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/@libsql/client/lib-esm/node.d.ts

@@ -0,0 +1,7 @@
+import type { Config, Client } from "@libsql/core/api";
+export * from "@libsql/core/api";
+/** Creates a {@link Client} object.
+ *
+ * You must pass at least an `url` in the {@link Config} object.
+ */
+export declare function createClient(config: Config): Client;