Cleaned frontend config to use yarn

frontend/.yarnrc.yml

@@ -0,0 +1 @@
+nodeLinker: node-modules

frontend/package.json

@@ -7,6 +7,8 @@
     "eslint-plugin-solid": "^0.14.5",
     "globals": "^17.3.0",
     "jiti": "^2.6.1",
+    "typescript": "^5.5.4",
     "typescript-eslint": "^8.54.0"
-  }
+  },
+  "packageManager": "yarn@4.0.0"
 }