implemented file thumbnails and enhanced file type icons, added reusable FileLeading widget, and updated search to support previews

lib/view/pages/share_intent/share_folder_picker.dart

@@ -19,6 +19,7 @@ import '../../../widget/placeholder_view.dart';
 import '../files/data/sort_options.dart';
 import '../files/files_upload_dialog.dart';
 import '../files/widgets/add_file_menu.dart';
+import '../files/widgets/file_leading.dart';
 import '../files/widgets/files_sort_actions.dart';
 
 typedef _FolderConfirmedCallback =
@@ -181,7 +182,7 @@ class _ShareFolderPickerViewState extends State<_ShareFolderPickerView> {
             final entry = entries[i];
             if (entry.isDirectory) {
               return ListTile(
-                leading: const Icon(Icons.folder_outlined),
+                leading: FileLeading(file: entry),
                 title: Text(entry.name),
                 trailing: const Icon(Icons.chevron_right),
                 onTap: () => _enter(bloc, state.currentPath, entry.name),
@@ -189,7 +190,7 @@ class _ShareFolderPickerViewState extends State<_ShareFolderPickerView> {
             }
             return ListTile(
               enabled: false,
-              leading: const Icon(Icons.description_outlined),
+              leading: FileLeading(file: entry),
               title: Text(entry.name),
             );
           },