feat: update seeder with real YouTube video URLs and update technical blueprint

app/Filament/Admin/Resources/Courses/Schemas/CourseForm.php

@@ -21,7 +21,7 @@ class CourseForm
                     ->required(),
                 TextInput::make('slug')
                     ->required(),
-                Textarea::make('description')
+                \Filament\Forms\Components\RichEditor::make('description')
                     ->columnSpanFull(),
                 Select::make('level_id')
                     ->relationship('level', 'name'),
@@ -29,9 +29,13 @@ class CourseForm
                     ->required()
                     ->numeric()
                     ->default(0)
-                    ->prefix('$'),
-                TextInput::make('thumbnail_url')
-                    ->url(),
+                    ->prefix('IDR'),
+                \Filament\Forms\Components\FileUpload::make('thumbnail_url')
+                    ->disk('r2')
+                    ->directory('thumbnails')
+                    ->visibility('public')
+                    ->image()
+                    ->imageEditor(),
                 Toggle::make('is_published')
                     ->required(),
                 Textarea::make('metadata')