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: