fix: top menu

src/pages/Course/CourseDetails.jsx

@@ -8,7 +8,6 @@ import { Input } from '../../components/ui/input';
 import { Textarea } from '../../components/ui/textarea';
 import { Tabs, TabsList, TabsTrigger, TabsContent } from '../../components/ui/tabs';
 import { Separator } from '../../components/ui/separator';
-import PageHeader from '../../components/PageHeader';
 import {
   HiOutlinePlus,
   HiOutlinePencil,
@@ -140,7 +139,6 @@ function CourseDetail() {
   if (loading) {
     return (
       <>
-        <PageHeader />
         <div className="flex items-center justify-center py-20 text-app-text-muted">Loading course...</div>
       </>
     );
@@ -149,7 +147,6 @@ function CourseDetail() {
   if (error || !course) {
     return (
       <>
-        <PageHeader />
         <div className="flex flex-col items-center justify-center py-20 text-app-text-muted">
           <HiOutlineBookOpen className="w-16 h-16 mb-4 opacity-30" />
           <p className="text-lg font-medium">{error || 'Course not found'}</p>
@@ -170,7 +167,6 @@ function CourseDetail() {
 
   return (
     <>
-      <PageHeader />
 
       {/* Breadcrumb */}
       <div className="flex items-center gap-2 text-sm text-app-text-muted mb-4">