fix(ocr-compare): Replace Ollama call in grid analysis with heuristic from comparison results

Ollama crashes when two concurrent vision requests hit the 32B model
(compare-ocr + analyze-grid). The grid analysis was redundantly calling
Ollama again even though compare-ocr already extracted all vocabulary.

- compare-ocr now saves vocabulary in session for reuse
- analyze-grid builds grid from session data (no Ollama, instant response)
- Grid button disabled until comparison results are available
- Added export-to-editor functionality

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

admin-v2/app/(admin)/ai/ocr-compare/page.tsx

@@ -139,6 +139,10 @@ export default function OCRComparePage() {
   const [currentBlockNumber, setCurrentBlockNumber] = useState(1)
   const [blockReviewData, setBlockReviewData] = useState<Record<number, BlockReviewData>>({})
 
+  // Export State
+  const [isExporting, setIsExporting] = useState(false)
+  const [exportSuccess, setExportSuccess] = useState(false)
+
   const KLAUSUR_API = '/klausur-api'
 
   // Load session history
@@ -535,6 +539,72 @@ export default function OCRComparePage() {
     }
   }, [gridData])
 
+  // Export to Worksheet Editor
+  const handleExportToEditor = useCallback(async () => {
+    if (!gridData || !sessionId) return
+
+    setIsExporting(true)
+    setExportSuccess(false)
+
+    try {
+      // Convert grid cells (percent coordinates) to mm for A4
+      const A4_WIDTH_MM = 210
+      const A4_HEIGHT_MM = 297
+
+      const words = gridData.cells.flat()
+        .filter(cell => cell.status !== 'empty' && cell.text)
+        .map(cell => ({
+          text: cell.text,
+          x_mm: (cell.x / 100) * A4_WIDTH_MM,
+          y_mm: (cell.y / 100) * A4_HEIGHT_MM,
+          width_mm: (cell.width / 100) * A4_WIDTH_MM,
+          height_mm: (cell.height / 100) * A4_HEIGHT_MM,
+          column_type: cell.column_type || 'unknown',
+          logical_row: cell.row,
+          confidence: cell.confidence,
+        }))
+
+      const detectedColumns = gridData.column_types.map((type, idx) => ({
+        column_type: type,
+        x_start_mm: (gridData.column_boundaries[idx] / 100) * A4_WIDTH_MM,
+        x_end_mm: (gridData.column_boundaries[idx + 1] / 100) * A4_WIDTH_MM,
+      }))
+
+      const exportData = {
+        version: '1.0',
+        source: 'ocr-compare',
+        exported_at: new Date().toISOString(),
+        session_id: sessionId,
+        page_number: selectedPage + 1,
+        page_dimensions: {
+          width_mm: A4_WIDTH_MM,
+          height_mm: A4_HEIGHT_MM,
+          format: 'A4',
+        },
+        words,
+        detected_columns: detectedColumns,
+      }
+
+      const res = await fetch(
+        `${KLAUSUR_API}/api/v1/vocab/sessions/${sessionId}/ocr-export/${selectedPage + 1}`,
+        {
+          method: 'POST',
+          headers: { 'Content-Type': 'application/json' },
+          body: JSON.stringify(exportData),
+        }
+      )
+
+      if (res.ok) {
+        setExportSuccess(true)
+        setTimeout(() => setExportSuccess(false), 3000)
+      }
+    } catch (e) {
+      console.error('Export failed:', e)
+    } finally {
+      setIsExporting(false)
+    }
+  }, [gridData, sessionId, selectedPage, KLAUSUR_API])
+
   // Count non-empty blocks
   const nonEmptyBlockCount = useMemo(() => {
     if (!gridData) return 0
@@ -831,6 +901,35 @@ export default function OCRComparePage() {
                       )}
                     </button>
                   )}
+
+                  {/* Export to Editor Button */}
+                  <button
+                    onClick={handleExportToEditor}
+                    disabled={isExporting}
+                    className={`w-full px-4 py-2 rounded-lg font-medium text-sm transition-colors ${
+                      exportSuccess
+                        ? 'bg-green-100 text-green-700'
+                        : 'bg-green-600 text-white hover:bg-green-700'
+                    }`}
+                  >
+                    <span className="flex items-center justify-center gap-2">
+                      {isExporting ? (
+                        <svg className="animate-spin w-4 h-4" fill="none" viewBox="0 0 24 24">
+                          <circle className="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" strokeWidth="4" />
+                          <path className="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z" />
+                        </svg>
+                      ) : exportSuccess ? (
+                        <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M5 13l4 4L19 7" />
+                        </svg>
+                      ) : (
+                        <svg className="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
+                          <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 16v1a3 3 0 003 3h10a3 3 0 003-3v-1m-4-8l-4-4m0 0L8 8m4-4v12" />
+                        </svg>
+                      )}
+                      {exportSuccess ? 'Exportiert!' : 'Zum Editor exportieren'}
+                    </span>
+                  </button>
                 </div>
               )}
             </div>
@@ -1015,11 +1114,25 @@ export default function OCRComparePage() {
                       </div>
                       <div className="p-4">
                         {thumbnails[selectedPage] ? (
-                          <img
-                            src={thumbnails[selectedPage]}
-                            alt={`Seite ${selectedPage + 1}`}
-                            className={`rounded-lg border border-slate-200 ${isFullscreen ? 'max-h-[80vh] mx-auto' : 'w-full max-w-2xl mx-auto'}`}
-                          />
+                          gridData && showGridOverlay ? (
+                            <GridOverlay
+                              grid={gridData}
+                              imageUrl={thumbnails[selectedPage]}
+                              onCellClick={handleCellClick}
+                              selectedCell={selectedCell}
+                              showEmpty={false}
+                              showNumbers={blockReviewMode}
+                              showTextLabels={true}
+                              highlightedBlockNumber={blockReviewMode ? currentBlockNumber : null}
+                              className={`rounded-lg border border-slate-200 overflow-hidden ${isFullscreen ? 'max-h-[80vh] mx-auto' : 'w-full max-w-2xl mx-auto'}`}
+                            />
+                          ) : (
+                            <img
+                              src={thumbnails[selectedPage]}
+                              alt={`Seite ${selectedPage + 1}`}
+                              className={`rounded-lg border border-slate-200 ${isFullscreen ? 'max-h-[80vh] mx-auto' : 'w-full max-w-2xl mx-auto'}`}
+                            />
+                          )
                         ) : (
                           <div className="h-96 bg-slate-100 rounded-lg flex items-center justify-center text-slate-500">
                             Kein Bild verfuegbar
@@ -1116,6 +1229,7 @@ export default function OCRComparePage() {
                                 selectedCell={selectedCell}
                                 showEmpty={false}
                                 showNumbers={blockReviewMode}
+                                showTextLabels={!blockReviewMode}
                                 highlightedBlockNumber={blockReviewMode ? currentBlockNumber : null}
                                 className="rounded-lg border border-slate-200 overflow-hidden"
                               />