Add all files

app/Admin/Resources/CategoryResource/Pages/CreateCategory.php

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+<?php
+
+namespace App\Admin\Resources\CategoryResource\Pages;
+
+use App\Admin\Resources\CategoryResource;
+use Filament\Resources\Pages\CreateRecord;
+
+class CreateCategory extends CreateRecord
+{
+    protected static string $resource = CategoryResource::class;
+}

app/Admin/Resources/CategoryResource/Pages/EditCategory.php

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+<?php
+
+namespace App\Admin\Resources\CategoryResource\Pages;
+
+use App\Admin\Resources\CategoryResource;
+use Filament\Actions;
+use Filament\Notifications\Notification;
+use Filament\Resources\Pages\EditRecord;
+
+class EditCategory extends EditRecord
+{
+    protected static string $resource = CategoryResource::class;
+
+    protected function getHeaderActions(): array
+    {
+        return [
+            Actions\DeleteAction::make()->before(function (Actions\DeleteAction $action) {
+                if ($this->record->products()->exists() || $this->record->children()->exists()) {
+                    Notification::make()
+                        ->title('Cannot delete category')
+                        ->body('The category has products or children categories.')
+                        ->duration(5000)
+                        ->icon('ri-error-warning-line')
+                        ->danger()
+                        ->send();
+                    $action->cancel();
+                }
+            }),
+        ];
+    }
+}

app/Admin/Resources/CategoryResource/Pages/ListCategories.php

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+<?php
+
+namespace App\Admin\Resources\CategoryResource\Pages;
+
+use App\Admin\Resources\CategoryResource;
+use Filament\Actions;
+use Filament\Resources\Pages\ListRecords;
+
+class ListCategories extends ListRecords
+{
+    protected static string $resource = CategoryResource::class;
+
+    protected function getHeaderActions(): array
+    {
+        return [
+            Actions\CreateAction::make(),
+        ];
+    }
+}