feat(worksheet-editor): Add OCR import panel for grid analysis data

Add OCRImportPanel component and ocr-integration utilities to import
OCR-analyzed data from the grid detection service into the worksheet editor.

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

studio-v2/components/worksheet-editor/index.ts

@@ -13,3 +13,4 @@ export { PageNavigator } from './PageNavigator'
 export { ExportPanel } from './ExportPanel'
 export { DocumentImporter } from './DocumentImporter'
 export { CleanupPanel } from './CleanupPanel'
+export { OCRImportPanel } from './OCRImportPanel'