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]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• 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]

This is removed in the upstack pnpm -> yarn migration - added to avoid having to move that migration in front of the new arch work