Add native checkout close selector for RN E2E

[kyle-schellen]

What changed

Adds a stable native close-button selector for React Native Maestro E2E tests.

On Swift, the selector is set with accessibilityIdentifier on both close button paths: the default system close button and the custom-tinted close button. This keeps VoiceOver copy on the platform/localized path while giving E2E tests a deterministic hook.

On Android, the checkout toolbar close menu resource id is renamed from checkoutKitCloseBtn to shopify_checkout_kit_close_button so the shared React Native Maestro flow can target the same close selector on both native checkout surfaces.

The React Native iOS accelerated checkout wrapper diff in this PR is formatting-only around the existing SwiftUI environment injection; it does not add or change Apple Pay label/style behavior.

Verification

Added Swift test coverage for the close button identifier on both close button paths.

Updated Android CheckoutDialogTest references to verify the renamed close menu id still drives the existing close/cancel behavior and close icon configuration paths.

Ran:

• dev swift test
• dev android test specific CheckoutDialogTest

---

Before you merge

Important

• I've added tests to support my implementation
• I have read and agree with the Contribution Guidelines
• I have read and agree with the Code of Conduct
• I've updated the relevant platform README (platforms/swift/README.md and/or platforms/android/README.md)

---

Releasing a new Swift version?

• I have bumped the version in ShopifyCheckoutKit.podspec
• I have bumped the version in platforms/swift/Sources/ShopifyCheckoutKit/ShopifyCheckoutKit.swift
• I have updated platforms/swift/CHANGELOG.md
• I have updated the SwiftPM/CocoaPods version snippets in platforms/swift/README.md (major version only)

Releasing a new Android version?

• I have bumped the versionName in platforms/android/lib/build.gradle
• I have updated platforms/android/CHANGELOG.md
• I have updated the Gradle/Maven version snippets in platforms/android/README.md

Tip

See the Contributing documentation for the full release process per platform.

[kyle-schellen]

• Add focused rn e2e scenario flags #388
• Add RN hardcoded buyer identity maestro E2E #337
• Normalize RN E2E selector contract #336
• Wire RN E2E dev commands #335
• Add RN Maestro guest checkout subflows #334
• Add native checkout close selector for RN E2E  #333 👈 (View in Graphite)
• Add RN sample E2E bootstrap support #332
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[github-actions]

React Native — Coverage Report

Lines	Statements	Branches	Functions
	91.83% (326/355)	87.98% (183/208)	100% (86/86)

[github-actions]

Package Size

Platform	Artifact	Base	Head	Delta
React Native	npm tarball	91.6 KiB	91.6 KiB	+13 B
Android	release AAR	178.6 KiB	178.6 KiB	+22 B

Measured from the PR base SHA and PR head SHA. This comment reports package artifact sizes only; it is not a final app binary-size report.

[kyle-schellen]

Merge activity

• Jun 30, 4:14 PM UTC: A user started a stack merge that includes this pull request via Graphite.
• Jun 30, 4:16 PM UTC: Graphite rebased this pull request as part of a merge.
• Jun 30, 4:35 PM UTC: @kyle-schellen merged this pull request with Graphite.