feat: add resilient cover previews and zoom

components/CourseCard.tsx

@@ -44,6 +44,7 @@ export const CourseCard: React.FC<CourseCardProps> = ({
           draggable={false}
           onDragStart={(e) => e.preventDefault()}
           className="h-full w-full object-cover transition-opacity duration-300 opacity-90 group-hover:opacity-100 rounded-[8px] select-none pointer-events-none"
+          style={{ transform: `scale(${course.coverImageZoom || 1})` }}
         />
 
         {/* Badges on Thumbnail */}

components/Hero.tsx

@@ -24,6 +24,7 @@ export const Hero: React.FC<HeroProps> = ({ onPlay }) => {
           src={featuredCourse.thumbnail}
           alt={featuredCourse.title}
           className="w-full h-full object-cover object-center"
+          style={{ transform: `scale(${featuredCourse.coverImageZoom || 1})` }}
         />
         {/* Gradients for text readability and seamless transition */}
         <div className="absolute inset-0 bg-gradient-to-t from-black via-black/60 to-black/75" />

components/SearchModal.tsx

@@ -136,6 +136,7 @@ export const SearchModal: React.FC<SearchModalProps> = ({ isOpen, onClose, onPla
                               src={course.thumbnail} 
                               alt={course.title} 
                               className="w-full h-full object-cover opacity-80 group-hover:opacity-100 group-hover:scale-105 transition-all duration-300 rounded-[8px]" 
+                              style={{ transform: `scale(${course.coverImageZoom || 1})` }}
                             />
                             <div className="absolute inset-0 flex items-center justify-center opacity-0 group-hover:opacity-100 transition-opacity bg-black/40">
                               <PlayCircle className="w-10 h-10 text-orange-500" />

pages/ManageCourses.tsx

@@ -10,6 +10,8 @@ import {
   MessageSquare, 
   Send, 
   Image as ImageIcon, 
+  Minus,
+  PlusCircle,
   Video, 
   Loader2, 
   FileText, 
@@ -48,7 +50,11 @@ const CourseModal: React.FC<{
   const [category, setCategory] = useState('');
   const [status, setStatus] = useState<Course['status']>('draft');
   const [thumbnailPreview, setThumbnailPreview] = useState<string>('');
+  const [coverImageUrl, setCoverImageUrl] = useState<string>('');
+  const [coverImageZoom, setCoverImageZoom] = useState(1);
+  const [coverPreviewError, setCoverPreviewError] = useState(false);
   const coverFileRef = useRef<HTMLInputElement>(null);
+  const localCoverPreviewRef = useRef<string | null>(null);
   const [categories, setCategories] = useState<string[]>([]);
   const [coverConfigured, setCoverConfigured] = useState<boolean | null>(null);
   const [coverUploadMessage, setCoverUploadMessage] = useState('');
@@ -90,6 +96,8 @@ const CourseModal: React.FC<{
         setCategory(initialData.category);
         setStatus(initialData.status || 'published');
         setThumbnailPreview(initialData.thumbnail);
+        setCoverImageUrl(initialData.thumbnail);
+        setCoverImageZoom(initialData.coverImageZoom || 1);
         setTips(initialData.tips || []);
         setAttachments(initialData.attachments || []);
         setLessons(initialData.lessons || []);
@@ -99,10 +107,17 @@ const CourseModal: React.FC<{
         setCategory('');
         setStatus('draft');
         setThumbnailPreview('');
+        setCoverImageUrl('');
+        setCoverImageZoom(1);
         setTips([]);
         setAttachments([]);
         setLessons([]);
       }
+      if (localCoverPreviewRef.current) {
+        URL.revokeObjectURL(localCoverPreviewRef.current);
+        localCoverPreviewRef.current = null;
+      }
+      setCoverPreviewError(false);
       setNewLessonMedia(null);
       setBunnyUploadState('idle');
       setBunnyUploadMessage('');
@@ -122,6 +137,10 @@ const CourseModal: React.FC<{
     }
   }, [isOpen, initialData]);
 
