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/base-x/src/cjs/index.d.ts

@@ -0,0 +1,9 @@
+declare function base(ALPHABET: string): base.BaseConverter;
+export default base;
+declare namespace base {
+    interface BaseConverter {
+        encode(buffer: Uint8Array | number[]): string;
+        decodeUnsafe(string: string): Uint8Array | undefined;
+        decode(string: string): Uint8Array;
+    }
+}