fix(partysocket): add React Native environment detection for dispatchEvent

[amondnet]

Summary

Fixes #257

React Native/Expo users experience TypeError: Failed to execute 'dispatchEvent' on 'EventTarget': parameter 1 is not of type 'Event' when using partysocket.

Root Cause

The environment detection logic incorrectly identifies React Native as a browser environment because:

• React Native has both process and document polyfilled
• But lacks process.versions.node
• This caused isNode = false, selecting browser-style event cloning
• Browser-style cloning produces events that fail instanceof Event checks in event-target-polyfill

Solution

Added explicit React Native environment detection using the standard navigator.product === "ReactNative" check:

const isReactNative =
  typeof navigator !== "undefined" && navigator.product === "ReactNative";

const cloneEvent = isNode || isReactNative ? cloneEventNode : cloneEventBrowser;

Changes

• packages/partysocket/src/ws.ts - Added React Native environment detection
• packages/partysocket/src/tests/react-native.test.ts - Added test coverage

Test Plan

• All existing tests pass (45 tests)
• Added 5 new tests for React Native environment detection
• Linting passes (Biome, Prettier)

[changeset-bot]

🦋 Changeset detected

Latest commit: f5851a9

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
partysocket	Patch

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[Sillyvan]

@threepointone really dont want to be annoying but this PR would be amazing for us React Native users! Thanks

[threepointone]

Ok promise I'll look at it this week

[threepointone]

this is very nice, thank you.