24253ac15e
Backend changes: - Apply background image + invisible text layer to all Direct Track PDFs - Add CHART to regions_to_avoid for text extraction - Improve visual fidelity for native PDFs and Office documents Frontend changes: - Remove JSON, UnifiedDocument, Markdown download buttons - Simplify to 2-column layout with only Layout PDF and Reflow PDF - Remove translation JSON download and Layout PDF option - Keep only Reflow PDF for translated document downloads - Clean up unused imports (FileJson, Database, FileOutput) Archives two OpenSpec proposals: - unify-direct-track-pdf-rendering - simplify-frontend-export-options 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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MODIFIED Requirements
Requirement: Enhanced PDF Export with Layout Preservation
The PDF export SHALL accurately preserve document layout from both OCR and direct extraction tracks with correct coordinate transformation and multi-page support. For Direct Track, a background image rendering approach SHALL be used for visual fidelity.
Scenario: Export PDF from direct extraction track
- WHEN exporting PDF from a direct-extraction processed document
- THEN the system SHALL render source PDF pages as full-page background images at 2x resolution
- AND overlay invisible text elements using PDF Text Rendering Mode 3
- AND text SHALL remain selectable and searchable despite being invisible
- AND visual output SHALL match source document exactly
Scenario: Export PDF from OCR track with full structure
- WHEN exporting PDF from OCR-processed document
- THEN the PDF SHALL use all 23 PP-StructureV3 element types
- AND render tables with proper cell boundaries
- AND maintain reading order from parsing_res_list
Scenario: Handle coordinate transformations correctly
- WHEN generating PDF from UnifiedDocument
- THEN system SHALL use explicit page dimensions from OCR results (not inferred from bounding boxes)
- AND correctly transform Y-axis coordinates from top-left (OCR) to bottom-left (PDF/ReportLab) origin
- AND prevent vertical flipping or position misalignment errors
Scenario: Direct Track PDF file size increase
- WHEN generating Layout PDF for Direct Track documents
- THEN the system SHALL accept increased file size due to embedded page images
- AND approximately 1-2 MB per page at 2x resolution is expected
- AND this trade-off is accepted for improved visual fidelity
Scenario: Chart elements excluded from text layer
- WHEN generating Layout PDF containing charts
- THEN the system SHALL NOT include chart-internal text in the invisible text layer
- AND chart visuals SHALL be preserved in the background image
- AND chart text SHALL NOT be available for text selection or translation