CONV-139: Implement JPG to WEBP driver

[menvil]

Summary

• Implements JpgToWebpDriver at app/Conversion/Drivers/Image/JpgToWebpDriver.php
• Decodes source JPG, encodes to WEBP with configurable quality using intervention/image GD driver
• Returns ConversionResult without mutating models

Test plan

• JpgToWebpDriverTest passes (file exists, extension=webp, mime=image/webp, size>0)
• composer test passes (262 tests)
• composer lint passes

🤖 Generated with Claude Code

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Summary by cubic

Implements JpgToWebpDriver (jpg_to_webp) to convert JPGs to WEBP with configurable quality. Satisfies CONV-139.

• New Features
  • JPG → WEBP conversion via intervention/image (GD).
  • Quality presets: low, medium, high, max (default: high).
  • Writes to local storage and returns ConversionResult; no model mutations.

^{Written for commit 59da5ba. 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-139-implement-jpg-to-webp-driver

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