feat: Add comprehensive error handling for Web3 transactions (#113)

[oscarj007]

Closes #113

Description

This PR resolves the issue where raw, unreadable Web3 transaction errors were displayed to the user. It introduces a robust dictionary mapper utility to translate low-level JSON-RPC hex strings and contract reversion flags into clear, helpful, user-friendly feedback.

Implemented Error Mappings

• 4001: Maps user rejection signatures to a prompt to re-confirm via wallet.
• -32603: Captures internal node failures and suggests alternative RPC nodes.
• INSUFFICIENT_FUNDS: Intercepts low ETH/gas levels and alerts the user to fund their wallet.
• UNPREDICTABLE_GAS_LIMIT: Identifies simulation blocks where a contract will revert.
• NETWORK_ERROR: Handles broken endpoints or provider connection drops gracefully.

How Has This Been Tested?

Created a local simulation script (test_error.ts) and executed it via ts-node. Verified that both numeric codes and string phrases trigger the intended user display sentence without throwing any runtime exceptions.

Type of Change

• Improvement (non-breaking change which improves existing functionality)

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