feat(ocr-pipeline): add LLM-based OCR correction step (Step 6)

Replace the placeholder "Koordinaten" step with an LLM review step that
sends vocab entries to qwen3:30b-a3b via Ollama for OCR error correction
(e.g. "8en" → "Ben"). Teachers can review, accept/reject individual
corrections in a diff table before applying them.

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

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

@@ -8,7 +8,7 @@ import { StepDewarp } from '@/components/ocr-pipeline/StepDewarp'
 import { StepColumnDetection } from '@/components/ocr-pipeline/StepColumnDetection'
 import { StepRowDetection } from '@/components/ocr-pipeline/StepRowDetection'
 import { StepWordRecognition } from '@/components/ocr-pipeline/StepWordRecognition'
-import { StepCoordinates } from '@/components/ocr-pipeline/StepCoordinates'
+import { StepLlmReview } from '@/components/ocr-pipeline/StepLlmReview'
 import { StepReconstruction } from '@/components/ocr-pipeline/StepReconstruction'
 import { StepGroundTruth } from '@/components/ocr-pipeline/StepGroundTruth'
 import { PIPELINE_STEPS, type PipelineStep, type SessionListItem } from './types'
@@ -155,7 +155,7 @@ export default function OcrPipelinePage() {
     3: 'Spalten',
     4: 'Zeilen',
     5: 'Woerter',
-    6: 'Koordinaten',
+    6: 'LLM-Korrektur',
     7: 'Rekonstruktion',
     8: 'Validierung',
   }
@@ -173,7 +173,7 @@ export default function OcrPipelinePage() {
       case 4:
         return <StepWordRecognition sessionId={sessionId} onNext={handleNext} goToStep={goToStep} />
       case 5:
-        return <StepCoordinates />
+        return <StepLlmReview sessionId={sessionId} onNext={handleNext} />
       case 6:
         return <StepReconstruction />
       case 7:

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

@@ -208,7 +208,7 @@ export const PIPELINE_STEPS: PipelineStep[] = [
   { id: 'columns', name: 'Spalten', icon: '📊', status: 'pending' },
   { id: 'rows', name: 'Zeilen', icon: '📏', status: 'pending' },
   { id: 'words', name: 'Woerter', icon: '🔤', status: 'pending' },
-  { id: 'coordinates', name: 'Koordinaten', icon: '📍', status: 'pending' },
+  { id: 'llm-review', name: 'LLM-Korrektur', icon: '🤖', status: 'pending' },
   { id: 'reconstruction', name: 'Rekonstruktion', icon: '🏗️', status: 'pending' },
   { id: 'ground-truth', name: 'Validierung', icon: '✅', status: 'pending' },
 ]