feat: add React Native New Architecture support (Turbo Modules + Fabric interop)

[mikemilla]

Fixes #35

Summary

Adds support for React Native New Architecture (Expo SDK 55 / RN 0.83+) where bridgeless mode is always enabled. The library now works through the Turbo Module and Fabric interop layers while maintaining backward compatibility with older RN versions.

Changes

JavaScript / TypeScript

• src/Modules.tsx: Native modules are now resolved through TurboModuleRegistry first, falling back to NativeModules for backward compatibility. This ensures modules are discoverable in both bridgeless (New Architecture) and bridge (Old Architecture) modes.

Android

• ReactNativeModule.kt: Replaced ReactActivity cast with direct Activity reference. In bridgeless mode, currentActivity may not be a ReactActivity, so casting to it would return null and break functionality.

• CourierClientModule.kt: Fixed a dangerous reactActivity!! force-unwrap in putUserToken(). Now uses reactApplicationContext for CourierDevice.current(), which is always available regardless of architecture mode.

• CourierSystemModule.kt: Updated all reactActivity references to use the safe activity accessor (returning Activity?). Permission requests and notification checks now work correctly in bridgeless mode.

• CourierPreferencesViewManager.kt: Fixed unsafe currentActivity as FragmentActivity cast that would crash in bridgeless mode. Now safely falls back to ThemedReactContext when FragmentActivity is unavailable.

• build.gradle:

  • Changed react-android dependency from hardcoded 0.73.7 to dynamic + so the consuming app's RN version is resolved automatically
  • Added safeExtGet helper so consuming apps can override SDK versions through rootProject.ext

• gradle.properties: Updated default SDK versions to compileSdk 34, targetSdk 34, minSdk 24, Kotlin 1.9.24 for compatibility with modern RN versions.

iOS

The iOS side already supports New Architecture through the interop layer:

• install_modules_dependencies in the podspec handles both architecture dependencies
• RCTEventEmitter and RCTViewManager subclasses work through Fabric/TurboModule interop automatically
• No code changes needed

Compatibility

RN Version	Architecture	Status
0.71 - 0.72	Old (bridge)	✅ Supported via NativeModules fallback
0.73 - 0.82	Old or New	✅ Supported via interop layer + TurboModuleRegistry
0.83+	New (always)	✅ Supported via TurboModuleRegistry + interop

Testing

• All 125 existing Jest tests pass
• TypeScript type checking passes (no new errors)
• ESLint passes (no new warnings or errors)