Bite-sized tasks with exact code blocks:
- Task 1: navigatorUiStore (TDD, 14 cases)
- Task 2: useDoorState extraction (TDD, 11 cases incl. dual-subscription filters)
- Task 3: useNavigatorStore internal closure (move all non-door listeners + new actions)
- Task 4: 3 filters + barrel rewrite + smoke test
- Tasks 5-8: 13 consumer migrations (atomic commit)
- Task 9: delete useNavigator.ts + final verification (typecheck/test/lint/manual)
Each commit is a green stopping point except Task 4 step 8 (intentional
intermediate-broken commit while consumers still import the removed
useNavigator export from the barrel). Tasks 5-8 land atomically to close
that gap in the next commit.
simoleo89