+  useEffect(() => () => {
+    if (localCoverPreviewRef.current) URL.revokeObjectURL(localCoverPreviewRef.current);
+  }, []);
+
   const toBunnyMedia = (video: BunnyVideo): LessonMedia => ({
     provider: 'bunny',
     externalId: video.id,
@@ -175,7 +194,12 @@ const CourseModal: React.FC<{
     setCoverUploadMessage(`Enviando ${file.name}...`);
     try {
       const response = await instructorApi.uploadCover(file);
-      setThumbnailPreview(response.data.coverImageUrl);
+      if (localCoverPreviewRef.current) URL.revokeObjectURL(localCoverPreviewRef.current);
+      const localPreviewUrl = URL.createObjectURL(file);
+      localCoverPreviewRef.current = localPreviewUrl;
+      setThumbnailPreview(localPreviewUrl);
+      setCoverImageUrl(response.data.coverImageUrl);
+      setCoverPreviewError(false);
       setCoverUploadMessage('Imagem de capa enviada com sucesso.');
     } catch (error) {
       setCoverUploadMessage(error instanceof Error ? error.message : 'Não foi possível enviar a imagem de capa.');
@@ -351,7 +375,8 @@ const CourseModal: React.FC<{
         description,
         category: category || categories[0],
         status,
-        thumbnail: thumbnailPreview || '/course-placeholder.svg',
+        thumbnail: coverImageUrl || '/course-placeholder.svg',
+        coverImageZoom,
         duration: durationStr,
         instructor: initialData?.instructor || '',
         views: initialData?.views || 0,
@@ -411,9 +436,40 @@ const CourseModal: React.FC<{
             >
               {thumbnailPreview ? (
                 <>
-                  <img src={thumbnailPreview} alt="Preview" className="w-full h-full object-cover opacity-70 group-hover:opacity-40 transition-opacity" />
-                  <div className="absolute inset-0 flex items-center justify-center opacity-0 group-hover:opacity-100 transition-opacity">
-                    <span className="bg-orange-500 px-4 py-2 rounded-xl text-xs font-bold shadow-lg">Alterar Capa</span>
+                  {coverPreviewError ? (
+                    <div className="p-6 text-center">
+                      <ImageIcon className="mx-auto mb-2 h-9 w-9 text-amber-400" />
+                      <p className="text-sm font-semibold text-white">Não foi possível carregar a imagem</p>
+                      <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}
+                      alt="Prévia da imagem de capa"
+                      onError={() => setCoverPreviewError(true)}
+                      className="h-full w-full object-cover opacity-80 transition-transform duration-200"
+                      style={{ transform: `scale(${coverImageZoom})` }}
+                    />
+                  )}
+                  <div className="absolute inset-x-3 bottom-3 flex items-center justify-between gap-3">
+                    <span className="rounded-lg bg-black/70 px-3 py-2 text-xs font-semibold text-white backdrop-blur-sm">Clique na imagem para alterar</span>
+                    <div className="flex items-center rounded-lg border border-white/10 bg-black/70 p-1 backdrop-blur-sm">
+                      <button
+                        type="button"
+                        aria-label="Reduzir zoom da imagem"
+                        disabled={coverImageZoom <= 1}
+                        onClick={(event) => { event.stopPropagation(); setCoverImageZoom((current) => Math.max(1, Number((current - 0.1).toFixed(1)))); }}
+                        className="rounded-md p-1.5 text-white transition-colors hover:bg-white/10 disabled:cursor-not-allowed disabled:opacity-30"
+                      ><Minus className="h-4 w-4" /></button>
+                      <span className="min-w-12 text-center text-[11px] font-bold text-white">{Math.round(coverImageZoom * 100)}%</span>
+                      <button
+                        type="button"
+                        aria-label="Aumentar zoom da imagem"
+                        disabled={coverImageZoom >= 2.5}
+                        onClick={(event) => { event.stopPropagation(); setCoverImageZoom((current) => Math.min(2.5, Number((current + 0.1).toFixed(1)))); }}
+                        className="rounded-md p-1.5 text-white transition-colors hover:bg-white/10 disabled:cursor-not-allowed disabled:opacity-30"
+                      ><PlusCircle className="h-4 w-4" /></button>
+                    </div>
                   </div>
                 </>
               ) : (
@@ -929,6 +985,7 @@ export const ManageCourses: React.FC = () => {
                       src={course.thumbnail} 
                       alt={course.title} 
                       className="w-full h-full object-cover group-hover:scale-105 transition-transform duration-500" 
+                      style={{ transform: `scale(${course.coverImageZoom || 1})` }}
                     />
                     <div className="absolute top-3 left-3 bg-black/70 backdrop-blur-md px-2.5 py-1 rounded-[980px] text-caption font-semibold uppercase tracking-caption text-white border border-white/10">
                       {course.category}

