chore(deps): update nuxt framework to v4 (v2) (major) (#4531)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Benjamin Canac <canacb1@gmail.com>

package.json

@@ -45,7 +45,7 @@
     "@headlessui/vue": "^1.7.23",
     "@iconify-json/heroicons": "^1.2.2",
     "@nuxt/icon": "^1.15.0",
-    "@nuxt/kit": "^3.17.7",
+    "@nuxt/kit": "^4.0.0",
     "@nuxtjs/color-mode": "^3.5.2",
     "@nuxtjs/tailwindcss": "^6.14.0",
     "@popperjs/core": "^2.11.8",
@@ -73,7 +73,7 @@
     "@vue/test-utils": "^2.4.6",
     "eslint": "^9.31.0",
     "happy-dom": "^18.0.1",
-    "nuxt": "^3.17.7",
+    "nuxt": "^4.0.0",
     "release-it": "^19.0.3",
     "typescript": "^5.8.3",
     "vitest": "^3.2.4",
@@ -112,6 +112,7 @@
     "@vueuse/integrations": "^13.5.0",
     "@vueuse/math": "^13.5.0",
     "@vueuse/nuxt": "13.1.0",
+    "unimport": "4.1.1",
     "chokidar": "3.6.0"
   }
 }