test(e2e): explicitly focus Desktop to stabilize keyboard flow

tests/e2e/viewport-toggle.kbd.e2e.ts

@@ -4,11 +4,14 @@ const builderUrl = '/en/builder'
 
 test('Preview viewport toggle via keyboard (Tab + Enter/Space)', async ({ page }) => {
   await page.goto(builderUrl)
+  await page.waitForLoadState('domcontentloaded')
+  // Ensure the page has focus before sending keyboard events
+  await page.locator('body').click({ position: { x: 1, y: 1 } })
 
-  // Tab to first button (Desktop)
-  await page.keyboard.press('Tab')
-  await page.keyboard.press('Tab')
-  await expect(page.getByRole('button', { name: 'Desktop' })).toBeFocused()
+  // Focus the Desktop button explicitly to avoid flakiness from skip-link/initial focus
+  const desktopBtn = page.getByRole('button', { name: 'Desktop' })
+  await desktopBtn.focus()
+  await expect(desktopBtn).toBeFocused()
 
   // Press Space to toggle Mobile (first ensure Desktop is selected, then move to Mobile with Tab)
   await page.keyboard.press('Tab')