. Add keyboard navigation support

[DeFiVC]

What: Add keyboard navigation support across the application for accessibility.

Why: Keyboard-only users can't navigate the app effectively. Tab order is inconsistent, and many interactive elements aren't keyboard accessible.

Scope: Add proper tabIndex to interactive elements. Ensure logical tab order. Add keyboard handlers for custom components (course cards, module list, quiz interface). Test with screen reader.

Acceptance criteria:

• All interactive elements are focusable
• Tab order is logical
• Enter/Space activates buttons and links
• Escape closes modals and dropdowns

Technical context: src/components/ — all components. src/app/ — all pages.

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[adedamolamiposi]

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

Can you assign this issue to me? I'd like to work on it.

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

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox!

@adedamolamiposi's PR #390 was approved and merged by @DeFiVC.

🏆 @adedamolamiposi: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (602 total points). Track your full progress on GrantFox.

👏 Great work, @adedamolamiposi! Keep contributing to ChainLearnOfficial.

[drips-wave]

This issue has been completed by @adedamolamiposi as part of the Stellar Wave Program's 8th Wave 🥳

😎 @adedamolamiposi: 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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