CONV-137: Implement PNG to WEBP driver

[menvil]

Summary

• Implements PngToWebpDriver at app/Conversion/Drivers/Image/PngToWebpDriver.php
• GD WEBP support confirmed (gd_info()['WebP Support'] = true)
• Supports quality option; lossless mode not exposed by GD encoder (lossy only)
• Returns ConversionResult without mutating models

Test plan

• PngToWebpDriverTest passes (file exists, extension=webp, mime=image/webp, size>0)
• composer test passes (261 tests)
• composer lint passes

🤖 Generated with Claude Code

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Summary by cubic

Adds a PNG→WEBP conversion driver to meet CONV-137, enabling lossy WebP output with configurable quality. This lets us convert stored PNGs to WebP and return a ConversionResult without touching models.

• New Features
  • Added PngToWebpDriver using intervention/image (GD) to encode WebP.
  • Supports quality option: low/medium/high/max (default fallback to 85).
  • Requires GD WebP support; encoder is lossy only.
  • Writes result.webp to the provided output directory on the local disk and returns ConversionResult with metadata.

^{Written for commit 6b32cde. 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-137-implement-png-to-webp-driver

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