Fix Cypress config for ES modules in standalone-ui

- Convert Cypress config from CommonJS to ES modules
- Change require() to import statement
- Change module.exports to export default

This fixes the error "require is not defined in ES module scope"
since standalone-ui package.json has "type": "module".

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: NiloCK

packages/standalone-ui/cypress.config.js

@@ -1,6 +1,6 @@
-const { defineConfig } = require('cypress');
+import { defineConfig } from 'cypress';
 
-module.exports = defineConfig({
+export default defineConfig({
   e2e: {
     baseUrl: 'http://localhost:6173', // package/standalone-ui vite dev server port
     supportFile: 'cypress/support/e2e.js',