Add system roles (superadmin, contributor) to MemberCard badges

Users without a team_role now show their system role instead of
the generic "Team Member" fallback.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

client/src/components/MemberCard.jsx

@@ -13,6 +13,8 @@ const ROLE_BADGES = {
   photographer: { bg: 'bg-cyan-50', text: 'text-cyan-700', label: 'Photographer' },
   videographer: { bg: 'bg-sky-50', text: 'text-sky-700', label: 'Videographer' },
   strategist: { bg: 'bg-rose-50', text: 'text-rose-700', label: 'Strategist' },
+  superadmin: { bg: 'bg-red-50', text: 'text-red-700', label: 'Super Admin' },
+  contributor: { bg: 'bg-slate-50', text: 'text-slate-700', label: 'Contributor' },
   default: { bg: 'bg-gray-50', text: 'text-gray-700', label: 'Team Member' },
 }