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/yaml/dist/stringify/stringify.d.ts

@@ -0,0 +1,21 @@
+import type { Document } from '../doc/Document';
+import type { Alias } from '../nodes/Alias';
+import type { ToStringOptions } from '../options';
+export type StringifyContext = {
+    actualString?: boolean;
+    allNullValues?: boolean;
+    anchors: Set<string>;
+    doc: Document;
+    forceBlockIndent?: boolean;
+    implicitKey?: boolean;
+    indent: string;
+    indentStep: string;
+    indentAtStart?: number;
+    inFlow: boolean | null;
+    inStringifyKey?: boolean;
+    flowCollectionPadding: string;
+    options: Readonly<Required<Omit<ToStringOptions, 'collectionStyle' | 'indent'>>>;
+    resolvedAliases?: Set<Alias>;
+};
+export declare function createStringifyContext(doc: Document, options: ToStringOptions): StringifyContext;
+export declare function stringify(item: unknown, ctx: StringifyContext, onComment?: () => void, onChompKeep?: () => void): string;