feat: improve visual distinction with mixed icon styles

- Use solid folder icons (heroicon-s-folder) for better visibility
- Use outline document icons (heroicon-o-document) for contrast
- Creates clearer visual distinction between folders and files
- Solid folders stand out more, outline files are lighter

Author: scott grayson

src/Resources/LibraryItemResource.php

@@ -93,7 +93,7 @@ public static function table(Table $table): Table
                     ->searchable()
                     ->sortable()
                     ->icon(fn (LibraryItem $record): string => 
-                        $record->type === 'folder' ? 'heroicon-s-folder' : 'heroicon-s-document'
+                        $record->type === 'folder' ? 'heroicon-s-folder' : 'heroicon-o-document'
                     )
                     ->iconColor('gray')
                     ->iconPosition('before')