Add "Neu verarbeiten" button to VocabularyTab

Allows reprocessing pages from the vocabulary view to apply
new merge logic without navigating back to page selection.

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

studio-v2/app/vocab-worksheet/components/VocabularyTab.tsx

@@ -104,6 +104,13 @@ export function VocabularyTab({ h }: { h: VocabWorksheetHook }) {
               <option value="de">Silben: nur DE</option>
               <option value="all">Silben: Alle</option>
             </select>
+            <button
+              onClick={() => h.reprocessPages(h.ipaMode, h.syllableMode)}
+              className={`px-3 py-2 rounded-xl text-sm font-medium transition-colors ${isDark ? 'bg-orange-500/20 hover:bg-orange-500/30 text-orange-200 border border-orange-500/30' : 'bg-orange-50 hover:bg-orange-100 text-orange-700 border border-orange-200'}`}
+              title="Seiten erneut verarbeiten (OCR + Zeilenmerge)"
+            >
+              Neu verarbeiten
+            </button>
             <button onClick={h.saveVocabulary} className={`px-4 py-2 rounded-xl text-sm font-medium transition-colors ${isDark ? 'bg-white/10 hover:bg-white/20 text-white' : 'bg-slate-100 hover:bg-slate-200 text-slate-900'}`}>
               Speichern
             </button>