chore: remove unused esbuild-polyfill and suppress Rolldown inject warning

Remove @esbuild-plugins/node-globals-polyfill (redundant since Vite 8
rolldownOptions.define handles globalThis). Add rolldownOptions.checks
to suppress PREFER_BUILTIN_FEATURE until Vite exposes output in rolldownOptions.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

vite.config.js

@@ -2,9 +2,9 @@ import { defineConfig } from 'vite';
 import react from '@vitejs/plugin-react';
 import { sentryVitePlugin } from '@sentry/vite-plugin';
 import { wasm } from '@rollup/plugin-wasm';
+import inject from '@rollup/plugin-inject';
 import { viteStaticCopy } from 'vite-plugin-static-copy';
 import { vanillaExtractPlugin } from '@vanilla-extract/vite-plugin';
-import inject from '@rollup/plugin-inject';
 import { VitePWA } from 'vite-plugin-pwa';
 import fs from 'fs';
 import path from 'path';
@@ -137,6 +137,7 @@ export default defineConfig({
     outDir: 'dist',
     sourcemap: process.env.SENTRY_AUTH_TOKEN ? 'hidden' : false,
     copyPublicDir: false,
+    rolldownOptions: { checks: { preferBuiltinFeature: false } },
     rollupOptions: {
       plugins: [inject({ Buffer: ['buffer', 'Buffer'] })],
       output: {