feat: Persistent result history — click to reload old scan results

Both DocCheckTab and BannerCheckTab now:
- Store full scan results per history entry in localStorage
- History entries are clickable — loads the saved result immediately
- No need to re-scan to see old results
- Fallback to last result if specific entry not found
- Banner-Check sends HTML email report to mailpit

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

admin-compliance/app/sdk/agent/_components/BannerCheckTab.tsx

@@ -55,7 +55,7 @@ export function BannerCheckTab() {
     try { const s = localStorage.getItem('banner-check-result'); return s ? JSON.parse(s) : null } catch { return null }
   })
   const [categories, setCategories] = useState<string[]>(['all'])
-  const [history, setHistory] = useState<{ url: string; date: string; provider: string; violations: number; pct: number }[]>(() => {
+  const [history, setHistory] = useState<{ url: string; date: string; provider: string; violations: number; pct: number; resultKey: string }[]>(() => {
     if (typeof window === 'undefined') return []
     try { return JSON.parse(localStorage.getItem('banner-check-history') || '[]') } catch { return [] }
   })
@@ -97,14 +97,17 @@ export function BannerCheckTab() {
       setResult(data)
       localStorage.setItem('banner-check-result', JSON.stringify(data))
 
-      // Add to history
+      // Add to history with persistent result
       const violations = data.structured_checks?.filter((c: CheckItem) => !c.passed && !c.skipped).length || 0
+      const resultKey = `banner-check-result-${Date.now()}`
+      try { localStorage.setItem(resultKey, JSON.stringify(data)) } catch { /* quota */ }
       const entry = {
         url: url.trim(),
         date: new Date().toISOString(),
         provider: data.banner_provider || 'Unbekannt',
         violations,
         pct: data.completeness_pct ?? 0,
+        resultKey,
       }
       const updated = [entry, ...history].slice(0, 30)
       setHistory(updated)
@@ -117,8 +120,19 @@ export function BannerCheckTab() {
     }
   }
 
-  const loadFromHistory = (entry: { url: string }) => {
+  const loadFromHistory = (entry: { url: string; resultKey?: string }) => {
     setUrl(entry.url)
+    if (entry.resultKey) {
+      try {
+        const saved = localStorage.getItem(entry.resultKey)
+        if (saved) { setResult(JSON.parse(saved)); return }
+      } catch {}
+    }
+    // Fallback: load last result
+    try {
+      const last = localStorage.getItem('banner-check-result')
+      if (last) setResult(JSON.parse(last))
+    } catch {}
   }
 
   const structuredChecks = result?.structured_checks || []