feat!: bump to v4.0.0 (New Architecture Release)

[kieran-osgood-shopify]

v4.0.0 — React Native New Architecture

v4 is a breaking release. The library now requires the React Native
New Architecture (TurboModules + Fabric) and no longer supports the
legacy bridge. Apps that are still on the old architecture should stay
on the 3.x line.

Changelog

Breaking changes

New Architecture is now required.

• Consumers must have newArchEnabled=true on Android and
  :new_arch_enabled => true in the iOS Podfile.
• See the React Native upgrade guide for migration help:
  https://reactnative.dev/docs/the-new-architecture/use-the-new-architecture

Several promise-returning APIs are now synchronous. Drop await
from call sites:

API	Before	After
getConfig()	Promise<Configuration>	Configuration
setConfig(config)	Promise<void>	void
configureAcceleratedCheckouts(config)	Promise<boolean>	boolean
isAcceleratedCheckoutAvailable()	Promise<boolean>	boolean
isApplePayAvailable()	Promise<boolean>	boolean

- const config = await shopify.getConfig();
+ const config = shopify.getConfig();

- await shopify.setConfig({preloading: true});
+ shopify.setConfig({preloading: true});

- const available = await shopify.isAcceleratedCheckoutAvailable();
+ const available = shopify.isAcceleratedCheckoutAvailable();

Under the hood

• Native modules migrated from legacy bridge (RCT_EXTERN_MODULE / ReactPackage) to TurboModules (NativeShopifyCheckoutSheetKitSpecBase on iOS, TurboReactPackage on Android).
• Old-architecture conditional code paths removed from RNShopifyCheckoutSheetKit.podspec and Android build.gradle.
• AcceleratedCheckoutButtons now registered via codegenNativeComponent.
• Added runtime coercion for colorScheme / logLevel values returned by getConfig() — unknown values from native now fall back to safe defaults (automatic / error) rather than silently passing through as untyped strings.

Migration checklist

• Enable New Architecture in your app (see React Native docs)
• Remove await from the five APIs listed above
• Reinstall pods: cd ios && bundle exec pod install

[kieran-osgood-shopify]

• Rename Checkout Sheet Kit to Checkout Kit (React Native) #483
• feat!: bump to v4.0.0 (New Architecture Release) #467 👈 (View in Graphite)
• Remove New Arch interop checks - New Arch only #456
• Add TurboModule specs and codegen components to prepare RN new-arch migration #449
• fix: pin react-native-quick-crypto to 1.0.9 #480
• main

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[kieran-osgood-shopify]

Merge activity

• May 6, 7:17 PM UTC: A user started a stack merge that includes this pull request via Graphite.
• May 6, 7:50 PM UTC: Graphite couldn't merge this pull request because a downstack PR Remove New Arch interop checks - New Arch only #456 failed to merge.
• May 6, 8:46 PM UTC: Graphite couldn't merge this PR because it failed for an unknown reason (GitHub is reporting that this PR is not mergeable, despite passing required status checks defined by your branch protection rules. Please check your rulesets for additional blocking criteria. Graphite Merge Queue does not currently support rulesets. Please contact Graphite support for further assistance.).