[Frontend] Implement Toast Notifications for Transactions (Apertre3.0)

Category: Frontend / UI

Description:
Currently, users may not know if a transaction (like "Add Crop" or "Transfer Batch") was successful or failed.

Task: Integrate a library like react-hot-toast or react-toastify.

Scope: Trigger a "Success" toast when the transaction is confirmed on the blockchain and an "Error" toast if it fails.

Why: Essential for DApp usability so users aren't left guessing