feat: update playground paths

playground/svelte.config.js

@@ -12,6 +12,10 @@ const config = {
     // If your environment is not supported, or you settled on a specific environment, switch out the adapter.
     // See https://svelte.dev/docs/kit/adapters for more information about adapters.
     adapter: adapter(),
+
+    paths: {
+      base: "/_playground",
+    },
   },
 };