Revert "fix(ts): remove conflicting NodeNext module resolution from root tsconfig"

This reverts commit 09758aa.

Author: kolaente

frontend/tsconfig.json

@@ -10,5 +10,8 @@
     {
       "path": "./tsconfig.vitest.json"
     }
-  ]
+  ],
+  "compilerOptions": {
+    "module": "NodeNext"
+  }
 }