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/src/suspense.d.ts

@@ -0,0 +1,15 @@
+import { Component, ComponentChild, ComponentChildren } from '../../src';
+
+//
+// Suspense/lazy
+// -----------------------------------
+export function lazy<T>(loader: () => Promise<{ default: T } | T>): T;
+
+export interface SuspenseProps {
+	children?: ComponentChildren;
+	fallback: ComponentChildren;
+}
+
+export class Suspense extends Component<SuspenseProps> {
+	render(): ComponentChild;
+}