fix: Add babel configuration for Playwright to handle TypeScript declare fields

- Configure babel plugins for TypeScript with allowDeclareFields option
- Add module resolver for @ alias to src directory
- Create custom babel plugin to stub Vue/CSS imports
- Add browser globals polyfill using happy-dom for Node.js context
- Update playwright.i18n.config.ts with babel configuration

This enables collect-i18n tests to run with proper TypeScript and module transformations.

scripts/collect-i18n-node-defs.ts

@@ -1,3 +1,4 @@
+import './setup-browser-globals.js'
 import * as fs from 'fs'
 
 import { comfyPageFixture as test } from '../browser_tests/fixtures/ComfyPage'