Testing: Add frontend mutation tests for validation logic

[Vera3289]

Description: Use mutation or input variation tests to verify frontend validation logic handles unexpected values safely.

Acceptance Criteria:

• The frontend validation layer is exercised with invalid input cases.
• Tests verify rejection or safe handling of malformed data.
• New cases are added to the test suite.
• Coverage improves for validation logic.

Priority: Medium
Estimated Effort: Medium
Dependencies: frontend testing tools

[Dagdon]

@Dagdon has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello, can I work on this please?

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

[almuslavish]

@almuslavish has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

i would like to work on this issue pls

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[Austinaminu2]

@Austinaminu2 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

please assign me this

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Austinaminu2 to this issue.

[drips-wave]

Congratulations, @Austinaminu2! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @Austinaminu2: 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.

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