video thumbnails extractor añadido

lib/providers/videos_provider.dart

@@ -37,6 +37,36 @@ class VideosProvider extends ChangeNotifier {
   String? posterStoragePath;
   String posterFileExtension = '';
   Uint8List? webPosterBytes;
+  // ========== HELPERS ==========
+  /// Sanitize file name to avoid issues with special characters in URLs
+  /// Removes/replaces: brackets [], parentheses (), spaces, special chars
+  String _sanitizeFileName(String fileName) {
+    // Get extension
+    final ext = p.extension(fileName);
+    final nameWithoutExt = p.basenameWithoutExtension(fileName);
+
+    // Replace special characters and spaces
+    String sanitized = nameWithoutExt
+        .replaceAll(RegExp(r'[\[\]\(\){}]'), '') // Remove brackets/parentheses
+        .replaceAll(RegExp(r'[^a-zA-Z0-9_-]'),
+            '_') // Replace other special chars with underscore
+        .replaceAll(
+            RegExp(r'_+'), '_') // Replace multiple underscores with single
+        .replaceAll(
+            RegExp(r'^_|_$'), ''); // Remove leading/trailing underscores
+
+    // If name is empty after sanitization, use generic name
+    if (sanitized.isEmpty) {
+      sanitized = 'video_${DateTime.now().millisecondsSinceEpoch}';
+    }
+
+    // Limit length to avoid excessively long names (max 100 chars + extension)
+    if (sanitized.length > 100) {
+      sanitized = sanitized.substring(0, 100);
+    }
+
+    return '$sanitized$ext';
+  }
 
   // ========== LOADING STATE ==========
   bool isLoading = false;
@@ -246,7 +276,8 @@ class VideosProvider extends ChangeNotifier {
 
       // 1. Upload video to storage
       final timestamp = DateTime.now().millisecondsSinceEpoch;
-      final fileName = '${timestamp}_$videoName';
+      final sanitizedName = _sanitizeFileName(videoName!);
+      final fileName = '${timestamp}_$sanitizedName';
       videoStoragePath = 'videos/$fileName';
 
       await supabaseML.storage.from('energymedia').uploadBinary(
@@ -323,7 +354,8 @@ class VideosProvider extends ChangeNotifier {
 
     try {
       final timestamp = DateTime.now().millisecondsSinceEpoch;
-      final fileName = '${timestamp}_$posterName';
+      final sanitizedName = _sanitizeFileName(posterName!);
+      final fileName = '${timestamp}_$sanitizedName';
       posterStoragePath = 'imagenes/$fileName';
 
       // Solo subir al storage, NO crear registro en media_files
@@ -484,7 +516,8 @@ class VideosProvider extends ChangeNotifier {
 
       // Upload new poster to storage
       final timestamp = DateTime.now().millisecondsSinceEpoch;
-      final fileName = '${timestamp}_$posterName';
+      final sanitizedName = _sanitizeFileName(posterName);
+      final fileName = '${timestamp}_$sanitizedName';
       final posterPath = 'imagenes/$fileName';
 
       await supabaseML.storage.from('energymedia').uploadBinary(