chore pkg and demo

packages/core/tsup.config.ts

@@ -0,0 +1,14 @@
+import { defineConfig, Options } from "tsup";
+
+export default defineConfig((options: Options) => ({
+  entry: ["src/index.ts"],
+  banner: {
+    js: "'use client'",
+  },
+  format: ["cjs", "esm"],
+  dts: true,
+  clean: true,
+  external: ["react"],
+  injectStyle: true,
+  ...options,
+}));