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.mjs

@@ -0,0 +1,24 @@
+import { render, hydrate, unmountComponentAtNode } from 'preact/compat';
+
+export function createRoot(container) {
+	return {
+		// eslint-disable-next-line
+		render: function (children) {
+			render(children, container);
+		},
+		// eslint-disable-next-line
+		unmount: function () {
+			unmountComponentAtNode(container);
+		}
+	};
+}
+
+export function hydrateRoot(container, children) {
+	hydrate(children, container);
+	return createRoot(container);
+}
+
+export default {
+	createRoot,
+	hydrateRoot
+};