add super admin section to admin sidebar

[jagadeep298218]

Summary

Adds a dedicated "Super Admin" section to the admin sidebar that only renders for users with the super_admin role.

Also resolves a high-severity security vulnerability in minimatch that was blocking CI.

Changes

Feature: Super Admin Sidebar Section

• Added superAdminNav items array with a Dashboard link (/superadmin)
• Conditionally render new NavSection after the "Event" section when user?.role === 'super_admin'
• Imported LayoutDashboard icon from lucide-react

Security Fix

• Updated minimatch from 10.2.2 → 10.2.4 via npm audit fix
• Resolves GHSA-7r86-cg39-jmmj and GHSA-23c5-xmqv-rm74

Implementation Details

• Follows existing NavSection component pattern
• Uses existing role check pattern: user?.role === 'super_admin'
• Super admin pages are already wrapped with <RequireSuperAdmin> in routes.tsx

Screenshot

[balebbae]

lgtm