fix(perps): add CloseEvent polyfill for hyperliquid SDK WebSocket transport

@nktkas/rews v2 (dependency of @nktkas/hyperliquid 0.32.2) uses
`new CloseEvent(...)` which is not available in React Native/Hermes.
This caused the WebSocket transport to crash on initialization,
preventing perps from loading in E2E tests.

Author: abretonc7s

shim.js

@@ -130,6 +130,19 @@ if (typeof global.CustomEvent === 'undefined') {
   };
 }
 
+// CloseEvent polyfill for @nktkas/rews v2 (used by Hyperliquid SDK WebSocket transport)
+// React Native/Hermes does not provide CloseEvent as a global constructor
+if (typeof global.CloseEvent === 'undefined') {
+  global.CloseEvent = function (type, params) {
+    params = params || {};
+    const event = new global.Event(type, params);
+    event.code = params.code || 0;
+    event.reason = params.reason || '';
+    event.wasClean = params.wasClean || false;
+    return event;
+  };
+}
+
 class AbortError extends Error {
   constructor(message) {
     super(message);