Add admin site settings sections and locale defaults

tests/app-config.test.ts

@@ -9,6 +9,8 @@ describe("site settings helpers", () => {
   it("builds defaults from the fallback site name", () => {
     const settings = buildDefaultSiteSettings("Studio Moh");
 
+    expect(settings.defaultLocale).toBe("de");
+    expect(settings.brand.primaryColor).toBe("#dc5a35");
     expect(settings.locales.ar.siteName).toBe("Studio Moh");
     expect(settings.locales.ar.titleTemplate).toBe("{pageTitle} | {siteName}");
     expect(settings.locales.en.siteDescription).toBe("Multilingual Next.js base project");
@@ -18,6 +20,10 @@ describe("site settings helpers", () => {
   it("merges stored values with safe defaults", () => {
     const settings = parseSiteSettingsValue(
       JSON.stringify({
+        defaultLocale: "ar",
+        brand: {
+          primaryColor: "#112233",
+        },
         locales: {
           en: {
             siteName: "Brand EN",
@@ -34,6 +40,8 @@ describe("site settings helpers", () => {
       "Fallback Name",
     );
 
+    expect(settings.defaultLocale).toBe("ar");
+    expect(settings.brand.primaryColor).toBe("#112233");
     expect(settings.locales.en.siteName).toBe("Brand EN");
     expect(settings.locales.en.titleTemplate).toBe("{pageTitle} - {siteName}");
     expect(settings.locales.en.siteDescription).toBe("English description");
@@ -66,4 +74,19 @@ describe("site settings helpers", () => {
 
     expect(settings.locales.ar.titleTemplate).toBe("{pageTitle} | {siteName}");
   });
+
+  it("falls back for invalid default locale and invalid primary color", () => {
+    const settings = parseSiteSettingsValue(
+      JSON.stringify({
+        defaultLocale: "fr",
+        brand: {
+          primaryColor: "red",
+        },
+      }),
+      "Fallback Name",
+    );
+
+    expect(settings.defaultLocale).toBe("de");
+    expect(settings.brand.primaryColor).toBe("#dc5a35");
+  });
 });