chore(share): enable code splitting

packages/share-theme/scripts/build.ts

@@ -1,4 +1,3 @@
-import fs from "node:fs";
 import path from "node:path";
 // import {fileURLToPath} from "node:url";
 
@@ -51,8 +50,9 @@ async function runBuild() {
     await esbuild.build({
         entryPoints: entryPoints,
         bundle: true,
+        splitting: true,
         outdir: path.join(rootDir, "dist"),
-        format: "cjs",
+        format: "esm",
         target: ["chrome96"],
         loader: {
             ".png": "dataurl",