Fix Grid Build step: show grid-editor summary instead of word_result

The Grid Build step was showing word_result.grid_shape (from the initial
OCR word clustering, often just 1 column) instead of the grid-editor
summary (zone-based, with correct column/row/cell counts). Now reads
summary.total_rows/total_columns/total_cells from the grid-editor result.

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

admin-lehrer/components/ocr-kombi/StepGridBuild.tsx

@@ -32,8 +32,10 @@ export function StepGridBuild({ sessionId, onNext }: StepGridBuildProps) {
       const res = await fetch(`${KLAUSUR_API}/api/v1/ocr-pipeline/sessions/${sessionId}/grid-editor`)
       if (res.ok) {
         const data = await res.json()
-        if (data.grid_shape) {
-          setResult({ rows: data.grid_shape.rows, cols: data.grid_shape.cols, cells: data.grid_shape.total_cells })
+        // Use grid-editor summary (accurate zone-based counts)
+        const summary = data.summary
+        if (summary) {
+          setResult({ rows: summary.total_rows || 0, cols: summary.total_columns || 0, cells: summary.total_cells || 0 })
           return
         }
       }
@@ -57,8 +59,14 @@ export function StepGridBuild({ sessionId, onNext }: StepGridBuildProps) {
         throw new Error(data.detail || `Grid-Build fehlgeschlagen (${res.status})`)
       }
       const data = await res.json()
-      const shape = data.grid_shape || { rows: 0, cols: 0, total_cells: 0 }
-      setResult({ rows: shape.rows, cols: shape.cols, cells: shape.total_cells })
+      // Use grid-editor summary (zone-based, more accurate than word_result.grid_shape)
+      const summary = data.summary
+      if (summary) {
+        setResult({ rows: summary.total_rows || 0, cols: summary.total_columns || 0, cells: summary.total_cells || 0 })
+      } else {
+        const shape = data.grid_shape || { rows: 0, cols: 0, total_cells: 0 }
+        setResult({ rows: shape.rows, cols: shape.cols, cells: shape.total_cells })
+      }
     } catch (e) {
       setError(e instanceof Error ? e.message : String(e))
     } finally {