- keep the /import loader from turning transient staging fetch failures into route errors
- keep cached auto-import status and results visible during refetch failures
- show inline notices only when there is no stale data to fall back to
- add regression coverage for staging, status, and results failure paths
- Move import page, tabs, workflow state, and route tests into React-owned route slices
- Preserve shell gating, staging queries, album matching, singles matching, auto-import, and queue behavior
- Add migration plan snapshot so cleanup/refinement can build on a stable baseline
