[Frontend] [Feature] Build Dashboard View for previously minted Provenance Certificates

[Tybravo]

🎯 Goal

Create a gallery view UI in the user dashboard to view all past certificates.

📋 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

• React / Tailwind CSS

📂 Affected Path

frontend/app/dashboard/certificates/page.tsx

✅ Acceptance Criteria

• View renders certificates properly.

🔗 PR Requirements

• PR description must include: Closes #[issue_id]