Migrate Utility Functions and Libraries to TypeScript

[Nanle-code]

Convert utility files in src/lib/** and src/utils/** to TypeScript. These are foundational modules used across the application for Stellar SDK interactions, data transformation, and formatting.

Acceptance Criteria:

• All .js files converted to .ts
• Functions have proper parameter and return types
• Complex data structures have interfaces defined
• SDK utility types are properly exported
• Unit tests remain passing
• Documentation includes type examples

[BigElv]

@BigElv has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi maintainer I would love to work on this issue

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

[Danielodingz]

@Danielodingz has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

hey maintainer, please i would like to work on this issue.

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

[brodapeethar]

@brodapeethar has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hey maintainer, I would love to work on this issue.
kindly pls assign it to me

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

[GauravKarakoti]

@GauravKarakoti has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Allow me to work on this one

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

[drips-wave]

Congratulations, @BigElv! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @BigElv: 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

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