pages/MyLearning.tsx

@@ -28,7 +28,7 @@ export const MyLearning: React.FC<{ onPlay: (course: Course) => void }> = ({ onP
         <div className="grid grid-cols-1 md:grid-cols-2 xl:grid-cols-3 gap-5">
           {courses.map((course) => (
             <button key={course.id} onClick={() => onPlay(course)} className="group overflow-hidden rounded-2xl border border-white/10 bg-zinc-950/80 text-left hover:border-orange-500/50 transition-colors">
-              <div className="aspect-video relative bg-zinc-900"><img src={course.thumbnail} alt="" className="h-full w-full object-cover opacity-75 group-hover:opacity-100 transition-opacity" /><div className="absolute inset-0 bg-gradient-to-t from-black/80 to-transparent" /><span className="absolute left-4 bottom-4 inline-flex items-center gap-2 rounded-full bg-orange-500 px-3 py-2 text-xs font-bold text-white"><PlayCircle className="w-4 h-4" /> Continuar</span></div>
+              <div className="aspect-video relative overflow-hidden bg-zinc-900"><img src={course.thumbnail} alt="" className="h-full w-full object-cover opacity-75 transition-opacity group-hover:opacity-100" style={{ transform: `scale(${course.coverImageZoom || 1})` }} /><div className="absolute inset-0 bg-gradient-to-t from-black/80 to-transparent" /><span className="absolute left-4 bottom-4 inline-flex items-center gap-2 rounded-full bg-orange-500 px-3 py-2 text-xs font-bold text-white"><PlayCircle className="w-4 h-4" /> Continuar</span></div>
               <div className="p-5"><p className="text-xs text-orange-400 font-semibold uppercase tracking-wider">{course.category}</p><h2 className="mt-2 font-bold text-white">{course.title}</h2><div className="mt-4 h-1.5 overflow-hidden rounded-full bg-white/10"><div className="h-full rounded-full bg-orange-500" style={{ width: `${course.progress || 0}%` }} /></div><p className="mt-2 text-xs text-gray-400">{course.progress || 0}% concluído</p></div>
             </button>
           ))}

server/migrations/007_course_cover_zoom.sql

@@ -0,0 +1,3 @@
+alter table courses
+  add column cover_image_zoom real not null default 1
+  check (cover_image_zoom >= 1 and cover_image_zoom <= 2.5);

server/src/routes/courses.ts

@@ -21,6 +21,7 @@ export const courseSelect = (publicOnly = false, includeUnreadyMedia = false) =>
     coalesce(c.cover_image_url, (
       select value #>> '{}' from platform_settings where key = 'media.defaultCoverImageUrl'
     )) as "coverImageUrl",
+    c.cover_image_zoom as "coverImageZoom",
     c.status,
     c.published_at as "publishedAt",
     jsonb_build_object(

