[MKT-652]:feat/FileCompressor tool quality improve

[jaaaaavier]

Description

The file compressor had an issue with PDF compression where PDFs were only being compressed by 5% using basic pdf-lib optimization

After an investigation I found that we could improve easily the compressor by adding:
-Real Compression Logic: The compressPDF function only used useObjectStreams and addDefaultPage flags, which barely reduced file size
-A real Implementation: There was no dedicated PDF compression module, just a basic wrapper around pdf-lib's save function

Proposed Improve

1. Content Analysis: Detect whether PDFs contain selectable text or are scanned images
2. Dual Strategy Compression:
   • Text-based PDFs: Preserve document structure and text selectability
   • Image-based PDFs: Apply high-quality image compression with rendering

Implementation

Created a dedicated PDF compression module with multiple strategies:
1. Content Detection
- hasSelectableText(): Uses PDF.js to detect if PDF contains selectable text
- analyzePDFContent(): Analyzes PDF to determine optimal compression strategy
2. Compression Methods
1. Basic Optimization (for text-based PDFs):
- Removes metadata (title, author, subject, keywords, producer, creator)
- Enables object streams compression
- Preserves all text, links, and document structure
- Results in 5-15% compression while maintaining full functionality
2. Ultra Quality Rendering (for scanned PDFs):
- Renders each page to canvas at high resolution
- Supports PNG (lossless) or JPEG (high quality) output
- Implements 2x super-sampling for better anti-aliasing
- Uses high-quality image smoothing during rendering
- Results in 60-70% compression with good visual quality
3. Updated the main service to use the new module:

[vercel]

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Project	Deployment	Preview	Comments	Updated (UTC)
website	Ready	Preview	Comment	Nov 24, 2025 9:48am

[sonarqubecloud]

Quality Gate failed

Failed conditions
0.0% Coverage on New Code (required ≥ 80%)

See analysis details on SonarQube Cloud

[xabg2]

Check Sonar issues

[xabg2]

Also, consider creating a folder called compressor or something similar and add the files file-compressor and pdf-compressor to it. Also, rename the file pdfCompressor to match the pattern pdf-compressor.service.ts.