Enable SingleFile deferred image loading by default

[dicnunz]

Summary

• add --load-deferred-images-dispatch-scroll-event to the default SingleFile CLI args
• cover the default with a small config regression test

Fixes ArchiveBox/ArchiveBox#318.

Context

The issue was opened in ArchiveBox/ArchiveBox, but the current SingleFile plugin config lives in this repo. The existing SINGLEFILE_ARGS setting still lets users override the defaults if scroll events cause page-specific side effects.

Verification

• python3 -m json.tool abx_plugins/plugins/singlefile/config.json >/dev/null
• uv run pytest abx_plugins/plugins/singlefile/tests/test_singlefile_config.py -q
• git diff --check

Paid-fix note

If this closes the deferred-image loading gap and saves maintainer time, I am asking $10 here: https://nicdunz.gumroad.com/l/tiny-codex-teardown-direct?wanted=true

No issue if this project only handles volunteer contributions; the patch stands either way.

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Summary by cubic

Enable deferred image loading in SingleFile by default to capture lazy-loaded images reliably. Adds the scroll-dispatch flag to the default args and a regression test to prevent regressions.

• Bug Fixes
  • Add --load-deferred-images-dispatch-scroll-event to default SINGLEFILE_ARGS.
  • Add test to assert the flag is present in the plugin config.

^{Written for commit 4d315e0. Summary will update on new commits. Review in cubic}

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[cubic-dev-ai]

No issues found across 2 files

_{Re-trigger cubic}