fix: promise withresolvers polyfill

package.json

@@ -1,6 +1,6 @@
 {
 	"name": "ui",
-	"version": "6.4.62",
+	"version": "6.4.63",
 	"license": "BUSL-1.1",
 	"private": true,
 	"packageManager": "pnpm@9.15.5",

src/routes/+layout.ts

@@ -3,3 +3,15 @@ import '$lib'
 export const ssr = false
 export const prerender = false
 export const trailingSlash = 'always'
+
+if (typeof Promise.withResolvers === 'undefined') {
+  Promise.withResolvers = function <T> () {
+    let resolve: (value: T | PromiseLike<T>) => void
+    let reject: (reason?: unknown) => void
+    const promise = new Promise<T>((_resolve, _reject) => {
+      resolve = _resolve
+      reject = _reject
+    })
+    return { promise, resolve: resolve!, reject: reject! }
+  }
+}