chore(ui): remove placeholder file and add vite-env types

ui/src/vite-env.d.ts

@@ -0,0 +1 @@
+/// <reference types="vite/client" />

ui/tsconfig.json

@@ -9,7 +9,8 @@
     "strict": true,
     "allowJs": true,
     "checkJs": false,
-    "types": ["svelte", "node"]
+    "types": ["svelte", "node"],
+    "skipLibCheck": true
   },
   "include": ["src/**/*.ts", "src/**/*.js", "src/**/*.svelte", "vite.config.ts"]
 }