Implement `ApiKeyReveal` UI

[codebestia]

Context: For security, API keys are only shown once right after generation.

Requirements:

• Create an alert box component.
• Display a mock long alphanumeric string.
• Include a warning message: "Please copy this key now. It will not be shown again."
• Include a copy-to-clipboard button.

Acceptance Criteria:

• UI commands attention and successfully copies the string.

[mikevill20]

@mikevill20 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hello maintainer, please assign this issue to me. Thanks.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @mikevill20 to this issue.

[drips-wave]

Congratulations, @mikevill20! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @mikevill20: 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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