fix: resolve TypeScript compilation errors

- Export OplogEntry from storage interface
- Fix Buffer type incompatibility in decryption (use Buffer.from)

Author: mrdevrobot

packages/core/src/storage/interface.ts

@@ -1,4 +1,5 @@
 import { HLCTimestamp, Document, OplogEntry } from '@entgldb/protocol';
+export type { OplogEntry };
 
 /**
  * Storage interface that must be implemented by persistence adapters

packages/network/src/tcp-client.ts

@@ -197,7 +197,8 @@ export class TcpSyncClient {
                 const tag = messageData.subarray(2 + ivLen, 2 + ivLen + tagLen);
                 const ciphertext = messageData.subarray(2 + ivLen + tagLen);
 
-                messageData = CryptoHelper.decrypt(ciphertext, iv, tag, this.cipherState.decryptKey);
+                const decrypted = CryptoHelper.decrypt(ciphertext, iv, tag, this.cipherState.decryptKey);
+                messageData = Buffer.from(decrypted);
             }
 
             const messageType = messageData[0];

packages/network/src/tcp-server.ts

@@ -103,7 +103,8 @@ export class TcpSyncServer {
                     const tag = messageData.subarray(2 + ivLen, 2 + ivLen + tagLen);
                     const ciphertext = messageData.subarray(2 + ivLen + tagLen);
 
-                    messageData = CryptoHelper.decrypt(ciphertext, iv, tag, cipherState.decryptKey);
+                    const decrypted = CryptoHelper.decrypt(ciphertext, iv, tag, cipherState.decryptKey);
+                    messageData = Buffer.from(decrypted);
                 }
 
                 try {