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') {