Improve error msg for insufficient funds

[vidvidvid]

• closes Give a better error message if the user doesnt have enough ETH for the gas deposit #397

[vercel]

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[octane-security-app]

Summary by Octane

New Contracts

No new contracts were added.

Updated Contracts

• TransactionFlow.tsx: Added specific error handling for insufficient gas funds with a user-friendly message.

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🔗 Commit Hash: 4d8fc07

[octane-security-app]

Overview

Vulnerabilities found:	1

Detailed findings

frontend/app/src/services/TransactionFlow.tsx

• Narrow insufficient-funds detection regex in TransactionFlow.tsx causes inconsistent error guidance. See more

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🔗 Commit Hash: 4d8fc07
🛡️ Octane Dashboard: All vulnerabilities