switchlove / Artvee-Node-Scraper / 24379734008 / 1

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Achieve 93.16% test coverage with comprehensive sharp compression tests

- Install sharp as devDependency for full compression testing
- Add 14 comprehensive sharp compression tests covering:
  * JPEG, PNG, WebP format compression
  * Auto-detection of formats from metadata
  * Explicit format parameters (jpeg, jpg, png, webp)
  * Image resizing with width/height options
  * Error handling when compression fails
  * Input file validation
  * Formatted file size output
  * Default output path handling
- Mock sharp at module level for consistent testing
- Add test for partial marker cleanup after successful download

Test Results:
- 83 tests passing (was 74)
- Coverage: 93.16% statements (was 87.88%)
- Branches: 79.54%
- Functions: 89.18%
- Lines: 93.03%

Remaining uncovered: Progress bar rendering internals, sharp unavailable error

210 of 264 branches covered (79.55%)

Branch coverage included in aggregate %.

294 of 316 relevant lines covered (93.04%)

17.42 hits per line