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-phone.test.ts

@@ -0,0 +1,60 @@
+/**
+ * i18n PR2 — phone helpers.
+ *
+ * Validates:
+ *  1. parsePhone yields E.164 + country + display formats
+ *  2. parsePhone returns the empty record for unparseable input
+ *  3. AsYouType formats digits in the country's national style
+ *  4. isValidE164 accepts only E.164 form
+ *  5. callingCodeFor returns the dial prefix
+ *  6. International-format paste detects country
+ */
+
+import { describe, it, expect } from 'vitest';
+import { parsePhone, formatAsYouType, isValidE164, callingCodeFor } from '@/lib/i18n/phone';
+
+describe('i18n phone', () => {
+  it('parses an international-format input regardless of defaultCountry', () => {
+    const r = parsePhone('+44 20 7946 0958');
+    expect(r.e164).toBe('+442079460958');
+    expect(r.country).toBe('GB');
+    expect(r.isValid).toBe(true);
+    expect(r.national).toMatch(/020 7946 0958/);
+    expect(r.international).toMatch(/\+44 20 7946 0958/);
+  });
+
+  it('parses a national-format input against the defaultCountry', () => {
+    const r = parsePhone('020 7946 0958', 'GB');
+    expect(r.e164).toBe('+442079460958');
+    expect(r.country).toBe('GB');
+    expect(r.isValid).toBe(true);
+  });
+
+  it('returns the empty record for empty / nonsense input', () => {
+    expect(parsePhone('').isValid).toBe(false);
+    expect(parsePhone('abc').isValid).toBe(false);
+    expect(parsePhone('').e164).toBeNull();
+  });
+
+  it('formatAsYouType produces national-format output', () => {
+    // GB national-format breaks 020 7946 0958.
+    const out = formatAsYouType('2079460958', 'GB');
+    expect(out.length).toBeGreaterThan(0);
+    // US national-format breaks (415) 555-1234.
+    const us = formatAsYouType('4155551234', 'US');
+    expect(us).toContain('415');
+  });
+
+  it('isValidE164 accepts only E.164', () => {
+    expect(isValidE164('+442079460958')).toBe(true);
+    expect(isValidE164('+1 415 555 1234')).toBe(true); // libphonenumber tolerates spaces
+    expect(isValidE164('020 7946 0958')).toBe(false); // missing +country prefix
+    expect(isValidE164('not a phone')).toBe(false);
+  });
+
+  it('callingCodeFor returns the dial prefix', () => {
+    expect(callingCodeFor('US')).toBe('+1');
+    expect(callingCodeFor('GB')).toBe('+44');
+    expect(callingCodeFor('PL')).toBe('+48');
+  });
+});