chore: Add --error-on-warnings flag

Author: koki-develop

package.json

@@ -21,7 +21,7 @@
   "type": "module",
   "scripts": {
     "prepare": "husky",
-    "lint": "biome check .",
+    "lint": "biome check --error-on-warnings .",
     "fmt": "biome check --write --unsafe .",
     "gha:install": "ghats install",
     "gha:build": "ghats build",