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/vitest/dist/path.js

@@ -0,0 +1,7 @@
+import url from 'node:url';
+import { resolve } from 'pathe';
+
+const rootDir = resolve(url.fileURLToPath(import.meta.url), "../../");
+const distDir = resolve(url.fileURLToPath(import.meta.url), "../../dist");
+
+export { distDir, rootDir };