Locations store State as either a two-letter postal code or a full state
name (the location list filter expands codes to both forms via
UsStateCodes.ExpandStorageValues, and dev fixtures carry State = "indiana").
DashboardRegions.Resolve only matched the two-letter key, so every location
stored as a full name fell into Unmapped/Other and the East/Central/West/
California bars undercounted.
Normalise the stored value through a new UsStateCodes.ToCode, which accepts a
code or a full name and returns the canonical postal code, before the zone
lookup. Extend the region test with full-name storage forms and add an
invariant asserting every US state and its full-name form resolves to a
canonical bucket.
