Update webserver command to use pnpm

Author: TorstenDittmann

playwright.config.ts

@@ -2,7 +2,7 @@ import type { PlaywrightTestConfig } from '@playwright/test';
 
 const config: PlaywrightTestConfig = {
     webServer: {
-        command: 'npm run dev',
+        command: 'pnpm run dev',
         port: 5173
     },
     fullyParallel: true,