. Add `error-boundary.tsx` improvements

[DeFiVC]

What: Improve the ErrorBoundary component with error reporting, retry logic, and fallback UI options.

Why: The current ErrorBoundary shows a generic error. It needs to report errors to a service, offer retry, and allow custom fallback UIs.

Scope: Add error reporting (console.error or external service). Add retry button with exponential backoff. Allow custom fallback UI via props. Add error details toggle for developers.

Acceptance criteria:

• Errors are reported
• Retry button works
• Custom fallback is supported
• Error details are toggleable

Technical context: src/components/shared/error-boundary.tsx — existing ErrorBoundary. src/app/layout.tsx — root layout.

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[roobie001]

@roobie001 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello maintainer, can i work on this issue please.

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[Just-Bamford]

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

Hi maintainer, i am interested in contributing to the task and can ensure timely delivery with clean implementation.

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

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

🧑‍💻 @Just-Bamford: 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!

@Just-Bamford's PR #394 was approved and merged by @DeFiVC.

🏆 @Just-Bamford: You earned 40 FoxPoints for this contribution! Your current tier: Builder (1,705 total points). Track your full progress on GrantFox.

👏 Great work, @Just-Bamford! Keep contributing to ChainLearnOfficial.

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

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