feat: add Bunny Storage course cover uploads

services/api.ts

@@ -84,6 +84,16 @@ async function uploadRequest<T>(path: string, file: File): Promise<T> {
   return body as T;
 }
 
+async function uploadImageRequest<T>(path: string, file: File): Promise<T> {
+  const session = getSession();
+  const headers = new Headers({ 'Content-Type': file.type || 'application/octet-stream' });
+  if (session) headers.set('Authorization', `Bearer ${session.token}`);
+  const response = await fetch(`${API_URL}${path}`, { method: 'POST', headers, body: file });
+  const body = await response.json().catch(() => ({}));
+  if (!response.ok) throw new ApiError(body.error || 'The cover image could not be uploaded', response.status);
+  return body as T;
+}
+
 export const authApi = {
   async login(email: string, password: string) {
     return apiRequest<Session>('/auth/login', { method: 'POST', body: JSON.stringify({ email, password }) });
@@ -140,6 +150,8 @@ export const instructorApi = {
   async bunnyVideoStatus(videoId: string) {
     return apiRequest<{ data: BunnyVideo }>(`/manage/media/bunny/videos/${videoId}`);
   },
+  async coverConfiguration() { return apiRequest<{ data: { configured: boolean; maxUploadBytes: number } }>('/manage/media/covers/config'); },
+  async uploadCover(file: File) { return uploadImageRequest<{ data: { key: string; coverImageUrl: string } }>('/manage/media/covers', file); },
 };
 
 export const courseApi = {

services/db.ts

@@ -123,7 +123,7 @@ const toCoursePayload = (course: Course) => ({
   title: course.title,
   description: course.description,
   category: course.category,
-  coverImageUrl: course.thumbnail && !course.thumbnail.startsWith('blob:') ? course.thumbnail : null,
+  coverImageUrl: course.thumbnail && /^https?:\/\//.test(course.thumbnail) ? course.thumbnail : null,
   status: course.status || 'published',
   assets: (course.attachments || []).filter((attachment) => attachment.url && attachment.url !== '#').map(toAssetPayload),
   lessons: course.lessons.map((lesson) => ({