Add batch duplicate review workflow

2026-07-01 16:18:30 -07:00
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+# Batch duplicate review
+
+## Problem
+
+Opening a diagnostic, opening each group again, scrolling to a separate repair
+form, and applying one change at a time creates unnecessary friction and many
+small backups.
+
+## Design
+
+Duplicate and cloud-conflict diagnostics now open as a sequential review queue.
+Each group presents its candidates together with audio preview and Finder
+controls. Choosing a keeper records the decision and advances immediately.
+Uncertain groups can be skipped without changing them.
+
+All approved decisions are submitted as one dry-run plan. Apply creates one
+backup containing every affected audio file plus the Serato metadata snapshot,
+then installs all compatibility shortcuts as one rollback unit. Any validation
+or filesystem failure prevents or rolls back the batch.
+
+## Edge cases
+
+- The same group cannot be submitted twice.
+- A file cannot be both a keeper and a disposable file across choices.
+- Every group is rescanned and revalidated before preview and apply.
+- Skipped and unreviewed groups remain untouched.
+- Revisiting a group preserves and visibly marks its selected keeper.
+
+## Tests
+
+- Two groups produce one backup and one restorable receipt.
+- Batch preview reports combined changes without modifying files.
+- Existing single-group repair remains a wrapper around the batch engine.