feat(ocr-pipeline): improve LLM review UI + add reconstruction step

StepLlmReview: Show full vocab table with image overlay, row-level
status tracking (pending/active/reviewed/corrected/skipped), and
auto-scroll during SSE streaming. Load previous results on mount.

StepReconstruction: New step 7 with editable text fields at original
bbox positions over dewarped image. Zoom controls, tab navigation,
color-coded columns, save to backend.

Backend: Add POST /sessions/{id}/reconstruction endpoint.

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

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

@@ -175,7 +175,7 @@ export default function OcrPipelinePage() {
       case 5:
         return <StepLlmReview sessionId={sessionId} onNext={handleNext} />
       case 6:
-        return <StepReconstruction />
+        return <StepReconstruction sessionId={sessionId} onNext={handleNext} />
       case 7:
         return <StepGroundTruth />
       default:

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

@@ -165,6 +165,14 @@ export interface GridResult {
     with_english?: number
     with_german?: number
   }
+  llm_review?: {
+    changes: { row_index: number; field: string; old: string; new: string }[]
+    model_used: string
+    duration_ms: number
+    entries_corrected: number
+    applied_count?: number
+    applied_at?: string
+  }
 }
 
 export interface WordEntry {