add knip dependency to login app (#6135)

Author: jnsdls

apps/login/knip.json

@@ -0,0 +1,8 @@
+{
+  "$schema": "https://unpkg.com/knip@5/schema.json",
+  "next": true,
+  "ignore": ["public/**"],
+  "project": ["src/**"],
+  "ignoreBinaries": ["only-allow", "biome"],
+  "ignoreDependencies": ["thirdweb", "eslint-config-next"]
+}

apps/login/package.json

@@ -26,7 +26,9 @@
     "@types/react-dom": "19.0.3",
     "eslint": "^9",
     "eslint-config-next": "15.1.6",
+    "knip": "5.43.6",
     "postcss": "8.5.1",
+    "postcss-load-config": "^6.0.1",
     "tailwindcss": "3.4.17",
     "typescript": "5.7.3"
   }