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>
Remove Companion module entirely from admin-v2. Rebuild in studio-v2 as a
focused lesson timer (no dashboard mode). Direct flow: start → active → ended.
Fix timer bug where lastTickRef reset prevented countdown. Add companion link
to Sidebar and i18n translations.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>