Fixed url transformation of data-kg attributes

[allouis]

ref https://linear.app/ghost/issue/PRO-1548

We were incorrectly storing these attributes as absolute URLs in the DB due to them not being included in the allowlist.

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Note

Expands URL transformation coverage to Ghost-specific attributes so editor-stored HTML is normalized correctly.

• Add data-kg-background-image, data-kg-custom-thumbnail, and data-kg-thumbnail to transformAttributes in html-transform.ts
• New tests ensure these attributes are converted for absolute→transform-ready, relative→absolute, relative→transform-ready, and end-to-end htmlToTransformReady
• Verify protocol-relative handling, page-relative paths via itemPath, and ignoring transformations inside <code> blocks for these attributes

^{Written by Cursor Bugbot for commit a662810. This will update automatically on new commits. Configure here.}

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📥 Commits

Reviewing files that changed from the base of the PR and between 395b38c and a662810.

📒 Files selected for processing (5)

• packages/url-utils/src/utils/html-transform.ts
• packages/url-utils/test/unit/utils/html-absolute-to-transform-ready.test.js
• packages/url-utils/test/unit/utils/html-relative-to-absolute.test.js
• packages/url-utils/test/unit/utils/html-relative-to-transform-ready.test.js
• packages/url-utils/test/unit/utils/html-to-transform-ready.test.js

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[vershwal]

Looks good!