chore(examples): replace Yarn with Bun

Author: metonym

examples/rollup/bun.lockb

@@ -1,6 +1,7 @@
 {
   "extends": "@tsconfig/svelte/tsconfig.json",
   "compilerOptions": {
+    "noEmit": true,
     "target": "esnext",
     "useDefineForClassFields": true,
     "module": "esnext",

examples/rollup/yarn.lock

@@ -1,6 +1,6 @@
 import { sveltekit } from "@sveltejs/kit/vite";
+import type { UserConfig } from "vite";
 
-/** @type {import('vite').UserConfig} */
 export default {
   plugins: [sveltekit()],
-};
+} satisfies UserConfig;