fix: adjust playwright tests to new home-page button, and use 3 threads for fewer random failures

test-playwright/40-add-contact.spec.ts

@@ -117,7 +117,7 @@ test('Add contact, record gift, confirm gift', async ({ page }) => {
   // Confirm that home shows contact in "Record Something…"
   await page.goto('./');
   await page.getByTestId('closeOnboardingAndFinish').click();
-  await page.getByRole('button', { name: 'Person' }).click();
+  await page.getByRole('button', { name: 'Thank' }).click();
   await expect(page.locator('#sectionGiftedGiver').getByRole('listitem').filter({ hasText: contactName })).toBeVisible();
 
   // Record something given by new contact