Frontend: Add copy to clipboard for addresses

[Smartdevs17]

Problem

Users cannot easily copy wallet/transaction addresses.

Proposed Solution

Add copy button next to addresses.

Acceptance Criteria

• Add copy button to wallet address in header
• Add copy button to transaction hashes
• Show success feedback on copy
• Use clipboard API

Technical Notes

• Files: frontend/components/layout/Header.tsx

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Congratulations, @KingDavid9999! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

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[TS-mfon]

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

Please assign this to me
lets coook

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[luighis]

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

Hi 👋, I'm a front-end UI/UX developer with experience in Next.js, TypeScript, Shadcn, Zustand, Tailwind CSS, and more.

I've reviewed the requirements and I'd love to resolve this issue.
I actively contribute to several open-source projects and submit high-quality PR. 
The code will be clean, composable, and follow Agenticpay conventions

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[OluwapelumiElisha]

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

Hello,

I would like to work on this issue.

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