WEB3-029: Admin Dashboard — Events Management

[FuRankLy]

User Story

As an admin, I want to create events, view attendees, and delete events.

Description

Events tab: event list with attendee counts, add event form, event detail with attendees, delete with confirmation.

Acceptance Criteria

• Events list with real data
• Add event form creates via API
• Event detail shows attendees
• Delete with confirmation
• Success/error toasts
• Dark/light mode

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