Delay ZetaJS loading with export modal

[erseco]

Summary

• add a lazy-loaded export modal for ZetaJS conversions in the document actions metabox
• enqueue new modal assets only in CDN mode and expose configuration to the browser
• style and script the modal to show progress steps and keep downloads in a hidden frame

Testing

• composer test (fails: phpunit not found in container)

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https://chatgpt.com/codex/tasks/task_e_68ecd0c229c88322be53bb4131ad0f38

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Do not mark iframe exports as done without verifying success

The modal’s load handler on the hidden export <iframe> sets each step to done whenever the frame finishes loading, regardless of whether the request actually produced a file. In CDN mode the export endpoints return a redirect with an error notice when ZetaJS conversions are unavailable, but because the request now runs inside the hidden frame the notice is invisible and the step shows as completed even though no download occurred. Users will see a successful state with no output and no explanation. Consider inspecting the iframe response (e.g. by checking headers or propagating the redirected URL to the main window) and displaying an error status instead of assuming every load event is a success.

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