Added lang store

package.json

@@ -12,9 +12,12 @@
   "dependencies": {
     "@astrojs/sitemap": "^3.3.0",
     "@astrojs/vue": "^5.0.7",
+    "@nanostores/persistent": "^0.10.2",
+    "@nanostores/vue": "^0.11.0",
     "@types/leaflet": "^1.9.16",
     "@vueuse/core": "^13.0.0",
     "astro": "^5.5.3",
+    "nanostores": "^0.11.4",
     "radix-vue": "^1.9.17",
     "vue": "^3.5.13"
   },