- Add BatchState management in taskStore with progress tracking
- Implement batch processing service with concurrency control
- Direct Track: max 5 parallel tasks
- OCR Track: sequential processing (GPU VRAM limit)
- Refactor ProcessingPage to support batch mode with BatchProcessingPanel
- Update UploadPage to initialize batch state for multi-file uploads
- Add i18n translations for batch processing (zh-TW, en-US)
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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