Implement frontend dark mode support

[hman38705]

Issue 080: Implement frontend dark mode support

Area: Frontend
Priority: Low
Files: frontend/src/styles/accessibility.css, frontend/src/app/layout.tsx

Problem

Application has no dark mode. Users with dark mode preference see bright white interface.

Acceptance Criteria

• Dark mode respects system preference\n- Manual toggle is available\n- Preference is persisted\n- All components support both modes

[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.

Warning

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[drips-wave]

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

😎 @Hexstar-labs: 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. You can also Leave a review to share your experience working on this issue.

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