fix: useMemo vor early returns verschieben (React Hooks Regel)

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

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

@@ -347,6 +347,28 @@ export function StepLlmReview({ sessionId, onNext }: StepLlmReviewProps) {
     ? `${KLAUSUR_API}/api/v1/ocr-pipeline/sessions/${sessionId}/image/cropped`
     : ''
 
+  // Snap all cells in the same column to consistent x/w positions
+  // Uses the median x and width per col_index so columns align vertically
+  const colPositions = useMemo(() => {
+    const byCol = new Map<number, { xs: number[]; ws: number[] }>()
+    for (const cell of cells) {
+      if (!cell.bbox_pct) continue
+      const entry = byCol.get(cell.col_index) || { xs: [], ws: [] }
+      entry.xs.push(cell.bbox_pct.x)
+      entry.ws.push(cell.bbox_pct.w)
+      byCol.set(cell.col_index, entry)
+    }
+    const result = new Map<number, { x: number; w: number }>()
+    for (const [colIdx, { xs, ws }] of byCol) {
+      xs.sort((a, b) => a - b)
+      ws.sort((a, b) => a - b)
+      const medianX = xs[Math.floor(xs.length / 2)]
+      const medianW = ws[Math.floor(ws.length / 2)]
+      result.set(colIdx, { x: medianX, w: medianW })
+    }
+    return result
+  }, [cells])
+
   if (!sessionId) {
     return <div className="text-center py-12 text-gray-400">Bitte zuerst eine Session auswaehlen.</div>
   }
@@ -402,28 +424,6 @@ export function StepLlmReview({ sessionId, onNext }: StepLlmReviewProps) {
   // Active entry for highlighting on image
   const activeEntry = vocabEntries.find((_: WordEntry, i: number) => activeRowIndices.has(i))
 
-  // Snap all cells in the same column to consistent x/w positions
-  // Uses the median x and max width per col_index so columns align vertically
-  const colPositions = useMemo(() => {
-    const byCol = new Map<number, { xs: number[]; ws: number[] }>()
-    for (const cell of cells) {
-      if (!cell.bbox_pct) continue
-      const entry = byCol.get(cell.col_index) || { xs: [], ws: [] }
-      entry.xs.push(cell.bbox_pct.x)
-      entry.ws.push(cell.bbox_pct.w)
-      byCol.set(cell.col_index, entry)
-    }
-    const result = new Map<number, { x: number; w: number }>()
-    for (const [colIdx, { xs, ws }] of byCol) {
-      xs.sort((a, b) => a - b)
-      ws.sort((a, b) => a - b)
-      const medianX = xs[Math.floor(xs.length / 2)]
-      const medianW = ws[Math.floor(ws.length / 2)]
-      result.set(colIdx, { x: medianX, w: medianW })
-    }
-    return result
-  }, [cells])
-
   const pct = progress ? Math.round((progress.current / progress.total) * 100) : 0
 
   /** Handle inline edit of a cell in the overlay */