refactor: remove Diagnostics component and related LLM call telemetry

src/pages/Admin/index.jsx

@@ -1,5 +1,5 @@
 import { useState, useEffect } from 'react';
-import { Database, FileText, Settings, Users, Network, Clock, CheckCircle2, AlertCircle, Save, Info, Layers, CheckSquare, CalendarDays, Activity, RefreshCw, AlertTriangle } from 'lucide-react';
+import { Database, FileText, Settings, Users, Network, Clock, CheckCircle2, AlertCircle, Save, Info, Layers, CheckSquare, CalendarDays, RefreshCw, AlertTriangle } from 'lucide-react';
 import Card from '../../components/ui/Card';
 import Tag from '../../components/ui/Tag';
 import Button from '../../components/ui/Button';
@@ -12,7 +12,6 @@ import ContentManager from '../../components/admin/ContentManager';
 import TestManager from '../../components/admin/TestManager';
 import TeamManager from '../../components/admin/TeamManager';
 import CurriculumManager from '../../components/admin/CurriculumManager';
-import Diagnostics from '../../components/admin/Diagnostics';
 import { Trash2 } from 'lucide-react';
 
 const TIER_PLACEHOLDERS = {
@@ -93,7 +92,6 @@ const Admin = () => {
     { key: 'curriculum', icon: CalendarDays, label: 'Curriculum' },
     { key: 'graph', icon: Network, label: 'Graph' },
     { key: 'team', icon: Users, label: 'Team' },
-    { key: 'diagnostics', icon: Activity, label: 'Diagnostics' },
     { key: 'settings', icon: Settings, label: 'Settings', bottom: true },
   ];
 
@@ -204,14 +202,6 @@ const Admin = () => {
           </div>
         )}
 
-        {activeTab === 'diagnostics' && (
-          <div className="animate-in fade-in duration-300 max-w-6xl mx-auto">
-            <h1 className="text-3xl text-teal mb-2">Diagnostics</h1>
-            <p className="text-fg-muted mb-8">LLM-aanroepen, tokenverbruik en geschatte kosten.</p>
-            <Diagnostics />
-          </div>
-        )}
-
         {activeTab === 'settings' && (
           <div className="animate-in fade-in duration-300 max-w-2xl">
             <h1 className="text-3xl text-teal mb-2">Settings</h1>