Add decimal-precision validation to the token formatting helpers in src/utils/token.ts

[Jagadeeshftw]

📌 Description

src/utils/token.ts formats token amounts using each token's decimals; if a token reports an unexpected decimals value (e.g. 0, negative, or absurdly large), formatting can silently produce a wrong or misleading amount.

🧩 Requirements and context

• Validate that decimals is a non-negative integer within a sane bound (e.g. 0-30) before using it in formatting.
• Throw or return a clear error for out-of-bound decimals rather than silently producing a malformed string.
• Add regression tests for 0 decimals, very large decimals, and negative decimals.

🛠️ Suggested execution

1. Add a decimals-bounds check at the top of the relevant formatting function(s) in src/utils/token.ts.
2. Add/extend src/utils/token.test.ts for the new edge cases.

✅ Acceptance criteria

• Out-of-bound decimals values raise a clear, typed error instead of producing a silently wrong formatted amount.
• Valid decimals values (including 0) format correctly.

🔒 Security notes

Prevents a malicious/malformed token contract from causing a misleading displayed amount downstream.

📋 Guidelines

• Minimum 95% test coverage
• Clear documentation
• Timeframe: 96 hours

[fahatadam]

@fahatadam has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Can you assign me this issue.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @fahatadam to this issue.

[Jagadeeshftw]

Assigned @fahatadam to this issue. Please open a PR referencing this issue (e.g. Closes #173) when you're ready. If you have questions along the way, feel free to join our contributor chat: https://t.me/+vTbe0hOUKrFhNTJl

[drips-wave]

Congratulations, @fahatadam! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

🧑‍💻 @fahatadam: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

Warning

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[Jagadeeshftw]

Thanks for applying here. Please also join our Telegram group here: https://t.me/+vTbe0hOUKrFhNTJl. It helps us keep communication clear while we review contributions.