WEB3-027: Admin Dashboard — Shell & Overview

[FuRankLy]

User Story

As an admin, I want a dashboard with an overview of club stats.

Description

Dashboard layout with sidebar nav (Overview, Members, Events). Non-admins blocked. Overview shows total members, events, recent signups.

Acceptance Criteria

• Only admins can access
• Non-admins redirected with error
• Sidebar switches tabs
• Overview shows real stats
• Dark/light mode

Points: 5 · Blocked By: Designer B's Admin design, WEB3-026, WEB3-012