# Change: Fix PDF Table Rendering Issues

## Why
OCR track PDF exports have significant table rendering problems:
1. **Reflow PDF** (both translated and untranslated): Tables are misaligned due to missing row_span/col_span support
2. **Translated Layout PDF**: Table borders disappear and text overlaps because it doesn't use the accurate `cell_boxes` positioning

## What Changes
- **Translated Layout PDF**: Adopt layered rendering approach (borders + text separately) using `cell_boxes` from metadata
- **Reflow PDF Tables**: Fix cell extraction and add basic merged cell support
- Ensure embedded images in tables are rendered correctly in all PDF formats

## Impact
- Affected specs: result-export
- Affected code:
  - `backend/app/services/pdf_generator_service.py`
    - `_draw_translated_table()` - needs complete rewrite
    - `_create_reflow_table()` - needs merged cell support
