The duplicate (file-hash) error path returned an importId but the UI only
captured it for the duplicate_period branch, so users saw a misleading
"ta bort under Bokföring" message with no way to act on it. The replace
flow (and its BFL 5:5 audit trail) is identical in both cases, so expose
the existing button for both.
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>