Guard the date-formatting utilities against invalid input

[RUKAYAT-CODER]

Background

The helpers in `src/utils/dateUtils.ts` (`formatDate`, `formatShortDate`, `formatTime`) pass `new Date(date)` straight into `Intl.DateTimeFormat.format`, which throws `RangeError: Invalid time value` when the input is an unparseable string/number, and `formatRelative` produces nonsensical output for the same. There is also no test file for this module. Add an invalid-date guard that returns a safe fallback (e.g. an empty string or a passed-in placeholder) and add unit tests.

Files to modify (2)

• src/utils/dateUtils.ts
• src/utils/tests/dateUtils.test.ts

Acceptance Criteria

• Implemented across the listed files
• Unit/integration tests added or updated and passing
• No regression; follows project coding standards

[CollinsKRO]

@CollinsKRO has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi, I can fix this

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

[Muyideen-js]

@Muyideen-js has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hi, I can fix this

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

[drips-wave]

Congratulations, @CollinsKRO! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @CollinsKRO: 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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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox!

@CollinsKRO's PR #1327 was approved and merged by @RUKAYAT-CODER.

🏆 @CollinsKRO: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (341 total points). Track your full progress on GrantFox.

👏 Great work, @CollinsKRO! Keep contributing to rinafcode.

[drips-wave]

This issue has been marked as completed by a Drips Wave moderator for @CollinsKRO as part of the Stellar Wave Program's 8th Wave 🥳

Moderator's reason: [Auto-assessed] The PR was merged by maintainer @RUKAYAT-CODER with an appreciative comment on 2026-09-06, and successfully implements the requested invalid-date guards and comprehensive unit tests.

😎 @CollinsKRO: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here.

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ℹ️ Note: This issue was marked complete via moderation. Points were issued even though the GitHub issue remains open.