fix(deps): update nextjs monorepo to v15

Author: renovate[bot]

packages/wallet/frontend/package.json

@@ -15,7 +15,7 @@
     "@wallet/shared": "workspace:*",
     "class-variance-authority": "^0.7.1",
     "ky": "^1.8.2",
-    "next": "14.2.32",
+    "next": "15.5.4",
     "next-themes": "^0.4.6",
     "node-rsa": "^1.1.1",
     "nprogress": "^0.2.0",
@@ -32,8 +32,8 @@
     "zod": "^3.25.76"
   },
   "devDependencies": {
-    "@next/bundle-analyzer": "^13.4.12",
-    "@next/eslint-plugin-next": "^13.4.12",
+    "@next/bundle-analyzer": "^15.5.4",
+    "@next/eslint-plugin-next": "^15.5.4",
     "@tailwindcss/forms": "^0.5.10",
     "@types/node": "^20.17.30",
     "@types/nprogress": "^0.2.3",