[chore] Revert useDefineForClassFields to fix test failures

- Remove useDefineForClassFields from tsconfig to maintain backward compatibility
- Keep explicit field declarations removed to fix i18n Playwright tests
- This balances both test suite requirements

tsconfig.json

@@ -4,7 +4,6 @@
     "module": "ESNext",
     "lib": ["ES2022", "DOM", "DOM.Iterable"],
     "skipLibCheck": true,
-    "useDefineForClassFields": true,
     "incremental": true,
     "sourceMap": true,
     "esModuleInterop": true,