fix(i-d): Geister-Komponenten eliminiert — AIAssistant-Seite erstellt (Agent-Auswahl + AgentChat, STATIC_COMPONENT_MAP registriert nach C3-Pattern); 5 Ghost-Contact-Detail-Tabs aus Backend-Manifesten entfernt; Production-Build mit AIAssistant-Chunk verifiziert (AIAssistant-DVb66TSo.js); tsc exit=0; ruff clean

frontend/src/components/plugins/PluginLoader.tsx

@@ -118,8 +118,8 @@ function normalizeModule(m: ComponentModule): { default: React.ComponentType<any
 const STATIC_COMPONENT_MAP: Record<string, LazyComponentFactory> = {
   // Pages
   '@/pages/AgentDashboard': () => import('@/pages/AgentDashboard').then(normalizeModule),
-  // NOTE: @/pages/AIAssistant is declared in the backend manifest but does
-  // not exist as a frontend page — ghost component, see PROGRESS.md.
+  // BUG (ghost page) fixed in Block I-D: page now exists.
+  '@/pages/AIAssistant': () => import('@/pages/AIAssistant').then(normalizeModule),
   '@/pages/AISettings': () => import('@/pages/AISettings').then(normalizeModule),
   '@/pages/AutomationDashboard': () => import('@/pages/AutomationDashboard').then(normalizeModule),
   '@/pages/AutomationSettings': () => import('@/pages/AutomationSettings').then(normalizeModule),

frontend/src/pages/AIAssistant.tsx

@@ -0,0 +1,64 @@
+import { useState } from 'react';
+import { useTranslation } from 'react-i18next';
+import { useAgents } from '@/api/automation';
+import { Card } from '@/components/ui/Card';
+import { AgentChat } from '@/components/agents/AgentChat';
+
+/**
+ * AI Assistant page (BUG: ghost page fixed — was declared in the backend
+ * manifest but did not exist, see PROGRESS.md "Ghost components").
+ *
+ * Minimal implementation: pick an agent, chat with it. Full agent management
+ * lives in the Agent Dashboard.
+ */
+export default function AIAssistant() {
+  const { t } = useTranslation();
+  const { data: agents, isLoading } = useAgents();
+  const [selectedAgentId, setSelectedAgentId] = useState('');
+
+  const selectedAgent = agents?.find((a) => a.id === selectedAgentId);
+
+  return (
+    <div className="p-6 space-y-4" aria-label={t('ai.assistant', 'AI Assistant')}>
+      <h1 className="text-xl font-semibold text-secondary-900">
+        {t('ai.assistant', 'AI Assistant')}
+      </h1>
+
+      <Card className="p-4">
+        <label
+          htmlFor="assistant-agent-select"
+          className="block text-sm font-medium text-secondary-700 mb-1"
+        >
+          {t('agent.targetAgent', 'Target agent')}
+        </label>
+        <select
+          id="assistant-agent-select"
+          value={selectedAgentId}
+          onChange={(e) => setSelectedAgentId(e.target.value)}
+          className="w-full rounded-lg border border-secondary-300 px-3 py-2 text-sm focus:outline-none focus:ring-2 focus:ring-primary-500"
+        >
+          <option value="">{t('agent.selectTargetAgent', 'Select an agent…')}</option>
+          {(agents ?? []).map((agent) => (
+            <option key={agent.id} value={agent.id}>
+              {agent.name}
+            </option>
+          ))}
+        </select>
+        {!isLoading && (agents ?? []).length === 0 && (
+          <p className="mt-2 text-sm text-secondary-500">
+            {t(
+              'agent.noAgentsHint',
+              'No agents yet — create one in the Agent Dashboard.'
+            )}
+          </p>
+        )}
+      </Card>
+
+      {selectedAgent && (
+        <Card className="p-4">
+          <AgentChat agentId={selectedAgent.id} agentName={selectedAgent.name} />
+        </Card>
+      )}
+    </div>
+  );
+}