chore: bump version to 2.18.1 and update AppBreadcrumbs component (#386)

- Incremented application version from 2.18.0 to 2.18.1 in package.json.
- Refactored AppBreadcrumbs component to use Next.js Link for improved navigation.

packages/billing/lemon-squeezy/package.json

@@ -25,7 +25,7 @@
     "@kit/tsconfig": "workspace:*",
     "@kit/ui": "workspace:*",
     "@types/react": "19.1.16",
-    "next": "15.5.4",
+    "next": "15.5.5",
     "react": "19.1.1",
     "zod": "^3.25.74"
   },