refactor: switch to solid icons and clean up CSS

- Change from outline icons (heroicon-o-*) to solid icons (heroicon-s-*)
- Remove unnecessary margin-right from CSS since flexbox gap handles spacing
- Keep CSS file for future use
- Solid folder and document icons with proper spacing

Author: scott grayson

resources/css/filament-library.css

@@ -11,8 +11,3 @@
 .library-item-name-column .fi-icon {
     color: rgb(75 85 99) !important; /* gray-600 - darker than default gray */
 }
-
-/* Ensure proper spacing between icon and text */
-.library-item-name-column .fi-icon {
-    margin-right: 0.5rem; /* 8px additional spacing */
-}

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-o-folder' : 'heroicon-o-document'
+                        $record->type === 'folder' ? 'heroicon-s-folder' : 'heroicon-s-document'
                     )
                     ->iconColor('gray')
                     ->iconPosition('before')