# Tasks: Fix OCR Track Reflow PDF

## 1. Modify generate_reflow_pdf Method

- [x] 1.1 Add processing track detection
  - File: `backend/app/services/pdf_generator_service.py`
  - Location: `generate_reflow_pdf` method (line ~4704)
  - Read `metadata.processing_track` from JSON data
  - Branch logic based on track type

- [x] 1.2 Add helper function to load raw OCR regions
  - File: `backend/app/services/pdf_generator_service.py`
  - Using existing: `load_raw_ocr_regions` from `text_region_renderer.py`
  - Pattern: `{task_id}_*_page_{page_num}_raw_ocr_regions.json`
  - Return: List of text regions with bbox and content

- [x] 1.3 Implement OCR Track reflow rendering
  - File: `backend/app/services/pdf_generator_service.py`
  - For OCR Track: Load raw OCR regions per page
  - Sort text blocks by Y coordinate (top to bottom reading order)
  - Render text blocks as paragraphs
  - Still render images/charts from elements

- [x] 1.4 Keep Direct Track logic unchanged
  - File: `backend/app/services/pdf_generator_service.py`
  - Direct Track continues using `content.cells` for tables
  - Extracted to `_render_reflow_elements` helper method
  - No changes to existing Direct Track flow

## 2. Handle Multi-page Documents

- [x] 2.1 Support per-page raw OCR files
  - Pattern: `{task_id}_*_page_{page_num}_raw_ocr_regions.json`
  - Iterate through pages and load corresponding raw OCR file
  - Handle missing files gracefully (fall back to elements)

## 3. Testing

- [x] 3.1 Test OCR Track reflow PDF
  - Test with: `a9259180-fc49-4890-8184-2e6d5f4edad3` (scan document)
  - Verify: All 59 text blocks appear in reflow PDF
  - Verify: Images are embedded correctly

- [x] 3.2 Test Direct Track reflow PDF
  - Test with: `1b32428d-0609-4cfd-bc52-56be6956ac2e` (editable PDF)
  - Verify: Tables render with cells
  - Verify: No regression from changes

- [x] 3.3 Test translated reflow PDF
  - Test: Complete translation then download reflow PDF
  - Verify: Translated text appears correctly