fix: snapshot RN synthetic events and prevent channel echo

[dannyhw]

Summary

• Adds patchChannelForRN which snapshots React Native synthetic event args synchronously before React recycles them back to the event pool
• Limits WebSocket channel serialization depth to 5 to prevent circular reference crashes from deep object graphs (React fiber nodes etc.)
• Stops the WebSocket server from echoing messages back to the sender, preventing duplicate event handling
• Fixes polyfill.ts import from react-native-web to react-native
• Moves setImmediate workaround from Start.tsx to polyfill.ts where it belongs

Problem

React Native still pools synthetic events (unlike React DOM 17+). When action events containing synthetic event args were serialized asynchronously by the channel transport, the events had already been returned to the pool — causing stale event warnings, serialization errors, or crashes from circular references in deep object graphs.

Additionally, the WebSocket server was broadcasting messages back to the sender, causing duplicate event processing.

Test plan

• Run the expo example on device
• Trigger actions (button presses, text input, etc.)
• Verify action events display clean data in the actions panel without warnings or crashes
• Verify actions don't double-trigger

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Latest commit: 36a89d3

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