Delete permanently removes a course from disk (confirmed with the full
path first) and cleans up any Hidden/Next Up/Recently Viewed
references to it. Ignore marks a specific pair as confirmed-not-
duplicates so it stops resurfacing in scans, without suppressing
either course's other matches; ignored pairs are listed and reversible
under "Ignored matches," and now travel with backup/restore.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
rmsitzandClaude Sonnet 5
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