CONV-136: Test PNG to WEBP driver

[menvil]

Summary

• Adds failing test for PngToWebpDriver (implemented in CONV-137)

Test plan

• Test fails with "Target class does not exist" before implementation (expected)
• composer lint passes

🤖 Generated with Claude Code

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Summary by cubic

Add a feature test for PngToWebpDriver that verifies PNG to WEBP conversion: a file is written to storage with .webp extension, image/webp MIME type, and non-zero size. This sets the acceptance criteria for CONV-136 and will fail until the driver is implemented in CONV-137.

^{Written for commit 28e2648. 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-136-test-png-to-webp-driver

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