feat(i18n): Hebrew locale + full RTL support

i18n/request.ts

@@ -1,11 +1,33 @@
 import { getRequestConfig } from 'next-intl/server';
+import { headers } from 'next/headers';
+import { mergeMessages } from './merge-messages';
 import { routing, type Locale } from './routing';
 
+// Default a first-time visitor (no explicit stored choice) to the best supported
+// language from their browser's Accept-Language header, so "Auto" is the real
+// default and the first server render already matches the browser language.
+function localeFromAcceptLanguage(header: string | null): string | null {
+  if (!header) return null;
+  const supported = new Set<string>(routing.locales as readonly string[]);
+  const ranked = header
+    .split(',')
+    .map((part) => {
+      const [tag, q] = part.trim().split(';q=');
+      return { base: tag.toLowerCase().split('-')[0], q: q ? parseFloat(q) : 1 };
+    })
+    .sort((a, b) => b.q - a.q);
+  for (const { base } of ranked) {
+    if (supported.has(base)) return base;
+  }
+  return null;
+}
+
 export default getRequestConfig(async ({ requestLocale }) => {
   let locale = await requestLocale;
 
   if (!locale || !routing.locales.includes(locale as Locale)) {
-    locale = routing.defaultLocale;
+    const accept = (await headers()).get('accept-language');
+    locale = localeFromAcceptLanguage(accept) ?? routing.defaultLocale;
   }
 
   // Use static imports for better compatibility
@@ -23,6 +45,9 @@ export default getRequestConfig(async ({ requestLocale }) => {
     case 'es':
       messages = (await import('../locales/es/common.json')).default;
       break;
+    case 'he':
+      messages = (await import('../locales/he/common.json')).default;
+      break;
     case 'fa':
       messages = (await import('../locales/fa/common.json')).default;
       break;
@@ -75,6 +100,11 @@ export default getRequestConfig(async ({ requestLocale }) => {
       messages = (await import('../locales/en/common.json')).default;
   }
 
+  if (locale !== 'en') {
+    const enBase = (await import('../locales/en/common.json')).default as Record<string, unknown>;
+    messages = mergeMessages(enBase, messages as Record<string, unknown>);
+  }
+
   return {
     locale,
     messages,