WEB3-028: Admin Dashboard — Members Management

[FuRankLy]

User Story

As an admin, I want to search members, edit their events, promote/demote admins, and remove members.

Description

Members tab: search, table with role badges, edit panel (member details, add/remove events, promote/demote), remove with confirmation. Pagination.

Acceptance Criteria

• Members table with search
• Edit panel with event management
• Add/remove events from users
• Remove member with confirmation
• Promote/demote with confirmation
• Pagination
• Success/error toasts
• Dark/light mode

Points: 6 · Blocked By: Designer B's Admin design, WEB3-026