test(picker): enable webkit tab navigation tests

[rise-erpelding]

Description

Removes !isWebKit() conditionals from two picker tests that were skipping tab key navigation validation in Safari/WebKit browsers. These conditionals were likely added because Safari's default tab behavior only focused form controls, not all interactive elements.

Changes:

• Removed if (!isWebKit()) wrapper from "closes when focusing away from the menu" test (line ~1088)
• Removed if (!isWebKit()) wrapper from similar tab navigation validation (line ~1125)
• Tab navigation validation now runs on all browsers including WebKit

Motivation and context

This addresses a reported accessibility issue where the Picker component could not be tabbed into in Safari within Storybook.

Investigation findings:

• On macOS 26.0.1 (Tahoe)/Safari, tab navigation to the Picker works by default without requiring accessibility settings changes
• On older macOS versions, tab navigation works when Safari's "Press Tab to highlight each item on a webpage" setting is enabled
• Playwright's 1.53.1 (using WebKit 18.5) appears to support proper tab navigation to all focusable elements by default
• The test skips were masking that this behavior already works correctly
• Since Safari/WebKit now properly supports tab navigation by default, these test workarounds are no longer necessary. Removing them improves test coverage and ensures consistent behavior validation across all browsers.

Related issue(s)

• fixes SWC-1081
• resolves [Bug]: Safari: Picker component cannot be tabbed into #5568

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Author's checklist

• I have read the CONTRIBUTING and PULL_REQUESTS documents.
• I have reviewed at the Accessibility Practices for this feature, see: Aria Practices
• I have added automated tests to cover my changes.
• I have included a well-written changeset if my change needs to be published.
• I have included updated documentation if my change required it.

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Reviewer's checklist

• Includes a Github Issue with appropriate flag or Jira ticket number without a link
• Includes thoughtfully written changeset if changes suggested include patch, minor, or major features
• Automated tests cover all use cases and follow best practices for writing
• Validated on all supported browsers
• All VRTs are approved before the author can update Golden Hash

Manual review test cases

• Verify picker tests pass locally:

  1. Run yarn test:focus picker
  2. Confirm all tests pass on Chromium, Firefox, and WebKit
  3. Expect no test failures, particularly in the "closes when focusing away from the menu" tests

• Confirm that bug cannot be replicated with appropriate settings on:

  1. Turn on keyboard accessibility settings:
     • System settings → Accessibility → Keyboard → Full Keyboard Access (on)
     • Safari settings → Advanced → Press Tab to highlight each item on a webpage (on)
  2. Navigate to the Picker Default story in Storybook
  3. From page load, begin tabbing until you reach the Storybook canvas (try to avoid using the mouse - clicking into the canvas may cause Safari to skip the Picker in tab order).
  4. Confirm that you are able to keyboard focus on the picker and its menu.

Device review

• Did it pass in Desktop?
• Did it pass in (emulated) Mobile?
• Did it pass in (emulated) iPad?

[changeset-bot]

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Latest commit: 6a2c9ea

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[github-actions]

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[coveralls]

Pull Request Test Coverage Report for Build 18852189534

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.001%) to 97.967%

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Totals
Change from base Build 18844771637:	0.001%
Covered Lines:	34259
Relevant Lines:	34788

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💛 - Coveralls

[github-actions]

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[caseyisonit]

out of curiosity, did you try removing the el.focus and see if that still passes? i believe that was the webkit work around but now that our keyboard helpers account for webkit weirdness we might be able to remove those.

[rise-erpelding]

As far as I can tell we need still need el.focus for the setup, when I took it out the tests timed out locally 😕

[caseyisonit]

LGTM