Upgrade rolldown and disable chunkOptimization

this works around the rolldown bug, and allows us to upgrade

Author: lazka

activity-showcase/rollup.config.js

@@ -83,6 +83,10 @@ export default (async () => {
             cleanDir: true,
         },
         preserveEntrySignatures: false,
+        experimental: {
+            // https://github.com/rolldown/rolldown/issues/8027#issuecomment-3834034108
+            chunkOptimization: false,
+        },
         // external: ['zlib', 'http', 'fs', 'https', 'url'],
         onwarn: function (warning, warn) {
             // ignore "suggestions" warning re "use strict"