fix: update nextjs example

Author: mayank1513

examples/nextjs/next-env.d.ts

@@ -1,5 +1,6 @@
 /// <reference types="next" />
 /// <reference types="next/image-types/global" />
+/// <reference types="next/navigation-types/compat/navigation" />
 
 // NOTE: This file should not be edited
 // see https://nextjs.org/docs/basic-features/typescript for more information.

examples/nextjs/tsconfig.json

@@ -1,13 +1,21 @@
 {
-  "exclude": ["node_modules"],
+  "exclude": [
+    "node_modules"
+  ],
   "extends": "@repo/typescript-config/nextjs.json",
   "compilerOptions": {
     "outDir": "dist",
     "plugins": [
       {
         "name": "next"
       }
-    ]
+    ],
+    "strictNullChecks": true
   },
-  "include": ["src", "next.config.js", "next-env.d.ts", ".next/types/**/*.ts"]
+  "include": [
+    "src",
+    "next.config.js",
+    "next-env.d.ts",
+    ".next/types/**/*.ts"
+  ]
 }