move to sveltekit 2, fix 404 page returning 500

package.json

@@ -15,7 +15,7 @@
     "generate_iconfont_subset": "cd scripts && bash ./generate_iconfont_subset.sh"
   },
   "dependencies": {
-    "@sveltejs/kit": "^1.30.4",
+    "@sveltejs/kit": "^2.0.0",
     "@types/node": "^20.17.16",
     "@typescript-eslint/eslint-plugin": "^5.62.0",
     "@typescript-eslint/parser": "^5.62.0",
@@ -34,10 +34,11 @@
     "svelte-select": "^5.8.3",
     "tslib": "^2.8.1",
     "typescript": "^5.7.3",
-    "vite": "^4.5.9"
+    "vite": "^5.0.0"
   },
   "type": "module",
   "devDependencies": {
+    "@sveltejs/vite-plugin-svelte": "^3.0.0",
     "svelte-adapter-bun": "https://github.com/gornostay25/svelte-adapter-bun"
   },
   "trustedDependencies": [