Create missing UI Card components

[DeborahOlaboye]

Description

Admin dashboard imports Card components that don't exist, causing the page to crash.

Current State

• File: frontend/src/app/admin/page.tsx
• Imports: Card, CardContent, CardHeader, CardTitle from @/components/ui/card
• File doesn't exist: frontend/src/components/ui/card.tsx

Expected Behavior

Create the missing card components using Radix UI primitives or install shadcn/ui.

Impact

High - Admin dashboard page won't render

[victor-olamide]

hello, I would love to work on this Issue please assign.