Add gutter repair step to OCR Kombi pipeline

New step "Wortkorrektur" between Grid-Review and Ground Truth that detects
and fixes words truncated or blurred at the book gutter (binding area) of
double-page scans. Uses pyspellchecker (DE+EN) for validation.

Two repair strategies:
- hyphen_join: words split across rows with missing chars (ve + künden → verkünden)
- spell_fix: garbled trailing chars from gutter blur (stammeli → stammeln)

Interactive frontend with per-suggestion accept/reject and batch controls.

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

admin-lehrer/app/(admin)/ai/ocr-kombi/page.tsx

@@ -15,6 +15,7 @@ import { StepOcr } from '@/components/ocr-kombi/StepOcr'
 import { StepStructure } from '@/components/ocr-kombi/StepStructure'
 import { StepGridBuild } from '@/components/ocr-kombi/StepGridBuild'
 import { StepGridReview } from '@/components/ocr-kombi/StepGridReview'
+import { StepGutterRepair } from '@/components/ocr-kombi/StepGutterRepair'
 import { StepGroundTruth } from '@/components/ocr-kombi/StepGroundTruth'
 import { useKombiPipeline } from './useKombiPipeline'
 
@@ -93,6 +94,8 @@ function OcrKombiContent() {
       case 9:
         return <StepGridReview sessionId={sessionId} onNext={handleNext} saveRef={gridSaveRef} />
       case 10:
+        return <StepGutterRepair sessionId={sessionId} onNext={handleNext} />
+      case 11:
         return (
           <StepGroundTruth
             sessionId={sessionId}

admin-lehrer/app/(admin)/ai/ocr-kombi/types.ts

@@ -39,6 +39,7 @@ export const KOMBI_V2_STEPS: PipelineStep[] = [
   { id: 'structure',     name: 'Strukturerkennung',  icon: '🔍', status: 'pending' },
   { id: 'grid-build',    name: 'Grid-Aufbau',        icon: '🧱', status: 'pending' },
   { id: 'grid-review',   name: 'Grid-Review',        icon: '📊', status: 'pending' },
+  { id: 'gutter-repair', name: 'Wortkorrektur',      icon: '🩹', status: 'pending' },
   { id: 'ground-truth',  name: 'Ground Truth',       icon: '✅', status: 'pending' },
 ]
 
@@ -54,7 +55,8 @@ export const KOMBI_V2_UI_TO_DB: Record<number, number> = {
   7: 9,   // structure
   8: 10,  // grid-build
   9: 11,  // grid-review
-  10: 12, // ground-truth
+  10: 11, // gutter-repair (shares DB step with grid-review)
+  11: 12, // ground-truth
 }
 
 /** Map from DB step to Kombi V2 UI step index */
@@ -68,7 +70,7 @@ export function dbStepToKombiV2Ui(dbStep: number): number {
   if (dbStep === 9) return 7  // structure
   if (dbStep === 10) return 8 // grid-build
   if (dbStep === 11) return 9 // grid-review
-  return 10                   // ground-truth
+  return 11                   // ground-truth
 }
 
 /** Document group: groups multiple sessions from a multi-page upload */

admin-lehrer/app/(admin)/ai/ocr-kombi/useKombiPipeline.ts

@@ -129,9 +129,12 @@ export function useKombiPipeline() {
       const hasGrid = !!data.grid_editor_result
       const hasStructure = !!data.structure_result
       const hasWords = !!data.word_result
+      const hasGutterRepair = !!(data.ground_truth?.gutter_repair)
 
       let uiStep: number
-      if (hasGrid) {
+      if (hasGrid && hasGutterRepair) {
+        uiStep = 10 // gutter-repair (already analysed)
+      } else if (hasGrid) {
         uiStep = 9 // grid-review
       } else if (hasStructure) {
         uiStep = 8 // grid-build