Add Better Auth admin authentication

app/dashboard/layout.tsx

@@ -1,7 +1,7 @@
 import { redirect } from "next/navigation";
 
+import { isAuthenticated } from "@/lib/auth-server";
 import { DashboardSidebar } from "@/components/dashboard-sidebar";
-import { getCurrentMockSession } from "@/lib/mock-session";
 import { getDashboardRedirectPath } from "@/lib/route-guards";
 
 export default async function DashboardLayout({
@@ -9,16 +9,16 @@ export default async function DashboardLayout({
 }: {
   children: React.ReactNode;
 }) {
-  const session = await getCurrentMockSession();
-  const redirectPath = getDashboardRedirectPath(session);
+  const hasSession = await isAuthenticated();
+  const redirectPath = getDashboardRedirectPath(hasSession);
 
-  if (redirectPath || !session) {
+  if (redirectPath) {
     redirect(redirectPath ?? "/");
   }
 
   return (
     <div className="min-h-dvh bg-background md:flex">
-      <DashboardSidebar session={session} />
+      <DashboardSidebar />
       <div className="min-w-0 flex-1">{children}</div>
     </div>
   );