Fix runtime default locale resolution

app/[locale]/(site)/portfolio/[slug]/page.tsx

@@ -5,8 +5,9 @@ import { notFound } from "next/navigation";
 import { Container } from "@/components/layout/container";
 import { PageHero } from "@/components/layout/page-hero";
 import { PortfolioProjectDetail } from "@/components/site/portfolio-project-detail";
+import { getSiteSettings } from "@/lib/app-config";
 import { buildLocalizedMetadata } from "@/lib/metadata";
-import { resolveLocale } from "@/lib/locale";
+import { FALLBACK_LOCALE, resolveLocale } from "@/lib/locale";
 import {
   getLocalizedValue,
   getPublishedPortfolioProjectBySlug,
@@ -23,7 +24,7 @@ export const dynamic = "force-dynamic";
 
 export async function generateMetadata({ params }: PortfolioItemPageProps): Promise<Metadata> {
   const { locale, slug } = await params;
-  const localeKey = resolveLocale(locale);
+  const localeKey = resolveLocale(locale, FALLBACK_LOCALE);
   const item = await getPublishedPortfolioProjectBySlug(slug);
 
   if (!item) {
@@ -47,14 +48,17 @@ export default async function PortfolioItemPage({
   params,
 }: PortfolioItemPageProps) {
   const { locale, slug } = await params;
-  const localeKey = resolveLocale(locale);
+  const localeKey = resolveLocale(locale, FALLBACK_LOCALE);
   const item = await getPublishedPortfolioProjectBySlug(slug);
 
   if (!item) {
     notFound();
   }
 
-  const t = await getTranslations({ locale: localeKey, namespace: "portfolioDetail" });
+  const [t, siteSettings] = await Promise.all([
+    getTranslations({ locale: localeKey, namespace: "portfolioDetail" }),
+    getSiteSettings(),
+  ]);
 
   return (
     <>
@@ -64,7 +68,12 @@ export default async function PortfolioItemPage({
       />
 
       <Container size="wide" className="pb-12 lg:pb-16">
-        <PortfolioProjectDetail item={item} locale={localeKey} t={t} />
+        <PortfolioProjectDetail
+          item={item}
+          locale={localeKey}
+          defaultLocale={siteSettings.defaultLocale}
+          t={t}
+        />
       </Container>
     </>
   );