fix: Overlay-Zellen ohne _heal_row_gaps positionieren (skip_heal_gaps)

_heal_row_gaps verschiebt Zell-Positionen nach Entfernung von Artefakt-Zeilen,
was im Overlay zu sichtbarem Versatz fuehrt (z.B. 23px bei "badge").
Neuer skip_heal_gaps Parameter in build_cell_grid_v2 und words-Endpoint
behaelt die exakten Zeilen-Positionen bei.

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

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

@@ -44,9 +44,11 @@ interface StepWordRecognitionProps {
   sessionId: string | null
   onNext: () => void
   goToStep: (step: number) => void
+  /** Skip _heal_row_gaps in cell grid (better overlay positioning) */
+  skipHealGaps?: boolean
 }
 
-export function StepWordRecognition({ sessionId, onNext, goToStep }: StepWordRecognitionProps) {
+export function StepWordRecognition({ sessionId, onNext, goToStep, skipHealGaps = false }: StepWordRecognitionProps) {
   const [gridResult, setGridResult] = useState<GridResult | null>(null)
   const [detecting, setDetecting] = useState(false)
   const [error, setError] = useState<string | null>(null)
@@ -110,7 +112,7 @@ export function StepWordRecognition({ sessionId, onNext, goToStep }: StepWordRec
       let res: Response | null = null
       for (let attempt = 0; attempt < 2; attempt++) {
         res = await fetch(
-          `${KLAUSUR_API}/api/v1/ocr-pipeline/sessions/${sessionId}/words?stream=true&engine=${eng}&pronunciation=${pronunciation}`,
+          `${KLAUSUR_API}/api/v1/ocr-pipeline/sessions/${sessionId}/words?stream=true&engine=${eng}&pronunciation=${pronunciation}${skipHealGaps ? '&skip_heal_gaps=true' : ''}`,
           { method: 'POST' },
         )
         if (res.ok) break