Apply the keep-until-next-scan behaviour to deleteSubjectItems: mark the
deleted items _deleted (using deleted_ids from the response) and keep them
greyed in the grid instead of filtering them out. Also fixes a latent bug
where renderGrid() was called with no argument and threw on files.forEach,
which the surrounding try/catch swallowed as a false "Delete failed" after a
successful erasure.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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