Update Next.js to version 15.4.2 and refactor invoice pages

- Upgrade Next.js and related packages for improved performance and security
- Refactor invoice-related pages to streamline navigation and enhance user experience
- Consolidate invoice editing and viewing functionality into a single page
- Remove deprecated edit page and implement a new view page for invoices
- Update links and routing for consistency across the dashboard

package.json

@@ -63,7 +63,7 @@
     "file-saver": "^2.0.5",
     "lucide": "^0.525.0",
     "lucide-react": "^0.525.0",
-    "next": "^15.4.1",
+    "next": "^15.4.2",
     "next-auth": "5.0.0-beta.25",
     "react": "^19.0.0",
     "react-day-picker": "^9.8.0",