fix: enable code spliting for app

app/esbuild.config.js

@@ -0,0 +1,11 @@
+const __is_prod__ = process.env.NODE_ENV === 'production';
+require('esbuild').build({
+	entryPoints: ['src/index.tsx'],
+	chunkNames: '[name]-[hash]',
+	bundle: true,
+	minify: __is_prod__,
+	outdir: 'build',
+	splitting: true,
+	format: 'esm',
+	watch: !__is_prod__,
+});