feat(i18n): implement new locale resolution logic and service layer

server/i18n/locale.ts

@@ -1,28 +1,14 @@
 import type { TextDirection } from "../../lib/i18n";
+import {
+  directionForLocale as inferDirectionForLocale,
+  normalizeLocaleCode,
+} from "../../lib/i18n/locale-resolution";
 
-export const LOCALE_COOKIE = "neta_locale";
-export const LOCALE_COOKIE_MAX_AGE = 60 * 60 * 24 * 365;
 export const DEFAULT_TEXT_DIRECTION: TextDirection = "ltr";
 
-export function normalizeLocaleCode(value: string | null | undefined): string | null {
-  if (!value) return null;
-  const normalized = value.trim();
-  return /^[a-z]{2}(?:-[A-Z]{2}[0-9]?)?$/.test(normalized) ? normalized : null;
-}
+export { normalizeLocaleCode };
 
 export function directionForLocale(locale: string, explicit?: TextDirection | null): TextDirection {
   if (explicit) return explicit;
-  return /^(ar|fa|he|ur)(-|$)/.test(locale) ? "rtl" : DEFAULT_TEXT_DIRECTION;
-}
-
-export function buildLocaleCookie(value: string) {
-  return {
-    name: LOCALE_COOKIE,
-    value,
-    maxAge: LOCALE_COOKIE_MAX_AGE,
-    sameSite: "lax" as const,
-    path: "/",
-    httpOnly: false,
-    secure: process.env.NODE_ENV === "production",
-  };
+  return inferDirectionForLocale(locale) ?? DEFAULT_TEXT_DIRECTION;
 }