Implement frontend API response caching

[hman38705]

Issue 078: Implement frontend API response caching

Area: Frontend
Priority: Medium
Files: frontend/src/lib/api

Problem

Every page load fetches fresh data. Repeated navigation causes unnecessary API calls.

Acceptance Criteria

• Frequently accessed data is cached client-side\n- Cache TTL matches data volatility\n- Cache is invalidated on mutations\n- Cache behavior is tested

[Hexstar-labs]

@Hexstar-labs has applied to work on this issue as part of the Stellar Wave Program's 4th wave.

Hi, This issue is something i can resolve, Please do assign it to me so i can fix it, Thank you.

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

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Congratulations, @Hexstar-labs! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on April 29, 2026.

🧑‍💻 @Hexstar-labs: 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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[drips-wave]

This issue has been completed by @Hexstar-labs as part of the Stellar Wave Program's 4th Wave 🥳

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