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/isows/native.ts

@@ -0,0 +1,6 @@
+import { getNativeWebSocket } from "./utils.js";
+
+export const WebSocket = getNativeWebSocket();
+
+type MessageEvent_ = MessageEvent;
+export type { MessageEvent_ as MessageEvent };