fix: Overlay spaltenweise Ausrichtung per Median-Snap

Alle Zellen einer Spalte bekommen die gleiche x-Position (Median)
damit Werte vertikal korrekt untereinander stehen.

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

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

@@ -1,6 +1,6 @@
 'use client'
 
-import { useCallback, useEffect, useRef, useState } from 'react'
+import { useCallback, useEffect, useMemo, useRef, useState } from 'react'
 import type { GridCell, GridResult, WordEntry, ColumnMeta } from '@/app/(admin)/ai/ocr-pipeline/types'
 
 const KLAUSUR_API = '/klausur-api'
@@ -402,6 +402,28 @@ 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 */
@@ -672,6 +694,9 @@ export function StepLlmReview({ sessionId, onNext }: StepLlmReviewProps) {
                 >
                   {cells.map(cell => {
                     if (!cell.bbox_pct || !cell.text) return null
+                    const col = colPositions.get(cell.col_index)
+                    const cellX = col?.x ?? cell.bbox_pct.x
+                    const cellW = col?.w ?? cell.bbox_pct.w
                     const aspect = imageNaturalSize ? imageNaturalSize.h / imageNaturalSize.w : 4 / 3
                     const containerH = reconWidth * aspect
                     const cellHeightPx = containerH * (cell.bbox_pct.h / 100)
@@ -683,9 +708,9 @@ export function StepLlmReview({ sessionId, onNext }: StepLlmReviewProps) {
                         contentEditable
                         suppressContentEditableWarning
                         style={{
-                          left: `${cell.bbox_pct.x}%`,
+                          left: `${cellX}%`,
                           top: `${cell.bbox_pct.y}%`,
-                          width: `${cell.bbox_pct.w}%`,
+                          width: `${cellW}%`,
                           height: `${cell.bbox_pct.h}%`,
                           fontSize: `${fontSize}px`,
                           fontWeight: globalBold ? 'bold' : (cell.is_bold ? 'bold' : 'normal'),