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>

src/lib/validators/i18n.ts

@@ -0,0 +1,78 @@
+/**
+ * Zod schemas wrapping the i18n primitives. Used by route handlers
+ * and form-level validation so the same rules run client + server.
+ */
+
+import { z } from 'zod';
+
+import { ISO_COUNTRIES } from '@/lib/i18n/countries';
+import { isValidE164 } from '@/lib/i18n/phone';
+import { isValidSubdivisionCode } from '@/lib/i18n/subdivisions';
+
+// ─── Country ──────────────────────────────────────────────────────────────────
+
+/** ISO-3166-1 alpha-2, uppercase. */
+export const countryIsoSchema = z
+  .string()
+  .length(2)
+  .toUpperCase()
+  .refine((c) => ISO_COUNTRIES.has(c), 'Unknown country code');
+
+// ─── Phone ────────────────────────────────────────────────────────────────────
+
+/** E.164 form, e.g. '+442079460958'. */
+export const phoneE164Schema = z
+  .string()
+  .min(1)
+  .refine((v) => isValidE164(v), 'Invalid phone number');
+
+// ─── Timezone ─────────────────────────────────────────────────────────────────
+
+/**
+ * IANA timezone (e.g. 'Europe/Warsaw'). Validates against
+ * `Intl.supportedValuesOf('timeZone')` when available. Older Node
+ * runtimes that lack the API fall back to a permissive shape check
+ * (`Region/City`) so the validator never blocks the path.
+ */
+export const ianaTimezoneSchema = z
+  .string()
+  .min(1)
+  .refine((tz) => {
+    if (typeof Intl !== 'undefined' && 'supportedValuesOf' in Intl) {
+      try {
+        const supported = Intl.supportedValuesOf('timeZone') as string[];
+        if (supported.length > 0) return supported.includes(tz);
+      } catch {
+        // fall through
+      }
+    }
+    return /^[A-Z][A-Za-z_+-]+\/[A-Za-z_+-]+/.test(tz);
+  }, 'Unknown timezone');
+
+// ─── Subdivision ──────────────────────────────────────────────────────────────
+
+/** ISO 3166-2 code, e.g. 'PL-MZ'. */
+export const subdivisionIsoSchema = z
+  .string()
+  .min(2)
+  .refine((code) => isValidSubdivisionCode(code), 'Unknown subdivision code');
+
+// ─── Optional variants ────────────────────────────────────────────────────────
+// Inline forms most callers will use — empty strings normalize to null
+// so the user clearing a field doesn't fail validation.
+
+export const optionalCountryIsoSchema = z
+  .union([z.literal(''), z.null(), countryIsoSchema])
+  .transform((v) => (v === '' || v === null ? null : v));
+
+export const optionalPhoneE164Schema = z
+  .union([z.literal(''), z.null(), phoneE164Schema])
+  .transform((v) => (v === '' || v === null ? null : v));
+
+export const optionalIanaTimezoneSchema = z
+  .union([z.literal(''), z.null(), ianaTimezoneSchema])
+  .transform((v) => (v === '' || v === null ? null : v));
+
+export const optionalSubdivisionIsoSchema = z
+  .union([z.literal(''), z.null(), subdivisionIsoSchema])
+  .transform((v) => (v === '' || v === null ? null : v));