CONV-133: Implement PNG to JPG driver

[menvil]

Summary

• Implements PngToJpgDriver at app/Conversion/Drivers/Image/PngToJpgDriver.php
• Uses intervention/image GD driver to decode source PNG, fill transparent areas with background color, encode to JPEG
• Supports quality option (low/medium/high/max → 60/75/90/100) and background hex color
• Driver returns ConversionResult and does not mutate any models

Test plan

• tests/Feature/Conversion/Drivers/PngToJpgDriverTest.php passes (verifies file exists, extension, mime, size)
• composer test passes (259 tests)
• composer lint passes
• npm run build passes

🤖 Generated with Claude Code

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Summary by cubic

Adds PngToJpgDriver to convert PNGs to JPEG with transparency fill and quality presets. Addresses CONV-133 by providing a reliable PNG→JPG conversion path.

• New Features
  • Uses intervention/image GD driver to decode PNG, fill transparent areas, and encode JPG.
  • Supports quality option: low/medium/high/max → 60/75/90/100 (default 85).
  • Supports background hex color for transparency fill (default #ffffff).
  • Outputs result.jpg to the provided directory and returns a ConversionResult.

^{Written for commit 024f712. Summary will update on new commits.}

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/CONV-133-implement-png-to-jpg-driver

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