feat: Scan history — shows last 20 scans with URL, date, findings count

- localStorage-based scan history (persists across sessions)
- Each completed scan adds entry: URL, timestamp, findings count, docs count
- 'Letzte Scans' section below results shows clickable history entries
- Click loads URL into form (and shows cached result if same URL)
- Max 20 entries, deduplicates by URL (latest scan wins)
- History visible in 'Website-Scan' tab

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

admin-compliance/app/sdk/agent/page.tsx

@@ -33,6 +33,10 @@ export default function AgentPage() {
   })
   const [scanProgress, setScanProgress] = useState<string>('')
   const [activeScanId, setActiveScanId] = useState<string>(() => typeof window !== 'undefined' ? localStorage.getItem('agent-scan-id') || '' : '')
+  const [scanHistory, setScanHistory] = useState<{ url: string; date: string; findings: number; docs: number }[]>(() => {
+    if (typeof window === 'undefined') return []
+    try { return JSON.parse(localStorage.getItem('agent-scan-history') || '[]') } catch { return [] }
+  })
   const { analyze, answerFollowUp, loading, error, result, history } = useAgentAnalysis()
 
   // Persist state to localStorage
@@ -62,6 +66,7 @@ export default function AgentPage() {
             localStorage.setItem('agent-scan-result', JSON.stringify(data.result))
             localStorage.removeItem('agent-scan-id')
             setActiveScanId('')
+            _addToHistory(data.result)
             return
           }
           if (data.status === 'failed') {
@@ -86,6 +91,33 @@ export default function AgentPage() {
     return () => { cancelled = true }
   }, []) // eslint-disable-line react-hooks/exhaustive-deps
 
+  const _addToHistory = (result: any) => {
+    const entry = {
+      url: url || result.url || '',
+      date: new Date().toISOString(),
+      findings: result.findings?.length || 0,
+      docs: result.discovered_documents?.length || 0,
+    }
+    const updated = [entry, ...scanHistory.filter(h => h.url !== entry.url)].slice(0, 20)
+    setScanHistory(updated)
+    localStorage.setItem('agent-scan-history', JSON.stringify(updated))
+  }
+
+  const _loadFromHistory = (entry: { url: string }) => {
+    setUrl(entry.url)
+    setTab('scan')
+    // Load saved result if same URL
+    try {
+      const saved = localStorage.getItem('agent-scan-result')
+      if (saved) {
+        const parsed = JSON.parse(saved)
+        if (parsed.url === entry.url) {
+          setScanData(parsed)
+        }
+      }
+    } catch {}
+  }
+
   const handleSubmit = async (e: React.FormEvent) => {
     e.preventDefault()
     if (!url.trim()) return
@@ -129,6 +161,7 @@ export default function AgentPage() {
             localStorage.setItem('agent-scan-result', JSON.stringify(pollData.result))
             localStorage.removeItem('agent-scan-id')
             setActiveScanId('')
+            _addToHistory(pollData.result)
             break
           }
           if (pollData.status === 'failed') {
@@ -242,6 +275,32 @@ export default function AgentPage() {
       {tab === 'quick' && (
         <AnalysisHistory history={history} onSelect={r => { setUrl(r.url); analyze(r.url, mode) }} />
       )}
+
+      {/* Scan History */}
+      {tab === 'scan' && scanHistory.length > 0 && (
+        <div className="border border-gray-200 rounded-xl p-4">
+          <h4 className="text-sm font-medium text-gray-700 mb-3">Letzte Scans</h4>
+          <div className="space-y-2">
+            {scanHistory.map((h, i) => (
+              <button key={i} onClick={() => _loadFromHistory(h)}
+                className="w-full flex items-center justify-between p-3 rounded-lg border border-gray-100 hover:border-purple-200 hover:bg-purple-50/30 transition-all text-left">
+                <div className="min-w-0 flex-1">
+                  <div className="text-sm font-medium text-gray-900 truncate">{h.url}</div>
+                  <div className="text-xs text-gray-500">
+                    {new Date(h.date).toLocaleDateString('de-DE', { day: '2-digit', month: '2-digit', year: 'numeric', hour: '2-digit', minute: '2-digit' })}
+                  </div>
+                </div>
+                <div className="flex items-center gap-3 shrink-0 ml-3">
+                  {h.docs > 0 && <span className="text-xs text-purple-600">{h.docs} Dok.</span>}
+                  <span className={`text-xs font-medium ${h.findings > 0 ? 'text-red-600' : 'text-green-600'}`}>
+                    {h.findings} Findings
+                  </span>
+                </div>
+              </button>
+            ))}
+          </div>
+        </div>
+      )}
     </div>
   )
 }