Adds checkbox column with select-all header, a selection action bar showing
count and "Delete X selected" (one confirm for the whole batch, sequential
delete with progress tracking), and a "Quick delete" checkbox that suppresses
the per-file confirm dialog for single-file deletes. Selection clears on
each new search. Designed for rapid orphan cleanup after Check Orphans.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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