[Frontend] [Feature] Implement shareable public URL view for Provenance Certificates

[Tybravo]

🎯 Goal

Build a dynamic Next.js page (e.g., /certificate/[id]) that publicly displays a verified certificate.

📋 Requirements

• Implement the feature as described in the goal.
• Ensure integration matches the architecture defined in SUMMARY_TYPESCRIPT.md.
• Handle relevant loading and error states gracefully.

🔧 Technical Scope

• Next.js Dynamic Routes

📂 Affected Path

frontend/app/certificate/[id]/page.tsx

✅ Acceptance Criteria

• Page renders public data without authentication.

🔗 PR Requirements

• PR description must include: Closes #[issue_id]