frontend phase 3: geography — addresses, map-pin picker & nurse coverage areas

Three domain services (mirroring the patients/nurse template): services/geography
(cached province→city→district lookups; Infinity staleTime + shared geographyKeys),
services/addresses (address book CRUD + set-primary; single-primary invariant), and
services/serviceAreas (coverage add/remove; areaExists dup-guard, districtId=null = whole city).

Four tested composites in src/components/geography: CascadingRegionSelect (drives the
cascade queries), AddressMapPicker (map-pin stand-in emitting real lat/lng), AddressForm,
AddressCard. Screens: customer address book (/addresses, reached from the profile hub) and
nurse coverage editor (/nurse/coverage, new sidebar tab, inline duplicate block + 409).

Adds geo/address/coverage i18n namespaces (both locales), location/delete/coverage icons,
ADDRESSES/NURSE_COVERAGE routes. Consumes the b4 geography-addresses contract; filed REQ-008
(accept the map pin on create/update) and REQ-009 (provinceId on CustomerAddressDto) for gaps.

Gate: npm run check + npm run test:ci (129, +17) + npm run build all green. A 5-dimension
adversarial review fixed 3 findings (map-marker RTL transform, page_size→pageSize pagination
casing, coverage districts-scope dead-end on district-less cities).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

client/src/layout/NurseLayout.tsx

@@ -19,6 +19,7 @@ const NurseLayout: FunctionComponent<PropsWithChildren> = ({ children }) => {
     () => [
       { title: t('dashboard'), path: ROUTES.NURSE, icon: 'dashboard' },
       { title: t('profile'), path: ROUTES.NURSE_PROFILE, icon: 'profile' },
+      { title: t('coverage'), path: ROUTES.NURSE_COVERAGE, icon: 'coverage' },
       { title: t('bank'), path: ROUTES.NURSE_BANK, icon: 'bank' },
       { title: t('verification'), path: ROUTES.NURSE_VERIFICATION, icon: 'verification' },
       { title: t('visits'), path: ROUTES.NURSE_VISITS, icon: 'visits' },