Replace Jimp

[wswebcreation]

Why

jimp is no longer actively maintained, t has seen no releases in over a year and shows minimal PR/issue activity. It was originally chosen to avoid the system-level install requirements of node-canvas (GTK, Cairo, etc.), but it now carries its own maintenance risk.

This PR replaces jimp with an approach that keeps the same guarantee, no binary dependencies, no OS-level installs, pure JavaScript, while using actively maintained libraries. The image codec is replaced by fast-png (v8.0.0, maintained by the image-js / Zakodium org), and all image manipulation operations are implemented as a small in-house utility module that operates directly on raw RGBA pixel buffers.

User impact

There are no intentional behaviour changes for end users. The visual comparison results, blockout regions, full-page screenshot assembly, and device rotation handling all operate identically. The compareEngine the is introduced in the branch we are going merge this in will be removed. We believe that we can merge this as a major release without too much impact for users.

Baseline compatibility

This PR is being validated against baselines that were originally generated with jimp to confirm that the pixel-level output of the new implementation is identical. Any regression there would indicate a bug in the pure-JS pixel operations (crop, composite, rotate, resize) that needs to be addressed before merging.

[changeset-bot]

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Latest commit: 069f8ea

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