chore: opt-in into new nuxt v4 TS Project References

Author: NamesMT

apps/frontend/tsconfig.json

@@ -1,12 +1,10 @@
 {
   // https://nuxt.com/docs/guide/concepts/typescript
-  "extends": "./.nuxt/tsconfig.json",
   "references": [
-    {
-      "path": "../backend"
-    },
-    {
-      "path": "../backend-convex"
-    }
-  ]
+    { "path": "./.nuxt/tsconfig.app.json" },
+    { "path": "./.nuxt/tsconfig.server.json" },
+    { "path": "./.nuxt/tsconfig.node.json" },
+    { "path": "../backend" }
+  ],
+  "files": []
 }