Update dependency next to v15 [SECURITY]

Author: renovate[bot]

package.json

@@ -42,7 +42,7 @@
     "e2b": "^2.8.4",
     "lucide-react": "^0.396.0",
     "nanoid": "^5.1.6",
-    "next": "^14.2.35",
+    "next": "^15.0.0",
     "next-themes": "^0.3.0",
     "ollama-ai-provider": "^1.2.0",
     "posthog-js": "^1.158.3",