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/preact/compat/client.d.ts

@@ -0,0 +1,11 @@
+import * as preact from '../src';
+
+export function createRoot(container: preact.ContainerNode): {
+	render(children: preact.ComponentChild): void;
+	unmount(): void;
+};
+
+export function hydrateRoot(
+	container: preact.ContainerNode,
+	children: preact.ComponentChild
+): typeof createRoot;