Update cypress config to work with vite

Author: Strift

playgrounds/local-react/cypress.json

@@ -1,3 +1,4 @@
 {
-  "watchForFileChanges": true
+  "watchForFileChanges": true,
+  "pluginsFile": false
 }

playgrounds/local-react/package.json

@@ -6,7 +6,7 @@
   "type": "module",
   "scripts": {
     "predev": "node setup.js",
-    "dev": "vite",
+    "dev": "vite --port 9999",
     "build": "vite build",
     "setup": "node setup.js",
     "lint": "eslint --ext .jsx,.js .",