The 'retag' fix corrects a mismatched file's tags/DB but leaves it in the WRONG
artist/album folder, so the library shows the right title while the file sits under
the previous track. AcoustID yields only title+artist (no reliable album), so an
in-place move has no safe target.
New 'relocate' action: retag the file, move it into Staging, drop the stale tracks
row, and clean up the emptied folder. The auto-import worker (which watches Staging)
re-identifies it with full metadata and files it correctly — reusing the import
pipeline instead of guessing a destination.
- core/repair_jobs/relocate.py: pure, injectable orchestration (retag -> move ->
drop row) + collision-safe staging_destination. Row is dropped only AFTER a
successful move, so a failed move never orphans the library entry.
- _fix_acoustid_mismatch gains the 'relocate' branch (thin wrapper: resolve path,
staging dir, drop-row closure, empty-parent cleanup).
- UI: "Relocate" button on the AcoustID-mismatch fix modal.
Tests (8): staging-dest collision suffixing; relocate happy path; tag-write failure
still relocates; FAILED move does NOT drop the row; no-tags skips write; a real
file move through safe_move_file; and a handler integration test (file moved to
staging + tracks row deleted end-to-end). Repair + integrity suites green.
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