migrate custom layers sortable list from sortablejs to svelte-dnd-action

website/package.json

@@ -46,6 +46,7 @@
         "prettier-plugin-svelte": "^3.4.0",
         "svelte": "^5.33.18",
         "svelte-check": "^4.0.0",
+        "svelte-dnd-action": "^0.9.65",
         "svelte-sonner": "^1.0.5",
         "tailwind-variants": "^3.1.1",
         "tailwindcss": "^4.1.8",