build admin control panel

[henrypeters]

What was added:

• useAdminContract hook — reads contract state (admin, oracle, paused) and wraps all admin write operations
• ConfirmDialog component — modal with a 10-second countdown before the confirm button becomes clickable, preventing accidental destructive actions
• AdminPanel page — sections for pause/unpause toggle, token allowlist (add/remove), oracle rotation with current/new address preview, admin transfer, and a timestamped action log of all operations
  performed in the session
• Route wired into App.tsx — no router dependency needed

Security properties:

• Wallet must be connected and match the on-chain admin address; all other connected wallets see an access-denied message
• Every state-changing action requires explicit confirmation through the countdown dialog
• All actions are logged with timestamps in the session action log
  closes Build Admin Control Panel UI #743

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@henrypeters Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

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