server/src/routes/manage-courses.ts

@@ -45,6 +45,7 @@ const courseSchema = z.object({
   description: z.string().max(10000).default(''),
   category: z.string().trim().min(1).max(120),
   coverImageUrl: coverImageUrlSchema.nullable().optional(),
+  coverImageZoom: z.number().min(1).max(2.5).default(1),
   status: z.enum(['draft', 'published']).default('draft'),
   lessons: z.array(lessonSchema).min(1),
   assets: z.array(assetSchema).default([]),
@@ -213,10 +214,10 @@ export const manageCourseRoutes: FastifyPluginAsync = async (app) => {
       await client.query('begin');
       const slug = await uniqueSlug(client, input.slug, input.title);
       const course = await client.query<{ id: string }>(
-        `insert into courses (slug, title, description, category, cover_image_url, status, instructor_id, published_at)
-         values ($1, $2, $3, $4, $5, $6::course_status, $7, case when $6::course_status = 'published'::course_status then now() else null end)
+        `insert into courses (slug, title, description, category, cover_image_url, cover_image_zoom, status, instructor_id, published_at)
+         values ($1, $2, $3, $4, $5, $6, $7::course_status, $8, case when $7::course_status = 'published'::course_status then now() else null end)
          returning id`,
-        [slug, input.title, input.description, input.category, input.coverImageUrl ?? null, input.status, request.user.id],
+        [slug, input.title, input.description, input.category, input.coverImageUrl ?? null, input.coverImageZoom, input.status, request.user.id],
       );
       await replaceCourseContents(client, course.rows[0].id, input);
       await client.query('commit');
@@ -245,10 +246,10 @@ export const manageCourseRoutes: FastifyPluginAsync = async (app) => {
       const slug = await uniqueSlug(client, input.slug, input.title, courseId);
       await client.query(
         `update courses
-         set slug = $2, title = $3, description = $4, category = $5, cover_image_url = $6,
-             status = $7::course_status, published_at = case when $7::course_status = 'published'::course_status then coalesce(published_at, now()) else null end
+         set slug = $2, title = $3, description = $4, category = $5, cover_image_url = $6, cover_image_zoom = $7,
+             status = $8::course_status, published_at = case when $8::course_status = 'published'::course_status then coalesce(published_at, now()) else null end
          where id = $1`,
-        [courseId, slug, input.title, input.description, input.category, input.coverImageUrl ?? null, input.status],
+        [courseId, slug, input.title, input.description, input.category, input.coverImageUrl ?? null, input.coverImageZoom, input.status],
       );
       await replaceCourseContents(client, courseId, input);
       await client.query('commit');
@@ -280,8 +281,8 @@ export const manageCourseRoutes: FastifyPluginAsync = async (app) => {
     const client = await pool.connect();
     try {
       await client.query('begin');
-      const original = await client.query<{ title: string; description: string; category: string; cover_image_url: string | null; instructor_id: string }>(
-        `select title, description, category, cover_image_url, instructor_id from courses where id = $1`, [courseId],
+      const original = await client.query<{ title: string; description: string; category: string; cover_image_url: string | null; cover_image_zoom: number; instructor_id: string }>(
+        `select title, description, category, cover_image_url, cover_image_zoom, instructor_id from courses where id = $1`, [courseId],
       );
       if (!original.rows[0]) {
         await client.query('rollback');
@@ -291,9 +292,9 @@ export const manageCourseRoutes: FastifyPluginAsync = async (app) => {
       const title = `${source.title} (cópia)`;
       const slug = await uniqueSlug(client, undefined, title);
       const copiedCourse = await client.query<{ id: string }>(
-        `insert into courses (slug, title, description, category, cover_image_url, status, instructor_id)
-         values ($1, $2, $3, $4, $5, 'draft', $6) returning id`,
-        [slug, title, source.description, source.category, source.cover_image_url, source.instructor_id],
+        `insert into courses (slug, title, description, category, cover_image_url, cover_image_zoom, status, instructor_id)
+         values ($1, $2, $3, $4, $5, $6, 'draft', $7) returning id`,
+        [slug, title, source.description, source.category, source.cover_image_url, source.cover_image_zoom, source.instructor_id],
       );
       const newCourseId = copiedCourse.rows[0].id;
       await client.query(

services/db.ts

@@ -17,6 +17,7 @@ type ApiCourse = {
   description: string;
   category: string;
   coverImageUrl: string | null;
+  coverImageZoom: number;
   status: 'draft' | 'published' | 'archived';
   progress?: number;
   lastActivity?: string | null;
@@ -67,6 +68,7 @@ const toCourse = (course: ApiCourse): Course => ({
   description: course.description,
   category: course.category,
   thumbnail: course.coverImageUrl || '/course-placeholder.svg',
+  coverImageZoom: course.coverImageZoom || 1,
   instructor: course.instructor.name,
   status: course.status === 'draft' ? 'draft' : 'published',
   progress: course.progress,
@@ -124,6 +126,7 @@ const toCoursePayload = (course: Course) => ({
   description: course.description,
   category: course.category,
   coverImageUrl: course.thumbnail && /^https?:\/\//.test(course.thumbnail) ? course.thumbnail : null,
+  coverImageZoom: course.coverImageZoom || 1,
   status: course.status || 'published',
   assets: (course.attachments || []).filter((attachment) => attachment.url && attachment.url !== '#').map(toAssetPayload),
   lessons: course.lessons.map((lesson) => ({

types.ts

@@ -42,6 +42,7 @@ export interface Course {
   title: string;
   category: string;
   thumbnail: string;
+  coverImageZoom?: number;
   lessons: Lesson[]; 
   progress?: number; // 0 to 100
   views?: number;