feat(audit): P47 localStorage-Quota — safeSetItem mit Auto-Prune

storageHelpers.ts: safeSetItem faengt QuotaExceededError, prunet
alte doc-check-result-*-Eintraege (oldest first, MAX_KEEP=10) und
retried. Bei zweitem Fail aggressiver pruefen.

DocCheckTab.tsx nutzt safeSetItem statt setItem fuer doc-check-results,
result-Keys und history. Verhindert silent-data-loss + Crash wenn
~5MB localStorage-Limit erreicht.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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

@@ -3,6 +3,7 @@
 import React, { useState } from 'react'
 import { ChecklistView } from './ChecklistView'
 import { PreScanWizard, useScanContext, isContextComplete } from './PreScanWizard'
+import { safeSetItem } from './storageHelpers'
 
 interface DocEntry {
   id: string
@@ -118,13 +119,13 @@ export function DocCheckTab() {
         if (pollData.status === 'completed' && pollData.result) {
           setResults(pollData.result)
           setProgress('')
-          localStorage.setItem('doc-check-results', JSON.stringify(pollData.result))
+          safeSetItem('doc-check-results', JSON.stringify(pollData.result))
           const resultKey = `doc-check-result-${Date.now()}`
-          try { localStorage.setItem(resultKey, JSON.stringify(pollData.result)) } catch { /* quota */ }
+          safeSetItem(resultKey, JSON.stringify(pollData.result))
           const entry = { date: new Date().toISOString(), urls: validEntries.length, findings: pollData.result.total_findings || 0, resultKey }
           const updated = [entry, ...history].slice(0, 30)
           setHistory(updated)
-          localStorage.setItem('doc-check-history', JSON.stringify(updated))
+          safeSetItem('doc-check-history', JSON.stringify(updated))
           break
         }
         if (pollData.status === 'failed') {

admin-compliance/app/sdk/agent/_components/storageHelpers.ts

@@ -0,0 +1,71 @@
+/**
+ * P47 — localStorage-Quota-Management.
+ *
+ * Wenn alte Compliance-Check-Ergebnisse den Browser-Storage fuellen,
+ * versucht das setItem mit QuotaExceededError zu fangen, prunet
+ * alte doc-check-result-*-Eintraege (oldest first) und retried.
+ *
+ * Wird von DocCheckTab/BannerCheckTab/etc beim Persistieren der
+ * Result-Bloebs benutzt.
+ */
+
+const RESULT_KEY_PREFIX = 'doc-check-result-'
+const MAX_KEEP = 10  // Maximal 10 alte Result-Bloebs behalten.
+
+export function safeSetItem(key: string, value: string): boolean {
+  try {
+    localStorage.setItem(key, value)
+    return true
+  } catch (err: any) {
+    if (err?.name !== 'QuotaExceededError'
+        && err?.code !== 22 && err?.code !== 1014) {
+      console.warn('localStorage setItem failed:', err)
+      return false
+    }
+    pruneOldResults()
+    try {
+      localStorage.setItem(key, value)
+      return true
+    } catch {
+      // Pruning hat nicht gereicht — aggressiver pruefen
+      pruneOldResults(0)
+      try {
+        localStorage.setItem(key, value)
+        return true
+      } catch {
+        console.warn('localStorage immer noch voll, wert wird verworfen')
+        return false
+      }
+    }
+  }
+}
+
+function pruneOldResults(keep: number = MAX_KEEP): void {
+  try {
+    const keys: { key: string; ts: number }[] = []
+    for (let i = 0; i < localStorage.length; i++) {
+      const k = localStorage.key(i)
+      if (!k || !k.startsWith(RESULT_KEY_PREFIX)) continue
+      const ts = Number(k.slice(RESULT_KEY_PREFIX.length)) || 0
+      keys.push({ key: k, ts })
+    }
+    keys.sort((a, b) => a.ts - b.ts)  // oldest first
+    const toRemove = keys.slice(0, Math.max(0, keys.length - keep))
+    for (const k of toRemove) {
+      try { localStorage.removeItem(k.key) } catch {}
+    }
+  } catch {}
+}
+
+export function getStorageUsageMB(): number {
+  let bytes = 0
+  try {
+    for (let i = 0; i < localStorage.length; i++) {
+      const k = localStorage.key(i)
+      if (!k) continue
+      const v = localStorage.getItem(k) || ''
+      bytes += k.length + v.length
+    }
+  } catch {}
+  return bytes / (1024 * 1024)
+}