fix: fall back to Bunny Storage for cover images

pages/ManageCourses.tsx

@@ -38,6 +38,7 @@ import { Course, Comment, Attachment, Lesson, AttachmentType, LessonMedia } from
 import { useToast } from '../context/ToastContext';
 import { getManagedCourses, saveCourse, deleteCourse, duplicateCourse, getComments, replyToComment, moderateComment } from '../services/db';
 import { getAttachmentIcon, getAttachmentBadge } from '../components/MaterialCard';
+import { CourseCoverImage } from '../components/CourseCoverImage';
 import { BunnyVideo, courseApi, instructorApi, InstructorAnalytics } from '../services/api';
 
 const formatVideoDuration = (seconds: number | null | undefined) => {
@@ -514,10 +515,10 @@ const CourseModal: React.FC<{
                       <p className="mt-1 text-xs text-gray-400">Tente enviá-la novamente. Se o problema continuar, verifique a configuração de entrega de imagens.</p>
                     </div>
                   ) : (
-                    <img
-                      src={thumbnailPreview}
+                    <CourseCoverImage
+                      source={thumbnailPreview}
                       alt="Prévia da imagem de capa"
-                      onError={() => setCoverPreviewError(true)}
+                      onFinalError={() => setCoverPreviewError(true)}
                       className="h-full w-full object-cover opacity-80 transition-transform duration-200"
                       style={{
                         transform: `scale(${coverImageZoom})`,
@@ -1078,8 +1079,8 @@ export const ManageCourses: React.FC = () => {
                 <div>
                   {/* Thumbnail */}
                   <div className="aspect-video relative overflow-hidden bg-black rounded-t-[8px]">
-                    <img 
-                      src={course.thumbnail} 
+                    <CourseCoverImage
+                      source={course.thumbnail}
                       alt={course.title} 
                       className="w-full h-full object-cover group-hover:scale-105 transition-transform duration-500" 
                       style={{