Add Hive-Engine Token to D.Buzz Wallet

Our basic wallet only includes basic features:

1. View Wallet Balances.
2. Claim Rewards.

But we should add the secondary tokens to the wallet balances from https://hive-engine.com

Here's some links to use as a reference:
https://github.com/hive-engine
https://hiveprojects.io/projects/p/he-explorer/

Start by tracing the wallet-balance flow in d.buzz-client and read the Hive Engine and HE Explorer references linked in the issue; no source file or test is named. Done means secondary Hive-Engine token balances appear alongside the wallet’s existing balances, with the expected behavior verified through the project’s available checks.

Written by the indexing model from the issue text.