fix: prove resilient keyboard and no-script paths

tests/browser/keyboard.spec.ts

@@ -78,6 +78,25 @@ test('tabs from the skip link through navigation and every contact action', asyn
   }
 });
 
+test('activating the skip link focuses the visible unobscured portfolio content', async ({
+  page,
+  distUrl,
+}) => {
+  await page.goto(distUrl, { waitUntil: 'domcontentloaded' });
+  await page.keyboard.press('Tab');
+  await expect(page.locator('.skip-link')).toBeFocused();
+
+  await page.keyboard.press('Enter');
+
+  await expect(page).toHaveURL(`${distUrl}/#portfolio-content`);
+  await expect(page.locator('#portfolio-content')).toBeFocused();
+  await expect(page.locator('#portfolio-content')).toHaveAttribute(
+    'tabindex',
+    '-1',
+  );
+  await assertVisibleUnobscuredFocus(page);
+});
+
 test('explicit section activation scrolls to and focuses its heading', async ({
   page,
   distUrl,