- describe the implemented nested /import route structure
- document the route-local workflow store and stable draft state
- update testing, risk, and cleanup notes to match the current code
- 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