fix: [SDK-4346] resolve strict CodeGen rules preventing RN/Expo apps from building

[fadi-george]

One Line Summary

Fix EventEmitter import path in NativeOneSignal.ts so React Native CodeGen doesn't fail for New Architecture builds on RN 0.76+.

See error:

> Task :react-native-onesignal:generateCodegenSchemaFromJavaScript FAILED
/Users/fadigeorge/Documents/Code/SDK/react-native-onesignal/examples/demo2/node_modules/@react-native/codegen/lib/parsers/parsers-commons.js:663
        throw parsingErrors[0];
        ^

UnsupportedModulePropertyParserError: Module NativeOneSignal: TypeScript interfaces extending TurboModule must only contain 'FunctionTypeAnnotation's or non nullable 'EventEmitter's. Property 'onPermissionChanged' refers to a 'TSTypeReference'.

Motivation

React Native 0.76+ with New Architecture enabled uses stricter CodeGen module resolution. The previous CodegenTypes.EventEmitter import from react-native doesn't resolve correctly under these stricter rules, causing a CodeGen error that prevents the app from building entirely.

This affects any RN 0.76+ or Expo user with New Architecture enabled. Importing EventEmitter directly from react-native/Libraries/Types/CodegenTypes fixes the resolution and allows CodeGen to process the TurboModule spec successfully.

Linear: SDK-4346

Scope

• src/NativeOneSignal.ts -- changed EventEmitter import from CodegenTypes.EventEmitter (via react-native) to a direct import from react-native/Libraries/Types/CodegenTypes. This resolves the CodeGen failure for New Architecture builds on RN 0.76+.
• examples/run-android.sh / examples/run-ios.sh -- removed stale cd into demo directory (unrelated cleanup)

Testing

• Build the example app with New Architecture enabled on RN 0.76+ (npx expo run:ios) and confirm CodeGen no longer errors
• Verify push notifications still fire event callbacks at runtime

Affected code checklist

• TypeScript source (TurboModule spec)
• Example app helper scripts
• Native Android
• Native iOS
• Tests/CI

Checklist

• Followed repo coding conventions
• Changes are limited to what's described above
• No secrets or credentials included