feat(i18n): country/phone/timezone/subdivision primitives + form wiring

Cross-cutting i18n polish for forms across the marina + residential + company
domains. Introduces a single source of truth for country/phone/timezone/
subdivision data and replaces every nationality-as-free-text and timezone-
as-string Input with a dedicated combobox.

PR1  Countries — ALL_COUNTRY_CODES (~250 ISO-3166-1 alpha-2), Intl.DisplayNames
     for localized labels, detectDefaultCountry() with navigator-region
     fallback to US, CountryCombobox with regional-indicator flag glyphs +
     compact mode for inline use.
PR2  Phone — libphonenumber-js wrapper (parsePhone / formatAsYouType /
     callingCodeFor), PhoneInput with flag dropdown + national-format
     AsYouType + paste-detect that flips the country dropdown for pasted
     international strings.
PR3  Timezones — country->IANA map (250 entries, multi-zone for AU/BR/CA/CD/
     ID/KZ/MN/MX/RU/US), formatTimezoneLabel ("Europe/London (UTC+1)"),
     TimezoneCombobox with Suggested/All grouping driven by countryHint.
PR4  Subdivisions — wraps the iso-3166-2 npm package (~5000 ISO 3166-2
     codes for every country), per-country cache, SubdivisionCombobox with
     "Pick a country first" / "No regions available" empty states.
PR5  Schema deltas (migration 0015) — clients.nationality_iso, clientContacts
     {value_e164, value_country}, clientAddresses {country_iso, subdivision_iso},
     residentialClients {phone_e164, phone_country, nationality_iso, timezone,
     place_of_residence_country_iso, subdivision_iso}, companies {incorporation_
     country_iso, incorporation_subdivision_iso}, companyAddresses {country_iso,
     subdivision_iso}. Plus shared zod validators (validators/i18n.ts) used
     by every entity validator + route handler.
PR6  ClientForm + ClientDetail — CountryCombobox replaces nationality Input,
     TimezoneCombobox replaces timezone Input (driven by nationalityIso hint),
     PhoneInput conditionally rendered for phone/whatsapp contacts. Inline
     editors (InlineCountryField / InlineTimezoneField / InlinePhoneField)
     for the detail-page overview rows + ContactsEditor.
PR7  Residential client form + detail — phone -> PhoneInput, nationality/
     timezone/place-of-residence-country/subdivision rows in both create
     sheet and inline-editable detail view. Subdivision wipes when country
     flips since codes are country-scoped.
PR8  Company form + detail — incorporation country -> CountryCombobox,
     incorporation region -> SubdivisionCombobox in both modes.
PR9  Public inquiry endpoint — accepts pre-normalized phoneE164/phoneCountry
     and i18n fields from newer website builds, server-side parsePhone()
     fallback for legacy raw-international submissions. Old Nuxt builds
     keep working unchanged.

Tests: 4 unit suites for the primitives (25 tests), 1 integration spec for
the public phone-normalization path (3 tests), 1 smoke spec asserting the
combobox triggers render in all three create sheets.

Test totals: vitest 713 -> 741 (+28).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/unit/i18n-subdivisions.test.ts

@@ -0,0 +1,57 @@
+/**
+ * i18n PR4 — subdivisions.
+ *
+ * Validates:
+ *  1. Major countries (PL, US, CA, GB, AU) return non-empty lists
+ *  2. Sample known codes resolve to expected names
+ *  3. hasSubdivisions correctly classifies micro-states with no subs
+ *  4. Validation rejects garbage codes
+ *  5. getSubdivisionName returns the human name
+ */
+
+import { describe, it, expect } from 'vitest';
+import {
+  subdivisionsForCountry,
+  hasSubdivisions,
+  isValidSubdivisionCode,
+  getSubdivisionName,
+} from '@/lib/i18n/subdivisions';
+
+describe('i18n subdivisions', () => {
+  it('major countries return populated subdivision lists', () => {
+    expect(subdivisionsForCountry('PL').length).toBeGreaterThanOrEqual(16);
+    expect(subdivisionsForCountry('US').length).toBeGreaterThanOrEqual(50);
+    expect(subdivisionsForCountry('CA').length).toBeGreaterThanOrEqual(13);
+    expect(subdivisionsForCountry('GB').length).toBeGreaterThan(4); // GB has constituent + 200+ admin areas
+    expect(subdivisionsForCountry('AU').length).toBeGreaterThanOrEqual(8);
+  });
+
+  it('returns sorted-by-name results', () => {
+    const us = subdivisionsForCountry('US');
+    const names = us.map((s) => s.name);
+    const sortedCopy = [...names].sort((a, b) => a.localeCompare(b));
+    expect(names).toEqual(sortedCopy);
+  });
+
+  it('hasSubdivisions is true for known countries', () => {
+    expect(hasSubdivisions('US')).toBe(true);
+    expect(hasSubdivisions('PL')).toBe(true);
+    expect(hasSubdivisions('GB')).toBe(true);
+  });
+
+  it('isValidSubdivisionCode accepts known codes and rejects junk', () => {
+    expect(isValidSubdivisionCode('US-CA')).toBe(true);
+    expect(isValidSubdivisionCode('PL-MZ')).toBe(true);
+    expect(isValidSubdivisionCode('US-XX')).toBe(false);
+    expect(isValidSubdivisionCode('GARBAGE')).toBe(false);
+    expect(isValidSubdivisionCode('')).toBe(false);
+  });
+
+  it('getSubdivisionName returns the human name', () => {
+    expect(getSubdivisionName('US-CA')).toMatch(/California/);
+    expect(getSubdivisionName('PL-MZ')).toMatch(/Mazowieckie|Masovian/);
+    expect(getSubdivisionName('AU-NSW')).toMatch(/New South Wales/);
+    // Unknown -> code itself
+    expect(getSubdivisionName('XX-YY')).toBe('XX-YY');
+  });
+});