Update signup popup message

src/components/AuthenticationFlow/LoginPopup.astro

@@ -7,7 +7,7 @@ import { AuthenticationForm } from './AuthenticationForm';
 <Popup id='login-popup' title='' subtitle=''>
   <div class='mb-7 text-center'>
     <p class='mb-3 text-2xl font-semibold leading-5 text-slate-900'>
-      Login to your account
+      Login or Signup
     </p>
     <p class='mt-2 text-sm leading-4 text-slate-600'>
       You must be logged in to perform this action.

src/components/GenerateCourse/UserCoursesList.tsx

@@ -144,7 +144,7 @@ export function UserCoursesList(props: UserCoursesListProps) {
         </div>
       )}
 
-      {!isUserAiCoursesLoading && !isInitialLoading && courses.length === 0 && (
+      {!isUserAiCoursesLoading && !isInitialLoading && courses.length === 0 && isAuthenticated && (
         <div className="flex min-h-[152px] items-center justify-center rounded-lg border border-gray-200 bg-white py-4">
           <p className="text-sm text-gray-600">
             You haven't generated any courses yet.