Add copy button labels to dashboard payload snippets

[emrekayat]

Goal

Make dashboard payload snippets easier to use during demos by adding clear copy affordances.

Scope

• Add a small copy button or accessible label near the live payload preview.
• Copy the visible JSON payload to the clipboard.
• Show concise success/failure feedback.
• Keep the existing payload content unchanged.

Acceptance criteria

• Users can copy the live payload preview JSON.
• The button has an accessible label.
• Success/failure feedback is visible and concise.
• npm run typecheck --workspace @query402/web passes.
• npm run build --workspace @query402/web passes.

Notes

Keep this focused to the existing Control Deck preview surface.

[vickachi]

@vickachi has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I'm a full-stack Software Engineer
I'd love to take this on — thanks for considering me

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

[drips-wave]

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

🧑‍💻 @vickachi: 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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🌊 Happy Wave 🌊