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Axios + TanStack Query
UI never imports raw Axios. Feature code calls @/lib/api; Query owns cache; Nest owns truth.
Week 2 · data
Query key pattern
queryKey: ['notes', 'list', filters]
queryFn: () => notesApi.list(filters)
// after mutate → queryClient.invalidateQueries({ queryKey: noteKeys.lists() })Apply the same keys + invalidate pattern in the Week 4 Notes UI projects.