feat: add AdminMemberTiers page, MemberBadge component, and SettingsLayout; refactor routes and sidebar for improved navigation

src/components/MemberBadge.js

@@ -0,0 +1,19 @@
+// src/components/MemberBadge.js
+import React from 'react';
+import { Badge } from './ui/badge';
+import { getTierForMember } from '../utils/member-tiers';
+import { MEMBER_TIER_ICONS } from '../config/memberTierIcons';
+
+const MemberBadge = ({ memberSince, tiers }) => {
+  const tier = getTierForMember(memberSince, tiers);
+  const Icon = MEMBER_TIER_ICONS[tier.icon] || MEMBER_TIER_ICONS.FaUser;
+
+  return (
+    <Badge className={`px-3 py-1 rounded-md text-sm flex items-center gap-2 ${tier.badgeClass}`}>
+      <Icon className="h-4 w-4" />
+      {tier.label}
+    </Badge>
+  );
+};
+
+export default MemberBadge;