fix(create-mail): add react-dom to scaffold devDeps (#359)

Co-authored-by: CharlieHelps <[email protected]>

Author: charliecreates[bot]

packages/create-mail/generators/package.json.mustache

@@ -12,6 +12,7 @@
     "jsx-email": "^2.0.0"
   },
   "devDependencies": {
-    "react": "^19.1.0"{{{ typeDep }}}
+    "react": "^19.1.0",
+    "react-dom": "^19.1.0"{{{ typeDep }}}
   }
 }