fix: 8 quality + UX improvements
1. Cookie 'Zwecke' false positive: added 'um...zu', 'dienen', 'helfen',
'ermöglichen' patterns — catches purpose descriptions without 'Zweck'
2. Kurzhinweis: added empty all_checks for short documents (<200 words)
3. Bezeichnungsfeld: placeholder shows 'Version / Stand' for typed docs,
'Dokumentname' for 'Sonstiges'
4. DocCheckTab state persistence: entries + results survive navigation
5. DocCheck history: saves each check with date, doc count, findings
6. History display: 'Letzte Pruefungen' section at bottom of tab
7. ChecklistView: shows 'X von Y Pruefpunkten bestanden' per document
8. Results persist in localStorage across page navigation
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Benjamin Admin
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