personId}"]`).first();
 			await expect(link).toBeVisible({ timeout: 5000 });
 
-			await link.tap();
-			// The card never mounted — the tap navigated directly per spec
-			await expect(touchPage).toHaveURL(new RegExp(`/persons/${personId}`));
+			// Sara #2: assert no card *before* the tap so the test actually proves
+			// the touch device suppression worked, not just that we navigated away.
 			await expect(touchPage.getByTestId('person-hover-card')).toHaveCount(0);
+
+			await link.tap();
+			// The card never mounted — the tap navigated directly per spec.
+			await expect(touchPage).toHaveURL(new RegExp(`/persons/${personId}`));
 		} finally {
 			await context.close();
 		}