Fix: prevent double ./cjs/ prefix in main field + fix imports

- Build script was adding ./cjs/ prefix even when main already had it
- Fixed @testing-library/react dependency for tests
- Changed package-style imports to relative imports in rootJs/index.ts
- Bump version to 0.85.5

packages/dev-test/package.json

@@ -216,5 +216,13 @@
   "dependencies": {
     "jsdom": "^24.0.0",
     "tslib": "^2.7.0"
+  },
+  "devDependencies": {
+    "@testing-library/dom": "^10.4.1",
+    "@testing-library/react": "^16.3.1",
+    "@types/react": "^19",
+    "@types/react-dom": "^19",
+    "react": "^19.2.3",
+    "react-dom": "^19.2.3"
   }
 }