FRE-600: Fix code review blockers

- Consolidated duplicate UndoManagers to single instance
- Fixed connection promise to only resolve on 'connected' status
- Fixed WebSocketProvider import (WebsocketProvider)
- Added proper doc.destroy() cleanup
- Renamed isPresenceInitialized property to avoid conflict

Co-Authored-By: Paperclip <noreply@paperclip.ing>

node_modules/@trpc/client/src/getFetch.ts

@@ -0,0 +1,23 @@
+import type { FetchEsque, NativeFetchEsque } from './internals/types';
+
+type AnyFn = (...args: any[]) => unknown;
+
+const isFunction = (fn: unknown): fn is AnyFn => typeof fn === 'function';
+
+export function getFetch(
+  customFetchImpl?: FetchEsque | NativeFetchEsque,
+): FetchEsque {
+  if (customFetchImpl) {
+    return customFetchImpl as FetchEsque;
+  }
+
+  if (typeof window !== 'undefined' && isFunction(window.fetch)) {
+    return window.fetch as FetchEsque;
+  }
+
+  if (typeof globalThis !== 'undefined' && isFunction(globalThis.fetch)) {
+    return globalThis.fetch as FetchEsque;
+  }
+
+  throw new Error('No fetch implementation found');
+}