perf(head): disable @vueuse/head polyfill by default (#20131)

packages/schema/src/config/experimental.ts

@@ -146,7 +146,7 @@ export default defineUntypedSchema({
      *
      * This can be disabled for most Nuxt sites to reduce the client-side bundle by ~0.5kb.
      */
-    polyfillVueUseHead: true,
+    polyfillVueUseHead: false,
 
     /** Allow disabling Nuxt SSR responses by setting the `x-nuxt-no-ssr` header. */
     respectNoSSRHeader: false,

test/bundle.test.ts

@@ -40,7 +40,7 @@ describe.skipIf(isWindows || process.env.ECOSYSTEM_CI)('minimal nuxt application
 
   it('default server bundle size', async () => {
     stats.server = await analyzeSizes(['**/*.mjs', '!node_modules'], serverDir)
-    expect(roundToKilobytes(stats.server.totalBytes)).toMatchInlineSnapshot('"92k"')
+    expect(roundToKilobytes(stats.server.totalBytes)).toMatchInlineSnapshot('"91k"')
 
     const modules = await analyzeSizes('node_modules/**/*', serverDir)
     expect(roundToKilobytes(modules.totalBytes)).toMatchInlineSnapshot('"2648k"')

test/fixtures/basic/nuxt.config.ts

@@ -190,6 +190,7 @@ export default defineNuxtConfig({
     }
   },
   experimental: {
+    polyfillVueUseHead: true,
     renderJsonPayloads: true,
     respectNoSSRHeader: true,
     clientFallback: true,