Frontend: Add copy-to-clipboard for contract address and tx hashes

[Junirezz]

Goal

Allow users to quickly copy important addresses and hashes.

Scope

• Add a copy icon/button next to contract address and tx hash displays
• Show a brief toast/confirmation on copy
• Ensure accessible label for screen readers

Acceptance Criteria

• Copy succeeds in all modern browsers
• Toast appears and auto-dismisses
• Keyboard accessible

[flashtek-hub]

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

Hi i'm a software developer with both backend and frontend skills
i will love to take on this issue

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

[drips-wave]

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

🧑‍💻 @flashtek-hub: 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

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