load_for_file no longer runs three DB queries on the UI thread during file
load. A _ScanLoadWorker reads the bundle (hard negatives, scan-export times,
latest scan results) via its own short-lived connection — safe alongside the
main connection now that WAL is on. The table rebuild stays on the UI thread
in _on_scan_bundle_loaded; the timeline scan regions are synced from the new
loaded(filename) signal. Stale results from rapid file switches are ignored,
and the worker is drained on shutdown.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
EthanfelandClaude Opus 4.6
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