feat: color bar respects edits + column pattern auto-correction

- Color bar (red/colored indicator) now only shows when word_boxes
  text still matches the cell text — editing the cell hides stale colors
- New "Auto-Korrektur" button: detects dominant prefix+number patterns
  per column (e.g. p.70, p.71) and completes partial entries (.65 → p.65)
  — requires 3+ matching entries before correcting

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

admin-lehrer/components/ocr-pipeline/StepGridReview.tsx

@@ -55,6 +55,7 @@ export function StepGridReview({ sessionId, onNext, saveRef }: StepGridReviewPro
     toggleCellSelection,
     clearCellSelection,
     toggleSelectedBold,
+    autoCorrectColumnPatterns,
   } = useGridEditor(sessionId)
 
   const [showImage, setShowImage] = useState(true)
@@ -246,6 +247,17 @@ export function StepGridReview({ sessionId, onNext, saveRef }: StepGridReviewPro
           </button>
         )}
         <div className="ml-auto flex items-center gap-2">
+          <button
+            onClick={() => {
+              const n = autoCorrectColumnPatterns()
+              if (n === 0) alert('Keine Muster-Korrekturen gefunden.')
+              else alert(`${n} Zelle(n) korrigiert (Muster-Vervollstaendigung).`)
+            }}
+            className="px-2.5 py-1 rounded text-xs border border-purple-200 dark:border-purple-700 bg-purple-50 dark:bg-purple-900/20 text-purple-700 dark:text-purple-300 hover:bg-purple-100 dark:hover:bg-purple-900/40 transition-colors"
+            title="Erkennt Muster wie p.70, p.71 und vervollstaendigt partielle Eintraege wie .65 zu p.65"
+          >
+            Auto-Korrektur
+          </button>
           <button
             onClick={() => setShowImage(!showImage)}
             className={`px-2.5 py-1 rounded text-xs border transition-colors ${