Refactor for i18n, CMS integration, and project slugs; enhance admin & analytics

Co-authored-by: dennis <dennis@konkol.net>

jest.setup.ts

@@ -26,6 +26,34 @@ jest.mock("next/navigation", () => ({
   notFound: jest.fn(),
 }));
 
+// Mock next-intl (ESM) for Jest
+jest.mock("next-intl", () => ({
+  useLocale: () => "en",
+  useTranslations:
+    (namespace?: string) =>
+    (key: string) => {
+      if (namespace === "nav") {
+        const map: Record<string, string> = {
+          home: "Home",
+          about: "About",
+          projects: "Projects",
+          contact: "Contact",
+        };
+        return map[key] || key;
+      }
+      if (namespace === "common") {
+        const map: Record<string, string> = {
+          backToHome: "Back to Home",
+          backToProjects: "Back to Projects",
+        };
+        return map[key] || key;
+      }
+      return key;
+    },
+  NextIntlClientProvider: ({ children }: { children: React.ReactNode }) =>
+    React.createElement(React.Fragment, null, children),
+}));
+
 // Mock next/link
 jest.mock("next/link", () => {
   return function Link({