fix: Add .next directory to build outputs in turbo.json

- Includes Next.js build output directory (.next)
- Ensures Turbo cache properly recognizes all build outputs
- Fixes missing output file warnings

turbo.json

@@ -3,7 +3,7 @@
   "tasks": {
     "build": {
       "dependsOn": ["^build"],
-      "outputs": ["dist/**", "build/**"]
+      "outputs": ["dist/**", "build/**", ".next/**"]
     },
     "dev": {
       "cache": false,