fix: align packages/react devDependency specifiers with lockfile

The lockfile was generated with @types/react@^19, @types/react-dom@^19,
and typescript@^5.8.0 -- update package.json to match so --frozen-lockfile passes.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Zhang-JiahangH

packages/react/package.json

@@ -23,10 +23,10 @@
     "react-virtuoso": "^4.14.1"
   },
   "devDependencies": {
-    "@types/react": "^18.3.12",
-    "@types/react-dom": "^18.3.1",
+    "@types/react": "^19.0.0",
+    "@types/react-dom": "^19.0.0",
     "tsup": "^8.4.0",
-    "typescript": "^5.8.2"
+    "typescript": "^5.8.0"
   },
   "scripts": {
     "build": "tsup",