fix: Zellen an Box-Zone clampen im Overlay-Modus (keine Ueberlappung)

Zellen oberhalb der Box werden in der Hoehe begrenzt, Zellen unterhalb
werden nach unten verschoben. Sub-Session-Zellen bleiben unveraendert.

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

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

@@ -476,6 +476,47 @@ export function StepReconstruction({ sessionId, onNext }: StepReconstructionProp
     )
   }
 
+  // Box zones in percent for clamping cell positions in overlay mode
+  const boxZonesPct = useMemo(() =>
+    parentZones
+      .filter(z => z.zone_type === 'box' && z.box)
+      .map(z => {
+        const imgH = imageNaturalSize?.h || 1
+        return {
+          topPct: (z.box!.y / imgH) * 100,
+          bottomPct: ((z.box!.y + z.box!.height) / imgH) * 100,
+        }
+      }),
+    [parentZones, imageNaturalSize]
+  )
+
+  // Clamp cell positions so they don't overlap with box zones
+  const adjustCellForBoxZones = (
+    bboxPct: { x: number; y: number; w: number; h: number },
+    cellId: string,
+  ): { x: number; y: number; w: number; h: number } => {
+    // Sub-session cells (inside box) → no adjustment
+    if (cellId.startsWith('sub_')) return bboxPct
+    if (boxZonesPct.length === 0) return bboxPct
+
+    const cellTop = bboxPct.y
+    const cellBottom = bboxPct.y + bboxPct.h
+    const cellCenter = cellTop + bboxPct.h / 2
+
+    for (const { topPct, bottomPct } of boxZonesPct) {
+      // Cell ABOVE box: clamp height so bottom doesn't exceed box top
+      if (cellCenter < topPct && cellBottom > topPct) {
+        return { ...bboxPct, h: topPct - cellTop }
+      }
+      // Cell BELOW box: push top down to box bottom
+      if (cellCenter > bottomPct && cellTop < bottomPct) {
+        const newY = bottomPct
+        return { ...bboxPct, y: newY, h: cellBottom - newY }
+      }
+    }
+    return bboxPct
+  }
+
   // Overlay rendering helper
   const renderOverlayMode = () => {
     const imgW = imageNaturalSize?.w || 1
@@ -562,7 +603,8 @@ export function StepReconstruction({ sessionId, onNext }: StepReconstructionProp
                 const displayText = getDisplayText(cell)
                 const edited = isEdited(cell)
                 const wordPos = cellWordPositions.get(cell.cellId)
-                const cellHeightPx = containerH * (cell.bboxPct.h / 100)
+                const adjBbox = adjustCellForBoxZones(cell.bboxPct, cell.cellId)
+                const cellHeightPx = containerH * (adjBbox.h / 100)
 
                 // Pixel-analysed: render word-groups at detected positions as inputs
                 if (wordPos && wordPos.length > 0) {
@@ -579,9 +621,9 @@ export function StepReconstruction({ sessionId, onNext }: StepReconstructionProp
                           className="absolute leading-none pointer-events-none select-none"
                           style={{
                             left: `${wp.xPct}%`,
-                            top: `${cell.bboxPct.y}%`,
+                            top: `${adjBbox.y}%`,
                             width: `${wp.wPct}%`,
-                            height: `${cell.bboxPct.h}%`,
+                            height: `${adjBbox.h}%`,
                             fontSize: `${fs}px`,
                             fontWeight: globalBold ? 'bold' : (cell.colType === 'column_en' ? 'bold' : 'normal'),
                             fontFamily: "'Liberation Sans', Arial, sans-serif",
@@ -601,9 +643,9 @@ export function StepReconstruction({ sessionId, onNext }: StepReconstructionProp
                     return (
                       <div key={`${cell.cellId}_wp_${i}`} className="absolute group" style={{
                         left: `${wp.xPct}%`,
-                        top: `${cell.bboxPct.y}%`,
+                        top: `${adjBbox.y}%`,
                         width: `${wp.wPct}%`,
-                        height: `${cell.bboxPct.h}%`,
+                        height: `${adjBbox.h}%`,
                       }}>
                         <input
                           id={`cell-${cell.cellId}`}
@@ -644,10 +686,10 @@ export function StepReconstruction({ sessionId, onNext }: StepReconstructionProp
                 const fontSize = Math.max(6, cellHeightPx * fontScale)
                 return (
                   <div key={cell.cellId} className="absolute group" style={{
-                    left: `${cell.bboxPct.x}%`,
+                    left: `${adjBbox.x}%`,
-                    top: `${cell.bboxPct.y}%`,
+                    top: `${adjBbox.y}%`,
-                    width: `${cell.bboxPct.w}%`,
+                    width: `${adjBbox.w}%`,
-                    height: `${cell.bboxPct.h}%`,
+                    height: `${adjBbox.h}%`,
                   }}>
                     <input
                       id={`cell-${cell.cellId}`}